Home

59551A GPS Measurements Synchronization

1. AVG LAT N 37 19 34 937 AVG LON W 121 59 50 457 ELEV MASK 10 deg AVG HGT 67 94 m GPS HEALTH MONI OK Self Test OK Int Pwr OK OCXO OK EFC OK GPS Rev OK Figure 3 3 Receiver Status Screen at Powerup The ACQUISITION area of the screen is telling you that no satellites have been tracked The identification numbers of several satellites appear in the Not Tracking column The asterisk next to the satellite identification number or pseudorandom noise code PRN indicates the Receiver is attempting to track it The current time and date are shown in the Time quadrant of the ACQUISITION area The default power up setting indicated by is corrected when the first satellite is tracked Since the Receiver is not tracking any satellites the GPS 1 PPS reference signal is invalid An accurate position is necessary to derive precise time from GPS The Position quadrant indicates that the Receiver is in survey mode which uses GPS to determine the position of the GPS antenna This process has not yet started since position calculations can be performed only while tracking four or more satellites INIT LAT INIT LON and INIT HGT are the initial estimate of the true position These coordinates are refined by the survey process The Receiver uses this position and the time of day to select satellites to track Therefore you can reduce satellite acquisition time by specifying an close approximation of position and ti
2. Binary Weights Questionable pe a 1 8 B56 0 Time Reset HG 4 1 2 9 512 1 User reported 4 op 2 4 10 1024 Alarm 3 8 11 2048 46 12 4096 Command Error notused o 6 64 14 16384 ee OR 71818 Saree ats 2 su OR Questionable Summary f AS ry a Ta not used R9 Alarm 3 Hardware Firmware Error 1 7 ra 4 Semantic Emon fon TENE 5 Syntactic Error we Master Summary Operation Summary 2 Power Cycled et NI Powerup First Satellite Tracked OR Operation Oscillator Oven Warm 4 Powerup Summary Date amp Time Valid Holdover Summary TOR Position Hold ee Ca Holdover T PPS Reference Vaida A Holding os OR Hardware Summary Waiting to Recover Log Almost Full Recovering Exceeding Threshold ono Hardware Selftest Failure 15V Supply Exceeds Tolerance 15V Supply Exceeds Tolerance 5V Supply Exceeds Tolerance Oven Supply Exceeds Tolerance not used EFC Voltage Near Full Scale EFC Voltage Full Scale GPS 1 PPS Failure GPS Failure TI Measurement Failed EEPROM Write Failed Internal Reference Failure Figure 5 1 59551A 58503A Status Reporting System DiagramMonitoring Shading identifies sul i mmary bit te Powerup Summary A Default Transition Filter 2 Default Event Enable A False to true positive Event enabled to report to transition latches event summary bit
3. Not applicable see Event disabled dll if gt gt gt gt gt gt gt gt gt The following describes for each functional group of operating status shown in Figure 5 1 each of the operating conditions that is monitored through the status alarm system Each monitored condition bit is set to one when the named condition is true and cleared to zero when the named condition is false Each monitored event bit is set when the named event has occurred and cleared at powerup and when the user executes a command which reads or clears the event register All of the conditions and events are cleared at powerup and SYSTem PRESet Alarm Status The Alarm Status summarizes condition changes from the three major functional status groups Questionable Command Error and Operation e The Questionable Summary condition bit 3 reflects one or more latched condition changes in the Questionable status group Command Reference 5 37 Command Reference e The Command Error Summary condition bit 5 reflects one or more latched condition changes in the Command Error status group The Master Summary condition bit 6 indicates that there was at least one reason for generating an Alarm The Operation Summary condition bit 7 reflects one or more latched condition changes in the Operation status group Operation Status The Operation Status is comprised of the Operation sub
4. not used 7 Operation Summary Figure 5 2 Alarm Condition and Enable Registers LED ALARm RESPONSE FORMAT Returns the status of the front panel Alarm LED Oori This query returns the status of the front panel Alarm LED which indicates that a change in operating conditions was recorded The alarm remains active even after the condition that caused it has gone away Command Reference 5 42 Command Reference Theory This query essentially reads the Master Summary bit bit 6 of theAlarm Condition Register At power up the alarm status is cleared SRE SYSTem PRESet Sets the Alarm Enable Register 136 ON VOLATILE The setting of the Alarm Enable Register Figure 5 2 selects which summary status from the Alarm Condition Register is enabled to generate an alarm Expanded Syntax SRE lt bit mask gt Semantics The lt bit mask gt has a range of 0 to 255 The lt bit mask gt value represents the sum of the binary weighted values of the register Attempts to set unused bits in the register are ignored the value of unused bits is zero SRE RESPONSE FORMAT Identifies the status conditions enabled to generate an alarm dd This query identifies the status conditions enabled to generate an alarm Reading the Alarm Enable Register identifies which summary status from the Alarm Condition Register is enabled to generate an alarm Response The range is 0 to 255 The response value repres
5. w oO 2 S STATus OPERation POWerup ENABIe NV STATus OPERation POWerup NTRansition NV STATus OPERation POWerup PTRansition NO sie S STATus OPERation PTRansition 27 NV STATus OPERation PTRansition S STATus QUEStionable CONDition USER STATus QUEStionable ENABle STATus QUEStionable NTRansition STATus QUEStionable PTRansition Q 2 2 NV NV NV NW O o eee S SYNChronization HOLDover DURation 0 0 Even if there was a prior holdover its duration will be lost SYNChronization HOLDover DURation THReshold 6400 that is 1 day NV SYNChronization STATe OWerup SYSTem ERRor i SYSTem LANGuage sol zl ig alg 2 3 AE lt 5 a Q oO 2 oO 2 NV stands for non volatile memory FEV stands for volatile memory Command Reference 5 88 Command Reference Receiver Identification Upgrade The commands provided in this section allow you to query the identification of the Receiver and to perform firmware upgrades in the field after you obtain a new firmware disk E Reading Product Identification IDN E Installing Firmware via I O PORT 1 CLS DIAGnostic DOWNload DIAGnostic ERASe DIAGnostic ERASe SYSTem ERRor SYSTem LANGuage SYSTem LANGuage Reading Product Identification IDN RESPONSE FORMAT Returns the Receiver identification ASCII Data This query returns the Receiv
6. Command Syntax and Style B 11 Command Syntax and Style Command Types Format and Elements Table B 3 Response Formats Continued Format Description XYZ ASCll encoded bytes corresponding to the literal used as the command parameter An example of an alphanumeric response is NONE XYZ A string response consists of ASCII characters enclosed by double quotes For example string data is used for the lt error description gt portion of SYST ERR response XYZ A list of string responses consist of comma separated ASCII characters enclosed by double quotes e g log 224 19951017 00 00 26 30 Holdover started GPS log 225 19951017 00 00 29 02 GPS lock started ASCII Data A sequence of ASCll encoded bytes Binary Data The syntax is a pound sign followed by a non zero digit representing the number of digits in the subsequent decimal integer The decimal integer specifies the number of 8 bit data bytes being sent This is followed by the actual data The terminator is a line feed For example for transmitting 8 bytes of data the format might be Number of digits that follow Actual data Terminator ew 208 lt 8 bytes of data gt lt carriage return gt lt new line gt Nuiiber st bytes to be transmitted The 2 indicates the number of digits that follow and the two digits O8 indicate the number of data bytes to be transmitted lt carriage return gt is defined as a single AS
7. Suspended track lt 4 sats Four or more satellites must be tracked to determine position Suspended poor geometry DOP dilution of precision is too large for an accurate pseudo range measurement Specifying an approximate initial INIT position will reduce satellite acquisition time Command Quick Reference Command Quick Reference Chapter Contents Chapter Contents This chapter is a quick reference that summarizes the GPS Receiver commands which allow you to operate and program the Receiver This chapter is organized as follows An Introduction to the GPS Receiver Commands page 4 4 SCPI Conformance Information page 4 4 Command Syntax Conventions page 4 4 Command Presentation page 4 4 GPS Satellite Acquisition page 4 4 Facilitating Initial Tracking page 4 4 Establishing Position page 4 5 Selecting Satellites page 4 6 Compensating for Antenna Delay page 4 6 Monitoring Acquisition page 4 6 1 PPS Reference Synchronization page 4 7 Monitoring 1 PPS Synchronization page 4 7 Assessing PPS Quality page 4 7 Operating in Holdover page 4 7 Operating Status page 4 8 Receiver Operation at a Glance page 4 8 Reading the Error Queue page 4 8 Reading the Diagnostic Log page 4 29 Monitoring Status Alarm Conditions page 4 8 Assessing Receiver Health page 4 9 Command Quick Reference 4 2 Command Quick Reference Chapter Contents System Time page
8. LED HOLDover RESPONSE FORMAT Returns the state of the frontpanel Holdover LED Oori This query returns the state of the front panel Holdover LED The Receiver sets this indicator when in holdover operation Response A value of 0 indicates the LED is off A value of 1 indicates the LED is on Assessing 1 PPS Quality SYNChronization FFOMerit RESPONSE FORMAT Returns the Frequency Figure of Merit dd This query returns the Frequency Figure of Merit FFOM Use this query when you want to know the stability of the Receiver s 10 MHz output The 10 MHz output is controlled by the SmartClock s Phase Locked Loop PLL Thus the FFOM value is determined by monitoring the status of the PLL Response The following table lists and defines the FFOM values 0 thru 3 that could be returned FFOM Definition Value io PLL stabilized 10 MHz output within specification PLL stabilizing PLL unlocked holdover Initially the 10 MHz output will be within specifications However when in holdover the 10 MHz output will eventually drift out of specification PLL unlocked not in holdover Do not use the output Command Reference 5 23 Command Reference SYNChronization HOLDover TUNCertainty PREDicted RESPONSE FORMAT Returns an estimate of the time interval error that can be d dEe 0 or 1 expected for a one day holdover given the current state of SmartClock learning in the Receiver This query returns an
9. SENSe TSTamp1 EDGE RISing or FALLing SENSe TSTamp2 EDGE RISing or FALLing SENSe TSTamp3 EDGE RISing or FALLing Parameter The RISing parameter sets the time stamped edge as the rising edge e The FALLing parameter sets the time stamped edge as the falling edge 59551A SENSe TSTamp lt channel gt EDGE RESPONSE FORMAT Returns the polarity of the edges the Receiver will time stamp XYZ This query returns the polarity of the edges the Receiver will time stamp Response RIS indicates that the time stamped edge is the rising edge FALL indicates that the time stamped edge is the falling edge 59551A SENSe DATA CLEar Clears the data in the measurement buffer for all Time Tag EVENT inputs This command clears the data in the measurement buffer and clears the overflow counts for all Time Tag inputs Context Dependencies SYSTem PRESet clears the time stamp measurement buffers and overflow counts Command Reference 5 71 Command Reference Clearing Time Stamp Memory 59551A SENSe DATA CLEar Clears the data in the time stamp measurement buffer for the EVENT user specified Time Tag input This command clears the data in the time stamp measurement buffer for the user specified Time Tag input Use TSTamp 1 or TSTamp 2 or TSTamp 3 to select one input Expanded Syntax SENSe DATA CLEar TSTamp 1 or TSTamp 2 or TSTamp 3 Parameter TSTamp 1 clears the data in Time Tag 1 input buffer TSTamp 2 c
10. The 59551A has separate rear panel PORT 1 and front panel PORT 2 RS 232C serial interface ports The 58503A has only a rear panel PORT 1 RS 232C serial interface port The rear panel PORT 1 RS 232C serial interface port is the only port which can be used to upgrade the Receiver firmware therefore it is referred to as the PRIMARY port The 59551A s front panel PORT 2 RS 232C serial interface port is referred to as the SECONDARY port because it cannot be used to upgrade the Receiver firmware The operation and configuration of these ports are described in the following paragraphs More information is provided in the sections titled Connecting a Computer or Modem and Configuring the RS 232C Port s in this chapter on pages 2 5 and 2 9 respectively Either port allows you full communication with the Receiver This can be done by connecting any computer with an RS 232C serial interface and suitable terminal emulation software then sending the correct commands for transmitting or retrieving data PORT 1 Rear Panel This 25 pin female subminiature D DB 25 connector PORT 1 RS 232C Serial Interface Port located on the rear panel The pins used for PORT 1 RS 232C communication are described in Table 2 1 Manufacturing reserves the right to impose signals on other pins therefore your connection should be restricted to the pins described in Table 2 1 Serial Interface Capabilities 2 3 Serial Interface Capabilit
11. Serial Interface Communication The following commands are provided to allow you to configure the serial interface port s for instrument communications Configuring I O Port 1 R SYSTem COMMunicate R SYSTem COMMunicate SERial1 BAUD 1200 or 2400 or 9600 or 19200 RF SYSTem COMMunicate SERial1 BAUD R SYSTem COMMunicate SERial1 BITS 7 or8 RF SYSTem COMMunicate SERial1 BITS R SYSTem COMMunicate SERial1 FDUPlex ON or OFF RF SYSTem COMMunicate SERial1 FDUPlex R SYSTem COMMunicate SERial1 PACE XON or NONE RF SYSTem COMMunicate SERial1 PACE R SYSTem COMMunicate SERial1 PARity EVEN or ODD or NONE RF SYSTem COMMunicate SERial1 PARity R SYSTem COMMunicate SERial1 SBITs 1 or2 RF SYSTem COMMunicate SERial1 SBITs Configuring I O Port 2 59551A Only F SYSTem COMMunicate F SYSTem COMMunicate SERial2 BAUD 1200 or 2400 or 9600 or 19200 RF SYSTem COMMunicate SERial2 BAUD RF SYSTem COMMunicate SERial2 BITS F SYSTem COMMunicate SERial2 FDUPlex ON or OFF RF SYSTem COMMunicate SERial2 FDUPlex F SYSTem COMMunicate SERial2 PACE XON or NONE RF SYSTem COMMunicate SERial2 PACE F SYSTem COMMunicate SERial2 PARity EVEN or ODD or NONE or ONE RF SYSTem COMMunicate SERial2 PARity RF SYSTem COMMunicate SERial2 SBITs Recovering the Last Query Response DIAGnostic QUERy RESPonse R Accessible via Rear panel PORT 1 F Accessible via Front panel PORT 2 of the 59551A Command Quick Reference 4 13 Comman
12. Sets the baud rate of specified port Not affected ION VOLATILE This command sets the baud rate of the specified port Expanded Syntax SYSTem COMMunicate SERial1 BAUD 1200 or 2400 or 9600 or 19200 SYSTem COMMunicate SERial2 BAUD 1200 or 2400 or 9600 or 19200 Parameter The possible baud rate values that can be entered are 1200 2400 9600 or 19200 Context Dependencies The baud rate value is stored in non volatile memory It is unaffected by powerup and SYSTem PRESet SYSTem COMMunicate lt port gt PRESet sets the baud rate to 9600 which is the factory default value t Must be received via the specified I O port SYSTem COMMunicate lt port gt BAUD RISSHONSIE ORME Lat F Returns the baud rate of specified port dd This query returns the baud rate of specified port Expanded Syntax SYSTem COMMunicate SERial1 BAUD SYSTem COMMunicate SERial2 BAUD SYSTem COMMunicate SERial1 BITS SYSTem PRESet R Sets the data bits value of PORT 1 Bs ON VOLATILE This command sets the data bits of PORT 1 Command Reference 5 80 Command Reference Expanded Syntax SYSTem COMMunicate SERial1 BITS 7 or8 Parameter The possible data bits values that can be entered are 7 or 8 Context Dependencies The data bits value is stored in non volatile memory It is unaffected by powerup and SYSTem PRESet SYSTem COMMunicate SERial1 PRESet sets the data bits to 8 which is the factory default v
13. alarm relay 1 3 4 29 5 53 5 65 5 66 5 68 5 70 5 71 5 72 5 73 5 74 5 75 5 76 5 77 5 78 5 79 5 80 5 81 5 82 5 83 5 84 5 85 5 86 5 87 5 88 alarm setup 4 29 5 53 5 65 5 68 5 70 5 71 5 72 5 73 5 75 5 76 5 77 5 78 5 79 5 80 5 81 5 82 5 83 5 84 5 85 5 86 5 87 5 88 alarm status 5 68 alarm test 4 29 5 53 5 54 5 87 5 88 5 89 5 90 5 91 Alarm 58503A 1 3 antenna connection 1 3 3 4 5 30 antenna delay compensation 4 25 5 8 5 30 Command Index 3 Command Index antenna delay values 5 30 antenna input 1 3 antenna placement 1 3 3 4 4 25 5 8 5 30 antenna system 3 4 application SatSat 3 8 applying local time zone offset 5 97 ASCII Data 5 16 assessing 1 PPS quality 5 41 B baud 2 9 5 123 5 132 baud 5 124 baud rate 2 9 Belden 8267 cable 5 31 Binary Data 5 17 BINARY Data 5 115 BITE alarm 1 3 Boolean 5 8 C cable assemblies antenna 5 30 cable delay compensation 4 25 5 8 5 30 cables antenna 5 30 crossover 2 5 HP 24542G 2 8 HP 24542G interface 2 6 HP 24542U 2 8 HP 40242M interface 2 6 modem eliminator 2 5 null modem 2 5 clear 5 112 5 113 clear alarm 4 29 5 53 5 73 errors 4 29 5 53 5 57 5 137 clear alarm 4 29 5 53 clear errors 5 137 clear time stamp memory 5 110 comma 5 5 5 8 5 12 command abbreviated 5 7 common 5 4 Command Index 4 format 5 5 parameter 5 8 SCPI 5 4 syntax 5 3 5 7 ter
14. 5 38 5 39 5 40 5 41 5 42 5 43 5 44 5 45 5 46 5 47 5 48 1PPS 5 38 5 39 5 40 1PPS 4 27 4 32 5 38 5 39 5 40 5 41 5 42 5 43 5 44 5 45 5 46 5 47 5 48 5 98 alarm 4 27 programmable pulse 5 103 5 104 5 105 5 106 5 107 5 108 Programmable Pulse 4 34 synchronization 5 39 5 40 5 41 5 42 5 43 5 44 5 45 5 46 5 47 5 48 output pulse 4 34 5 103 5 104 5 105 5 106 5 107 5 108 output synchronization 4 27 outputs 1PPS 1 3 Alarm BITE 1 3 Alarm 58503A 1 3 IRIG B 1 3 Programmable Pulse 1 3 overview SatStat 3 3 Receiver Status Screen 3 3 P pace 2 9 5 126 5 127 5 132 pacing 5 132 parameter separator 5 8 General Index 10 parameter types 5 8 literal 5 8 string 5 8 Parameter types Boolean 5 8 parameters baud rate 2 9 parity 2 9 Software pacing 2 9 stop bits 2 9 parity 2 9 5 127 5 128 5 132 PCT 5 9 pin assignment PORT 1 2 4 PORT 2 2 4 polarity of IPPS output 4 32 5 98 polarity of edges IPPS 4 32 5 98 programmable pulse 4 34 time stamp 4 36 5 110 5 111 polarity of the edges time stamp 5 111 polarity programmable pulse 4 34 polarity time stamp 4 36 POR 1 1 3 PORT 1 2 6 4 38 5 132 factory default values 2 9 PORT 1 configuration 2 11 PORT 1 rear panel 2 3 PORT 2 1 2 4 38 5 132 factory default values 2 9 PORT 2 configuration 2 11 PORT 2 front panel 2 4 position 4 23 5 7
15. Response An example response is 10 which indicates that the accumlated leap second difference between the GPS time and UTC is 10 seconds Context Dependencies This query is not valid prior to the first lock following powerup see bit 2 of the Powerup Status Register or SYSTem PRESet Sending this query before the first lock will generate error 230 Theory The leap second value is initialized during the power on sequence by evaluating PTIMe LEAPsecond ACC GPS time UTC time In July 1994 the value was 10 seconds The value is automatically adjusted immediately following the occurrence of a leap second correction to the UTC time scale When a 1 leap second addition is made to the UTC time scale the extra second delays the arrival of midnight UTC causing PTIM LEAP ACC to increase by 1 second When a 1 leap second subtraction is made to the UTC time scale the missing second hastens the arrival of UTC midnight causing PTIM LEAP ACC to decrease by 1 second PTIMe LEAPsecond DATE RESPONSE FORMAT Returns the UTC calendar date of next leap second dd dd dd This query returns the UTC calendar date of next leap second The year month and day are returned Command Reference 5 62 Command Reference Response Three fields are separated by commas lt year gt lt month gt lt day gt The lt year gt range is 1994 to 2077 The lt month gt range is 1 to 12 The lt day gt range is 1 to 31
16. Returns the current 24 hour time suitable for display Xyz This query returns the current 24 hour time suitable for display for example 15 23 06 Context Dependencies This query is not valid prior to the first lock following powerup see bit 2 of the Powerup Status Register or SYSTem PRESet Sending this query before the first lock will generate error 230 Command Reference 5 59 Command Reference Applying Local Time Zone Offset PTIMe TZONe SYSTem PRESet Sets the time zone local time offset to provide an offset from 0 0 UTC to serve as the basis for all reported time ON VOLATILE This command sets the time zone local time offset to provide an offset from Universal Coordinated Time UTC to serve as the basis for all reported time The local 24 hour time and local calendar date depend on the present setting of the time zone parameter which is used to indicate the offset from UTC Typical application of this command is to account for time zone differences between the installed Receiver location and the prime meridian at Greenwich which uses UTC uncorrected Expanded Syntax PTIMe TZONe lt hour gt lt minutes gt Parameter The lt hour gt range is 12 to 12 and is rounded to the nearest integer The optionally supplied lt minute gt range 59 to 59 and is rounded to the nearest integer The lt minute gt is defaulted to 0 if not supplied Context Dependencies SYSTem PRESet sets
17. SYSTem COMMunicate lt port gt SBITs Recovering the Last Query Response DIAGnostic QUERy RESPonse Receiver Initialization R SYSTem COMMunicate SER ial1 PRESet SYSTem COMMunicate SERial2 PRESet SYSTem PRESet Receiver Identification U pgrade Reading Product Identification IDN Installing Firmware via I O Port 1 CLS DIAGnostic DOWNload lt Motorola S record gt DIAGnostic ERASe DIAGnostic ERASe SYSTem ERRor SYSTem LANGuage INSTALL or PRIMARY SYSTem LANGuage 59551A DDUDDIDAIADA Accessible vi a R Rear panel PORT 1 F Front panel PORT 2 of the 59551A tT Must be received via the specified I O port RF SYSTem COMMunicate lt port gt BAUD crates and settings Header Long and sho headers and parameters are listed with the short form portion shown in uppercase characters Although mnemonics are not case sensitive only the exact long forms and exact short forms are recognized Many commai query form A Parameter s Literal parameters are enumerated rt fonn mnemonics of settings that are represented by types or literal parameters requiring further explanation are denoted by type between angle brackets lt gt inds have a corresponding query is acommand header with a question mark appended Shading identifies basic commands ee that access key receiver functions mnemonics e g ON Non literal data syntactic elements
18. SYSTem PRESet STATus lt register gt PTRansition SOROS REE ransition Filter identification ON VOLATILE Sets the specified transition filter registers The setting of the transition filter registers selects which condition transitions positive negative either or neither are enabled to report events Expanded Syntax STATus OPERation NTRansition lt bit mask gt STATus QUEStionable NTRansition lt bit mask gt STATus OPERation HARDware NTRansition lt bit mask gt STATus OPERation HOLDover NTRansition lt bit mask gt STATus OPERation POWerup NTRansition lt bit mask gt STATus OPERation PTRansition lt bit mask gt STATus QUEStionable PTRansition lt bit mask gt STATus OPERation HARDware PTRansition lt bit mask gt STATus OPERation HOLDover PTRansition lt bit mask gt STATus OPERation POWerup PTRansition lt bit mask gt Parameter The lt bit mask gt has a range of 0 to 65535 The lt bit mask gt value represents the sum of the binary weighted values of the register Attempts to set unused bits in the transition filter are ignored the value of unused bits is zero To enable negative one to zero transitions of specific conditions set the corresponding bits to one in the lt bit mask gt for the NTRansition register command To enable positive zero to one transitions of specific conditions set the corresponding bits to one in the lt bit mask gt for the PTRansition register comman
19. s firmware and to install a new firmware revision It should be selected only when firmware installation is required The INSTALL language offers the limited number of commands and queries which are documented in this section This set is designed to provide the Receiver status and control capability required during firmware upgrade NOTE The SatStat program provides a Service menu which automates firmware installation CLS Clears errors EVENT This command clears errors DIAGnostic DOWNload Sends down a Motorola S record EVENT Command Reference 5 90 Command Reference This command sends down a Motorola S record Expanded Syntax DIAGnostic DOWNload lt Motorola S record gt DIAGnostic ERASe Erases the flash EEPROM EVENT This command erases the flash EEPROM It should ONLY be sent to the Receiver as a preparatory step during firmware upgrade Erasing flash EEPROM will disable the instrument until flash EEPROM is reloaded with factory supplied instrument firmware DIAGnostic ERASe RESPONSE FORMAT Verifies flash EEPROM has been erased Oori This query verifies the flash EEPROM has been erased Response A value of 1 indicates that flash EEPROM has been erased This condition normally occurs when the instrument software in flash EEPROM is erased in preparation for installation of a more recent software revision That is after command DIAG ERASe has been issued and erase is complete the DIAG E
20. 1 3 1PPS error estimation 5 42 1PPS output 1 3 5 38 1PPS output quality 4 27 4 32 5 38 5 39 5 40 5 41 5 42 5 43 5 44 5 45 5 46 5 47 5 48 1PPS polarity 4 32 5 98 1PPS reference synchronization 4 27 5 38 A abbreviated commands 5 7 ac power 1 3 accessing the Receiver Status Screen 3 8 acquisition satellite 4 23 5 7 acquisition of satellites General Index 3 General Index 4 25 5 8 alarm analysis 4 29 5 53 5 54 5 65 5 66 5 68 5 70 5 71 5 72 5 73 5 74 5 75 5 76 5 77 5 78 5 79 5 80 5 81 5 82 5 83 5 84 5 85 5 86 5 87 5 88 alarm BITE 4 29 5 53 5 65 5 68 5 70 5 71 5 72 5 73 5 75 5 76 5 77 5 78 5 79 5 80 5 81 5 82 5 83 5 84 5 85 5 86 5 87 5 88 Alarm BITE 59551A 1 3 alarm clear 4 29 5 53 5 73 5 74 5 75 5 76 5 77 Alarm indicator 1 2 1 3 1 2 4 29 5 53 5 75 alarm relay 1 3 4 29 5 53 5 65 5 66 5 68 5 70 5 71 5 72 5 73 5 74 5 75 5 76 5 77 5 78 5 79 5 80 5 81 5 82 5 83 5 84 5 85 5 86 5 87 5 88 alarm setup 4 29 5 53 5 65 5 68 5 70 5 71 5 72 5 73 5 75 5 76 5 77 5 78 5 79 5 80 5 81 5 82 5 83 5 84 5 85 5 86 5 87 5 88 alarm status 5 68 alarm test 4 29 5 53 5 54 5 87 5 88 5 89 5 90 5 91 Alarm 58503A 1 3 antenna connection 1 3 3 4 5 30 antenna delay compensation 4 25 5 8 General Index 4 5 30 antenna delay values 5 30 antenna input 1 3 antenna pla
21. 2 Both Receivers have the rear panel RS 232C serial interface port PORT 1 The 59551A has an additional front panel RS 232C serial interface port PORT 2 The following commands are provided to allow you to configure the ports E Configuring I O Port 1 lt port gt SERial1 or SERial Configuring I O Port 2 lt port gt SERial2 59551A Only SYSTem COMMunicate SYSTem COMMunicate lt port gt BAUD SYSTem COMMunicate lt port gt BAUD SYSTem COMMunicate SERial1 BITS SYSTem COMMunicate lt port gt BITS SYSTem COMMunicate lt port gt FDUPlex SYSTem COMMunicate lt port gt FDUPlex SYSTem COMMunicate lt port gt PACE SYSTem COMMunicate lt port gt PACE SYSTem COMMunicate lt port gt PARity SYSTem COMMunicate lt port gt PARity SYSTem COMMunicate SERial1 SBITs SYSTem COMMunicate lt port gt SBITs E Recovering the Last Query Response DIAGnostic QUERy RESPonse Configuring I O Ports SYSTem COMMunicate ESSTLOINISTE RO RLWAT Identifies which serial port is being used XYZ This query identifies which serial port is being used Use this query when the Receiver is installed out of sight or at a remote location The distinction between SERIALI1 and SERIAL2 is required in communication commands for setting parameters such as baud and parity Command Reference 5 79 Command Reference Response SER1 or SER2 is returned SYSTem COMMunicate lt port gt BAUD EU aa Sma a
22. 3 59551A interface port PORT 1 1 3 PORT 2 1 2 59551A outputs 1PPS 1 3 Alarm BITE 1 3 IRIG B 1 3 Programmable Pulse 1 3 SatStat 3 3 3 8 3 9 3 10 5 3 58506A antenna cable assembly 5 30 58507A antenna cable assembly 5 30 58508A antenna cable assembly 5 30 58511A antenna cable assembly 5 30 HZ 5 9 I T O Port 1 4 38 identification of Receiver 4 42 5 136 IEEE 488 2 description 5 4 IEEE Standard 488 2 obtaining copy of standard General Index 8 5 18 TEEE488 2 syntax 5 5 In This Guide 0 3 ix indicator Alarm 1 3 indicators Alarm 1 2 GPS Lock 1 2 Holdover 1 2 Power 1 2 initialization 5 131 initialize 4 40 initializing the Receiver 4 40 initiating manual Holdover 5 38 5 49 input antenna 3 4 4 25 5 8 5 30 Time Tag 4 36 input power 1 3 inputs antenna 1 3 time tag 1 3 install firmware 2 3 5 135 INSTALL 5 140 INSTALL language 5 137 installation 4 42 5 9 5 23 installing firmware 5 137 installing firmware via I O Port 1 4 42 installing firmware via I O PORT 1 5 135 5 137 installing SatStat 3 8 installing the SatStat 3 8 interface RS 232C 2 3 interface port PORT 1 1 3 PORT 2 1 2 internal reference oscillator General Index 5 7 5 38 internal self test diagnostics 5 89 Interpolators 5 89 introduction commands 4 22 IRIG B connector 1 3 IRIG B output 1 3 J jack power power 1 3 K keywo
23. 33 Command Reference Context Dependencies This command is always valid If the optional log count parameter is sent and the current and actual log count does not match log count value the clear will not be performed and error 222 will be generated DIAGnostic LOG COUNt RESPONSE FORMAT Identifies the number of entries in the diagnostic log dd This query identifies the number of entries in the diagnostic log Response Range is 1 to 222 maximum is subject to change DIAGnostic LOG READ RESPONSE FORMAT Returns the most recent diagnostic log entry xyz This query returns the most recent diagnostic log entry Response The diagnostic log entry format is Log NNN YYYYMMDD HH MM SS lt log_message gt where Log indicates a diagnostic log entry and NNN is the log entry number YYYYMMDD HH MM SS is the date and time of the diagnostic log entry The lt log_message gt is a sequence of up to 255 characters DIAGnostic LOG READ RESPONSE FORMAT Returns the user specified diagnostic log entry Returns the XYZ most recent diagnostic log entry if no parameter is supplied This query returns the user specified diagnostic log entry Expanded Syntax DIAGnostic _LOG READ lt entry number gt Parameter Range is 1 to current log count Response The diagnostic log entry format is Log NNN YYYYMMDD HH MM SS lt log_message gt where Command Reference 5 34 Command Reference Log indi
24. 5 13 5 15 5 17 5 18 5 19 5 20 position at powerup 5 21 5 22 General Index position hold 5 19 power ac 1 3 dc 1 3 Power indicator 1 2 Power input 1 3 power outages 5 110 Power supply levels 5 89 power surges 5 110 powering up the Receiver 3 7 powerup status 5 71 Powerup status 5 65 predicted visible satellites 5 35 preface 0 3 1x preset 4 40 5 131 preset to factory defaults 2 9 4 40 5 131 5 132 product identification 4 42 5 136 program SatSat 3 8 program messages definition 5 10 syntax 5 10 programmable pulse 4 34 5 103 5 104 5 105 5 106 5 107 5 108 Programmable Pulse connector 1 3 Programmable Pulse output 1 3 pulse generator 4 34 5 103 5 104 5 105 5 106 5 107 5 108 pulse output 4 34 5 103 5 104 5 105 5 106 5 107 5 108 pulse per second 1 3 pulse polarity 4 34 Q QSPI 5 89 query 5 8 5 11 query error 5 6 query parameters lt numeric value gt 5 8 MAXimum 5 8 MINimum 5 8 querying instrument identification 5 135 questionable status 5 71 Questionable status 5 65 queue overflows 5 3 queue error 4 29 5 53 5 139 quick reference command list 4 2 factory instrument settings 5 133 factory serial port settings 5 132 R RAM 5 89 reading leap second status 5 99 rear panel PORT 1 2 3 Receiver Commands at a Glance 4 2 Receiver identification 4 42 5 135 5 136 Receiver initializa
25. Command Reference O Reading and Qualifying Command Error Status Command Error Event Register not used not used Query Error Hardware Firmware Error Semantic Error Syntactic Error ESR ak wh not used Power Cycled NI command Error SOR Command Error k Summary Bit of Register Alarm Condition Register not used not used Query Error Hardware Firmware Error Semantic Error Syntactic Error not used Power Cycled ESE lt bit mask gt ESE ak WP N Figure 5 4 Command Error Event and Enable Registers LESEN SYSTem PRESet Sets the Command Error Enable Register 0 ION VOLATILE The setting of the Command Error Enable Register Figure 5 4 selects which events from the Command Error Event Register are enabled to report to the Command Error Summary bit of the Alarm Condition Register Expanded Syntax ESE lt bit mask gt Parameter The lt bit mask gt has a range of 0 to 255 The lt bit mask gt value represents the sum of the binary weighted values of the register Attempts to set unused bits in the register are ignored the value of unused bits is zero Command Reference 5 50 Command Reference ESE RESPONSE FORMAT Reads the Command Error Enable Register dd This query identifies the status conditions enabled to generate an alarm Reading the Command Error Enable Register Figure 5 4 identifies which events from the C
26. Command Types Format and Elements Command Terminator A command may be terminated with a line feed ASCII LF character 10 decimal a carriage return ASCII CR character 13 decimal or one followed immediately by the other in any order Using Multiple Commands Program Messages Program Messages are a combination of one or more properly formatted SCPI Commands Program messages always go from the DTE to the Receiver They are sent to the Receiver over the Receiver s serial interface as a sequence of ASCII characters Program Message Syntax Figure B 3 shows the simplified syntax of a program message You can see Common Commands and Subsystem Commands in the same program message If you send more than one command in one message you must separate adjacent commands with a semicolon Subsystem Command NOTE lt new line gt ASCII character decimal 10 lt carriage return gt ASCII character decimal 13 Figure B 3 Simplified Program Message Syntax Diagram When using IEEE 488 2 Common commands with SCPI Subsystem commands on the same line use a semicolon between adjacent commands For example CLS SYST ERR Command Syntax and Style B 8 Command Syntax and Style Command Types Format and Elements When multiple SCPI Subsystem commands are sent in one program message the first command is always referenced to the root node 6699 Subsequent commands separated by are referenced to the sam
27. Context Dependencies This query is not valid prior to the first lock following powerup see bit 2 of the Powerup Status Register or SYSTem PRESet or if no leap second is pending Sending this query before the first lock or if no leap second is pending will generate error 230 PTIMe LEAPsecond DURation RESPONSE FORMAT Returns the duration of the minute corrected by the next leap dd second This query identifies whether a leap second is pending distinguishes between leap seconds which extend the minute and leap seconds which shorten the minute This query returns the duration of the minute corrected by the next leap second The duration units are seconds Response Returns a value of 59 60 or 61 A value of 59 indicates subtraction of 1 second is pending e A value of 60 indicates no leap second pending A value of 61 indicates addition of 1 second is pending Context Dependencies This query is not valid prior to the first lock following powerup see bit 2 of the Powerup Status Register or SYSTem PRESet or if no leap second is pending Sending this query before the first lock or if no leap second is pending will generate error 230 PTIMe LEAPsecond STATe RESPONSE FORMAT Identifies if leap second is pending Oor1 Command Reference 5 63 Command Reference This query identifies if a leap second is pending This query looks ahead to indicate a pending leap second Response A value of 0 indicates no
28. HOLDover RECovery LIMit IGNore Initiates recovery from holdover if recovery was inhibited by EVENT time intervals exceeding limit This command initiates recovery from holdover if recovery was inhibited by time intervals exceeding limit The time interval used for this comparison is the time interval between the internal oscillator s 1 PPS edge and the GPS system s 1 PPS edge When this time interval consistently exceeds the specified limit the instrument enters the holdover state Waiting to Recover Recovery is initiated when the time intervals consistently fall within limits or when the limit is ignored by issuing this command SYNChronization IMMediate Initiates a near instantaneous alignment of the GPS 1 PPS and EVENT Receiver output 1 PPS if the command is issued during recovery from holdover This command initiates a near instantaneous alignment of the GPS 1 PPS and Receiver output 1 PPS if the command is issued during recovery from holdover Context Dependencies This command is only valid when recovering from holdover See bit 2 of the Holdover Status Register if it is 1 this command is okay Sending this command when the Receiver is not recovering will generate error 221 Command Reference 5 28 Command Reference Operating Status This section describes the commands that can be use to obtain Receiver status information There are several ways to obtain Receiver status using commands For example you can
29. Last diagnostic check of the miscroprocessor system reference manually initiated oscillator satellite receiver and power supplies failed User initiated holdover Int Pwr Holdover Duration is the cumulative duration of holdover and Internal power supply voltage s exceeds tolerance recovery operations Oven Pwr Power up Oscillator oven power supply voltage exceeds tolerance Warm up initial adjustment of the oscillator OcxO i Oscillator output failed EFC l FRN Oscillator control voltage is at or near full scale Reference Outputs GPS Rev Measures of signal quality Satellite receiver communication failed or GPS 1PPS reference Hl TFOM Time Figure of Merit is absent Accuracy of the 1PPS reference A number between 0 best and 9 that denotes a timing error of 107FOM 1 to 10TFOM nanoseconds Az Hold rtaint FFOM Frequency Figure of Merit a oust Unce an y Frequency stability of the 10 MHz reference Estimations of timing accuracy while in holdover mode which CN 0 Stable signal within specification reflect the extent to which SmartClock has learned the 1 Stabilizing this signal oscillator s characteristics 2 Holdover mode frequency will drift Predict g 3 Signal is unusable Maximum timing error that can be expected over the initial 1PPS TI Time Interval 24 hours of holdover operation mon Average phase difference between the GPS reference and Present oscillator 1PPS signals Maximum timing
30. PC match the Receiver When you are successful you will have restored full RS 232C communications enabling you to query the Receiver s communication settings Once you establish communications with one serial port you can query the Receiver for settings of either port Issue the following queries to either serial port to verify PORT 1 s configuration SYST COMM SER PACE SYST COMM SER BAUD SYST COMM SER PARITY SYST COMM SER BITS SYST COMM SER SBITS Issue the following queries to either serial port to verify PORT 2 s configuration SYST COMM SER2 PACE SYST COMM SER2 BAUD SYST COMM SER2 PARITY SYST COMM SER2 BITS SYST COMM SER2 SBITS Serial Interface Capabilities 2 11 Serial Interface Capabilities Serial Interface Capabilities 2 12 Visual User Interface Visual User Interface Chapter Contents This chapter is organized as follows Overview of the Visual User Interface Setting Up the GPS Receiver To Connect Antenna System to the Receiver To Connect PC to the Receiver To Power Up the Receiver Accessing the Receiver Status Screen the Visual User Interface To Access the Manually Operated Receiver Status Screen To Install the Automated SatStat Program for Continual Status Updates To Operate the Automated SatStat Program Using and Reading the Receiver Status Screen Tutorial on Using the Status Screen to Interface With the Receiver Demonstration of Holdover Oper
31. PPS Reference Synchronization page 5 21 Monitoring 1 PPS Synchronization page 5 22 Assessing 1 PPS Quality page 5 23 Operating in Holdover page 5 7 Operating Status page 5 8 Receiver Operation at a Glance page 5 30 Reading the Error Queue page 5 8 Reading the Diagnostic Log page 5 29 Monitoring Status Alarm Conditions page 5 36 Assessing Receiver Health page 5 9 Command Reference 5 2 Command Reference System Time page 5 10 Identifying Time of Next 1 PPS Reference Edge page 5 57 Reading Current Time page 5 10 Applying Local Time Zone Offset page 5 10 Defining the 1 PPS Reference Edge 59551A Only page 5 61 Reading Leap Second Status page 5 10 Programmable Pulse Output 59551A Only page 5 64 Event Time Stamping 59551A Only page 5 12 Defining the Time stamped Edge page 5 70 Clearing Time Stamp Memory page 5 72 Reading Time Stamps page 5 12 Processing Memory Overflows page 5 76 Serial Interface Communication page 5 79 Configuring I O Ports page 5 79 Recovering the Last Query Response page 5 13 Receiver Initialization page 5 14 e Receiver Identification Upgrade page 5 89 Reading Product Identification page 5 89 Installing Firmware via I O Port 1 page 5 15 See Appendix B Command Syntax and Style for details regarding command Expanded Syntax parameter types and query response types Command Syntax Conventions POSition Mean
32. Qualifying Command Error Status ESE ESE ESR O Reporting Questionable Status STATus QUEStionable CONDition USER STATus QUEStionable EVENt USER E Assessing Receiver Health TST DIAGnostic LIFetime COUNt DIAGnostic TEST DIAGnostic TEST RESult Receiver Operation at a Glance SYSTem STATus RESPONSE FORMAT Outputs a formatted status screen ASCII Data This query outputs a formatted Receiver Status screen Use this screen to monitor GPS acquisition derivation of time and position and synchronization of reference outputs to GPS Refer to Chapter 3 Visual User Interface for detailed information on the Receiver Status screen Response Sending this command will display a status screen similar to the following figure Command Reference 5 30 Command Reference SYSTem STATus LENGth RESPONSE FORMAT Returns the number of lines of formatted text that are in the dd Receiver Status screen This query returns the number of lines of formatted text that are in the Receiver Status screen Reading the Error Queue SYSTem ERRor RESPONSE FORMAT Returns the oldest error in the Error Queue and removes that dd XYZ error from the queue first in first out This query returns the oldest error in the Error Queue and removes that error from the queue first in first out See Appendix A Error Messages in this guide for detailed error information Response Th
33. SATellite TRACking IGNore lt PRN gt lt PRN gt Sends list of satellites to ignore GPS SATellite TRACking IGNore Returns list of satellites to ignore GPS SATellite TRACking INCLude lt PRN gt lt PRN gt GPS SATellite TRACking INCLude GPS SATellite TRACking lt select gt ALL GPS SATellite TRACking lt select gt COUNt GPS SATellite TRACking lt select gt NONE GPS SATellite TRACking lt select gt STATe lt PRN gt Compensating for Antenna Delay GPS REFerence ADELay lt seconds gt Sets the GPS antenna delay value in seconds GPS REFerence ADELay Returns the GPS antenna delay value in seconds Monitoring Acquisition GPS REFerence VALid Indicates whether the date and time are valid 1 valid GPS SATellite TRACking Returns a list of all satellites being tracked GPS SATellite VISible PREDicted Returns the list of satellites PRN that the almanac predicts should be visible given date time and position GPS SATellite TRACking COUNt GPS SATellite VISible PREDicted COUNt Command Quick Reference 4 6 Command Quick Reference 1 PPS Reference Synchronization 1 PPS Reference Synchronization The following commands are provided to monitor the operating mode of the reference oscillator to determine the accuracy and stability of the reference output signal s and to control the oscillator holdover process Monitoring 1 PPS Synchronization SY
34. an approximate date however reduces the time to initial GPS tracking by assisting the Receiver in finding satellites Expanded Syntax GPS INITial DATE lt four digit year gt lt month gt lt day gt Parameter Range the year month and day must be valid Context Dependencies This command is valid prior to first satellite tracked see bit 0 of the Operation Status Register Sending this command after this time will generate error 221 The initial date and time needs to be within 3 minutes of the actual date and time to be effective in enabling faster initial GPS acquisition GPS INITial POSition SYSTem PRESet Sets an approximate position for faster initial GPS acquisition Sa OLATILE This command sets an approximate position for faster initial GPS acquisition Following powerup the Receiver refines its position from the satellite data This process occurs automatically This command is most effective when the retained position differs significantly from the Receiver s true position Expanded Syntax GPS INITial POSition N orS lt latitude degree gt lt latitude minute gt lt latitude secona gt E orW lt ongitude degree gt lt longitude minute gt lt longitude second gt lt height above mean sea level in meters gt Parameter This command requires three position coordinates latitude longitude and height Position must be specified with respect to the World Geodetic System 1984 WGS 198
35. and resets This command has no effect on condition enable or transition filter registers STATus PRESet ALARm Presets the status alarm reporting system to generate an alarm EVENT when a factory default set of operating conditions occurs When the configurable portion of the status alarm reporting system is preset the Receiver is configured to generate an alarm under the factory default set of operating conditions Use this command to restore only the status alarm reporting system to the factory SYSTem PRESet settings Theory The configurable portion of the status alarm reporting system consists of enable and transition filter registers Figure 5 1 identifies the factory default enables and transitions Command Reference 5 41 Command Reference The status alarm reporting configuration is stored in non volatile memory This command performs a subset of the SYSTem PRESet command in that it only presets the configuration associated with status alarm reporting system This command does not affect condition or event registers O Reading and Qualifying Alarms Alarm Condition Register not used not used not used Questionable Summary not used Command Error Summary Master Summary Operation Summary STB Alarm Enable Register not used not used not used SRE lt bit mask gt 3 Questionable Summary SRE not used 5 Command Error Summary
36. and to monitor the acquisition E Facilitating Initial Tracking GPS INITial DATE GPS INITial POSition GPS INITial TIME E Establishing Position GPS POSition GPS POSition GPS POSition ACTual GPS POSition HOLD LAST GPS POSition HOLD STATe GPS POSition SURVey PROGress GPS POSition SURVey STATe GPS POSition SURVey STATe GPS POSition SURVey STATe POWerup GPS POSition SURVey STATe POWerup E Selecting Satellites GPS SATellite TRACking EMANgle GPS SATellite TRACking EMANgle GPS SATellite TRACking IGNore GPS SATellite TRACking IGNore GPS SATellite TRACking INCLude GPS SATellite TRACking INCLude GPS SATellite TRACking lt select gt COUNt GPS SATellite TRACking lt select gt STATe E Compensating for Antenna Dela GPS REFerence ADELay GPS REFerence ADELay E Monitoring Acquisition GPS REFerence VALid GPS SATellite TRACking GPS SATellite VISible PREDicted GPS SATellite TRACking COUNt GPS SATellite VISible PREDicted COUNt Command Reference 5 6 Command Reference Facilitating Initial Tracking GPS INITial DATE SYSTem PRESet Sets an approximate date for faster initial GPS acquisition Balas OLATILE This command sets an approximate date for faster initial GPS acquisition Following powerup the Receiver obtains the current date from satellite data This process occurs automatically Providing
37. any item in the lt PRN gt list is invalid the entire list will be rejected Error 222 will be generated Command Reference 5 14 Command Reference GPS SATellite TRACking INCLude RESPONSE FORMAT Returns a list of satellites to include dd This query returns a list of satellites to include for tracking Each satellite is identified by its pseudorandom noise code PRN Zero 0 indicates no satellites being included i e the satellites are still on the ignored list Context Dependencies This query is always valid GPS SATellite TRACking IGNore COUNt RESPONSE FORMAT Returns the number of satellites that are on the list to ignore for dd tracking GPS SATellite TRACKing INClude COUNt dd Returns the number of satellites that are on the list to include for tracking The query GPS SATellite TRACking IGNore COUNt returns the number of satellites that are on the list to ignore for tracking The query GPS SATellite TRACking INClude COUNt returns the number of satellites that are on the list to be included for tracking Response There may be some delay between changes made to the list of satellites being ignored and their actual removal and inclusion in the tracking process At SYSTem PRESet all satellites are put on the list to include for tracking GPS SATellite TRACking IGNore STATe RESPONSE FORMAT Returns the ignored status of individual satellites Oor1 GPS SATellite TRACking INClude STA
38. failed The literal or alphanumeric characters portion of the response identifies the specific test System Time The GPS Receiver is designed to allow you access to a very accurate system clock that provides both date and time to customize the clock for a local time zone to identify the exact time to identify the accumulated time difference in seconds between the GPS and UTC timelines and to monitor and adjust for leap second occurrences The following commands are provided to allow you to monitor and control the system date and time Command Reference 5 55 Command Reference E Identifying Time of Next 1 PPS Reference Edge PTIMe TCODe E Reading Current Time PTIMe DATE or SYSTem DATE PTIMe TIME or SYSTem TIME PTIMe TIME STRing E Applying Local Time Zone Offset PTIMe TZONe PTIMe TZONe E Defining the 1 PPS Reference Edge 59551A Only PTIMe PPS EDGE PTIMe PPS EDGE E Reading Leap Second Status PTIMe LEAPsecond ACCumulated PTIMe LEAPsecond DATE PTIMe LEAPsecond DURation PTIMe LEAPsecond STATe Command Reference 5 56 Command Reference Identifying Time of Next 1 PPS Reference Edge PTIMe TCODe RESPONSE FORMAT R Returns timecode message 980 to 20 ms prior to 1 PPS of ASCII Data indicated time This query returns timecode message 980 to 20 ms prior to 1 PPS of indicated time This special query provides not only accurate time but also provides the user the oppo
39. gt STATus lt register gt PTRansition Reading and Qualifying Command Error Status ESE lt bit mask gt ESE ESR Reporting Questionable Status STATus QUEStionable CONDition USER SET or CLEar STATus QUEStionable EVENt USER PTRansition or NTRansition D D D D Assessing Receiver Health TST DIAGnostic LIFetime COUNt DIAGnostic TEST ALL or lt spectic test gt 2 DIAGnostic TEST RESult Command Qu ick Reference Receiver Commands at a Glance Syste Identi Rae ea m Time fying Time of Next 1 PPS Reference Edge Me TCODe Reading Current Time IPT PT PT Apply PT PF Defining the 1 PPS Reference E dge PT PTI Me DATE or SYSTem DATE Me TIME or SYSTem TIME Me TIME STRing ing Local Time Zone Offset Me TZONe lt hours gt lt minutes gt Me TZONe 59551A Me PPS EDGE RISing or FALLing Me PPS EDGE Reading Leap Second Status PTIMe LEAPsecond ACCumulated PT PT PT Programmable Pulse Output PU PU PU PU PU PU PU PU PU Me LEAPsecond DATE Me LEAPsecond DURation Me LEAPsecond STATe 59551A LSe CONTinuous PERiod lt seconds gt LSe CONTinuous PERiod LSe CONTinuous STATe ON or OFF LSe CONTinuous STATe LSe REFerence EDGE RlSing or FALLing LSe REFerence EDGE LSe STARt DATE lt year gt lt month gt lt day gt LSe STARt DATE LSe STARt TIME lt hour gt lt minte gt lt second gt PU Event Ti
40. level or root keyword one or more lower level keywords and parameters The following example shows a command and its associated query GPS POSition SURVey STATe ONCE GPS POSition SURVey STATe GPS is a root level keyword with POSition the second level keyword SURVey the third level keyword and STATe the fourth level ONCE is the command parameter Command Syntax and Style B 3 Command Syntax and Style Command Types Format and Elements Elements of SCPI Commands A program command or query is composed of functional elements that include a header keywords with colon separators program data and terminators These elements are sent to the Receiver over the serial interface as a sequence of ASCII characters Examples of a typical Common Command and Subsystem Command are CLS SYST ERR Common Command Syntax Figure B 1 shows the simplified syntax of aCommon Command You must use a space SP between the command mnemonic and the parameter in a Common Command O mnemonic F sp parameter NOTE sp space ASCII character decimal 32 Figure B 1 Simplified Common Command Syntax Diagram Subsystem Command Syntax Figure B 2 shows the simplified syntax of a Subsystem Command You must use a space SP between the last command mnemonic and the first parameter in a Subsystem Command Note that if you send more than one parameter with a single command you must separate adjacent parameters with a comma parameter a su
41. local calendar date is always referenced to UTC time offset by any local time zone value that has been provided by the user The year month and day are returned Response Three fields are separated by commas lt year gt lt month gt lt day gt The lt year gt range is 1994 to 2077 e The lt month gt range is 1 to 12 The lt day gt range is 1 to 31 Context Dependencies This query is not valid prior to the first lock following powerup see bit 2 of the Powerup Status Register or SYSTem PRESet Sending this query before the first lock will generate error 230 PTIMe TIME RESPONSE FORMAT SYSTem TIME Returns the current 24 hour time tdd dd tdd This query returns the current 24 hour time The local time is always referenced to UTC time offset by any local time zone value that has been provided by the user The hour minute and second is returned Command Reference 5 58 Command Reference Response Three fields are separated by commas lt hour gt lt minute gt lt second gt e The lt hour gt range is 0 to 23 e The lt minute gt range is 0 to 59 The lt second gt range is 0 to 60 The value of 60 only occurs as the UTC leapsecond Context Dependencies This query is not valid prior to the first lock following powerup see bit 2 of the Powerup Status Register or SYSTem PRESet Sending this query before the first lock will generate error 230 PTIMe TIME STRing RESPONSE FORMAT
42. query identifies whether the Receiver is in survey or position hold mode In survey mode the Receiver continually refines its position In position hold mode the position does not change Response A response of ONCE indicates that the Receiver is in survey mode A response of 0 indicates the Receiver is in position hold mode GPS POSition SURVey STATe POWerup SYSTem PRESet Selects position mode to be used at powerup ON ION VOLATILE This command specifies whether the Receiver always surveys at powerup or restores its last position at powerup Expanded Syntax GPS POSition SURVey STATe POWerup ON or OFF Parameter OFF sets the Receiver to powerup in the last valid position ON sets the Receiver to survey on powerup GPS POSition SURVey STATe POWerup RESPONSE FORMAT Returns the position mode to be used at powerup Oori This query returns the position mode to be used at powerup Response A value of 0 indicates the Receiver is set to powerup in the last valid position A value of 1 indicates the Receiver is set to survey on powerup Command Reference 5 12 Command Reference Selecting Satellites GPS SATellite TRACKing EMANgle SYSTem PRESet Sets the GPS elevation mask angle value in degrees 10 ION VOLATILE This command instructs the Receiver to allow tracking those satellites for which the elevation angle is greater than this elevation mask angle Satellites below this elevation are visible b
43. returns multiple values a comma is used to separate each item When multiple queries are sent in the same program message the groups of data corresponding to each query are separated by a semicolon lt carriage return gt lt new line gt response data NOTE lt new line gt ASCII character decimal 10 lt carriage return gt ASCII character decimal 13 multiple response separator ASCII character decimal 59 data separator within a response ASCII character decimal 44 Figure B 4 Simplified Response Message Syntax Diagram Command Syntax and Style B 10 Command Syntax and Style Command Types Format and Elements Response Formats Table B 3 contains explanations of response formats Table B 3 Response Formats tdd This numeric format represents an integer e g 9 The maximum number of characters in dd response data is 17 maximum 16 digits 1 sign tdd This numeric format represents a comma separated list of integers g 1 2 3 This numeric format represents a fixed e g 10 5 t d dEe The maximum number of characters in d dEe response data is 13 maximum 6 mantissa digits 2 signs 1 decimal point 1 E character 3 exponent digits This numeric format represents comma separated list of floating numbers g 1 00000E 009 2 00000E 009 5 00000E 009 Oori A single ASCll encoded byte 0 or 1 is returned for the query of settings that use ON OFF 1 or O parameters
44. send a command to display the Receiver Status screen to read the error queue and to read the diagnostic log You can also send a sequence of commands to read and control the status registers for alarm generation This section defines all of the commands used for status reporting A comprehensive discussion on how you can monitor and control alarm conditions using the the status registers is included E Receiver Operation at a Glance SYSTem STATus SYSTem STATus LENGth E Reading the Error Queue SYSTem ERRor E Reading the Diagnostic Log DIAGnostic _LOG CLEar DIAGnostic _LOG READ ALL DIAGnostic LOG CLEar DIAGnostic LOG COUNt DIAGnostic LOG READ DIAGnostic LOG READ E Monitoring Status Alarm Conditions O Clearing and Presetting Alarms CLS STATus PRESet ALARm O Reading and Qualifying Alarms LED ALARm SRE SRE STB Command Reference 5 29 Command Reference O Reading and Qualifying Receiver Status lt register gt OPERation lt register gt QUEStionable lt register gt OPERation HARDware lt register gt OPERation HOLDover lt register gt OPERation POWerup STATus lt register gt CONDition STATus lt register gt EVENt STATus lt register gt ENABle STATus lt register gt ENABle STATus lt register gt NTRansition STATus lt register gt NTRansition STATus lt register gt PTRansition STATus lt register gt PTRansition O Reading and
45. stop PULSe CONTinuous PERiod lt seconds gt Sets the interval between pulses in seconds PULSe CONTinuous PERiod Returns the interval between pulses in seconds PULSe CONTinuous STATe ON or OFF Selects whether the Programmable Pulse output will be just one pulse or a sequence of pulses PULSe CONTinuous STATe Identifies whether the Programmable Pulse output is set to output a single pulse or sequence of pulses PULSe REFerence EDGE RlSing or FALLing Selects the polarity of the Programmable Pulse on time edge PULSe REFerence EDGE Returns the polarity of the Programmable Pulse on time edge PULSe STARt DATE lt four digit year gt lt month gt lt day gt Sets the date when the individual pulse or first pulse of the pulse sequence is to be generated at the Programmable Pulse output PULSe STARt DATE Returns the date when the individual pulse or first pulse of the pulse sequence is generated at the Programmable Pulse output PULSe STARt TIME lt hour gt lt minute gt lt second gt Sets the time when the individual pulse or first pulse of the pulse sequence is to be generated at the Programmable Pulse output PULSe STARt TIME Returns the time when the individual pulse or first pulse of the pulse sequence is generated at the Programmable Pulse output Command Quick Reference 4 11 Command Quick Reference Event Time Stamping 59551A Only Event Time Stamping 59551A Only The following
46. the PC There could also be an E xxx gt prompt if a pre existing error has occurred If the Alarm indicator lights a failure may have occurred during the self test Refer to the section titled Operating Status in Chapter 5 Command Reference of the Operating and Programming guide for a complete description of the Alarm capability d The Receiver begins to search the sky for all available satellites Accessing the Receiver Status Screen the Visual User Interface Overview of the Visual User Interface The combination of the PC and the GPS Receiver yields a visual user interface called the Receiver Status Screen that lets the user see what the Receiver is doing and how it is progressing towards tracking satellites to eventually lock to the GPS signal When connected to a properly configured PC the Receiver Status Screen can be accessed There are two ways to access and use the Receiver Status Screen By installing a commercially available terminal emulation program and manually sending the SYSTEM STATUS query By installing the SatStat Windows program for continual status screen updates To Access the Manually Operated Receiver Status Screen From the computer keyboard type SYSTEM STATUS and press Enter or Return If no prompt or a corrupted prompt is displayed then refer to the subsection titled If Changes Have Already Been Made to the Serial Port Settings in Chapter 2 of this guide for more informa
47. the time zone to zero 0 0 PTIMe TZONe RESPONSE FORMAT Returns the local time zone offset dd dd This query returns the local time zone offset Response The first returned value is offset hours The second returned value is offset minutes Command Reference 5 60 Command Reference Defining the 1 PPS Reference Edge 59551A Only 59551A PTIMe PPS EDGE SYSTem PRESet Selects the polarity of the 1 PPS on time edge RISing ON VOLATILE This command selects the polarity of the 1 PPS on time edge Expanded Syntax PTIMe PPS EDGE RISing or FALLing Parameter The RISing parameter sets the 1 PPS rising edge as the on time edge The FALLing parameter sets the 1 PPS falling edge as the on time edge 59551A PTIMe PPS EDGE RESPONSE FORMAT Returns the polarity of the 1 PPS on time edge XYZ This query returns the polarity of the 1 PPS on time edge Response RIS indicates that the 1 PPS on time edge is the rising edge FALL indicates that the 1 PPS on time edge is the falling edge Command Reference 5 61 Command Reference Reading Leap Second Status PTIMe LEAPsecond ACCumulated ESIFONISTE RO RLWAT Returns the leap second difference accumulated between GPS dd time and UTC time since the beginning of GPS time The time units are seconds This query returns the leap second difference accumulated between GPS time and UTC time since the beginning of GPS time The time units are seconds
48. valid prior to first satellite tracked see bit 0 of the Operation Status Register Sending this command after this time will generate error 221 The initial date and time needs to be within 3 minutes of the actual date and time to be effective in enabling faster initial GPS acquisition Command Reference 5 8 Command Reference Establishing Position GPS POSition SYSTem PRESet latitude N 0 00 00 000 longitude E 0 00 00 000 height 0 meters Defines the position of the Receiver ION VOLATILE This command defines the position of the Receiver The Receiver uses this position to predict satellite visibility and to determine time An accurate position is necessary for precise time transfer Expanded Syntax GPS POSition N orS lt latitude degree gt lt latitude minute gt lt latitude secona gt E orW lt ongitude degree gt lt longitude minute gt lt longitude second gt lt height above mean sea level in meters gt GPS POSition LAST GPS POSition SURVey Parameter The numeric form of this command requires three position coordinates latitude longitude and height Position must be specified with respect to the World Geodetic System 1984 WGS 1984 datum absolute earth coordinates The latitude coordinate is preceded by either N or S which denotes the northern or southern hemisphere respectively The longitude coordinate is preceded by either E or W which denotes the eastern or western he
49. you want the Receiver to ignore Each satellite has its own unique PRN Context Dependencies This command is always valid On send if any item in the lt PRN gt list is invalid the entire list will be rejected Error 222 will be generated GPS SATellite TRACking IGNore RESPONSE FORMAT Returns list of satellites to ignore dd This query returns a list of satellites to ignore for tracking Each satellite is identified by its pseudorandom noise code PRN Zero 0 indicates no satellites being ignored Response A value of 0 indicates no satellites being ignored If any satellite is being ignored the pseudorandom noise code PRN of the satellite is returned Context Dependencies This query is always valid GPS SATellite TRACking INCLude SYSTem PRESet Adds the specified satellites to the list that the Receiver crane considers for tracking ON VOLATILE This command adds the specified satellites to the list that the Receiver considers for tracking Actual satellite selection is based on satellite visibility geometry and health Expanded Syntax GPS SATellite TRACking INCLude lt PRN gt lt PRN gt GPS SATellite TRACking INCLude NONE GPS SATellite TRACking INCLude ALL Parameter lt PRN gt parameter is the pseudorandom noise code of the satellite s you want the Receiver to include Each satellite has its own unique PRN Context Dependencies This command is always valid On send if
50. 137 installing SatStat 3 8 installing the SatStat 3 8 interface RS 232C 2 3 interface port PORT 1 1 3 PORT 2 1 2 internal reference oscillator 5 7 5 38 internal self test diagnostics 5 89 Interpolators 5 89 introduction commands 4 22 IRIG B connector 1 3 IRIG B output 1 3 J jack power power 1 3 K keyword separator 5 7 L laptop connection 2 7 LAST 5 121 latitude 4 23 5 7 5 13 5 15 5 17 5 18 Command Index 7 Command Index leap second 4 32 leap second status 5 92 LED Alarm 1 2 GPS Lock 1 2 Holdover 1 2 Power 1 2 LED Alarm 4 29 5 53 LED GPS Lock 4 27 LED Holdover 4 27 LEDs 4 27 lifetime count 5 90 lifetime count 4 30 list of commands 4 2 configuration factory default values 5 132 error types 5 4 factory default values 5 132 response format 5 13 system preset 5 133 literal 5 8 local time 4 32 locking to GPS satellites 4 23 4 25 5 7 5 8 5 9 5 10 5 12 5 13 5 15 5 17 5 19 5 21 5 23 5 25 5 27 5 28 5 29 5 30 5 32 5 33 5 35 5 37 5 46 5 47 5 48 5 49 5 50 5 52 5 53 log diagnostic 4 29 5 53 5 59 5 60 5 61 5 63 5 64 log error 4 29 5 53 5 54 5 57 5 139 longitude 4 23 5 7 5 13 5 15 5 17 5 18 M MAXimum 5 8 maximum value 5 8 memory overflow 4 36 5 110 messages program 5 10 response 5 11 Command Index 8 MINimum 5 8 minimum value 5 8 modem eliminator cable 2 5 monitoring 1 PPS synchronizati
51. 19 COUNt lt data set gt 5 120 SAVE 5 120 SAVE 5 121 POINts 5 116 POINts lt data set gt 5 116 TSTamp lt data set gt 5 117 DATA lt data set gt 5 114 TSTamp lt channel gt EDGE 5 111 EDGE 5 111 STATus lt register gt CONDition 5 79 ENABIe 5 81 ENABIle 5 82 EVENt 5 80 NTRansition 5 83 NTRansition 5 84 PTRansition 5 83 PTRansition 5 84 PRESet ALARm 5 74 QUEStionable CONDition General Index USER 5 87 EVENt USER 5 88 SYNChronization FFOMerit 5 41 HOLDover DURation THReshold 5 47 EXCeeded 5 48 THReshold 5 47 DURation 5 46 INITiate 5 49 RECovery INITiate 5 50 LIMit IGNore 5 52 TUNCertainty PREDicted 5 42 PRESent 5 43 WAITing 5 50 IMMediate 5 52 STATe 5 39 TFOMerit 5 44 TINTerval 5 45 SYSTem COMMunicate lt port gt BAUD 5 123 BAUD 5 124 BITS 5 124 BITS 5 125 FDUPlex 5 125 FDUPlex 5 126 PACE 5 126 PACE 5 127 PARity 5 127 PARity 5 128 PRESet 5 132 SBITs 5 129 SERiall SBITs 5 128 COMMunicate 5 123 DATE 5 95 ERRor 5 57 5 139 LANGuage 5 140 LANGuage 5 141 PRESet 5 132 STATus LENGth 5 56 STATus 5 55 TIME 5 95 SYSTEM STATUS query 3 3 lt lt numeric value gt 5 8 1 1 PPS reference edge 4 32 10MHz output 5 38 10MHz output quality 4 27 4 32 5 38 5 39 5 40 5 41 5 42 5 43 5 44 5 45 5 46 5 47 5 48 1PPS connector 58503A 1 3 1PPS connector 59551A
52. 24 5 125 5 132 date and time outputs 4 25 4 32 5 8 DB 25 connector 2 5 DB 9 connector 2 5 dc power 1 3 DCE 2 5 dd 5 13 dd 5 13 decimal point 5 8 5 14 default values 3 5 defaults factory 3 5 defaults factory settings 2 9 4 40 5 131 5 132 DEG 5 9 delay values antenna cables 5 30 delay values antenna cables 4 25 5 8 5 30 description response formats ASCII 5 6 serial interface ports 2 3 status registers 5 65 status reporting system 5 65 status alarm reporting system 5 65 description format 5 5 diagnostic log 4 29 5 53 5 59 5 60 5 61 5 63 5 64 diagnostic Log messages 5 59 diagnostic test 5 90 diagnostic tests 4 30 5 54 5 89 5 90 5 91 result 5 91 diagnostics internal self test 5 89 diagram serial interface cable 2 8 Diagram 5 68 documents list 5 18 related 5 18 download 5 137 downloading Using SatStat 5 3 downloading new firmware 5 3 DTE 2 5 duplex state 5 125 5 126 E echoing of the characters you type 5 125 5 126 5 132 EEPROM 5 89 5 138 EPROM 5 89 erasing EEPROM 5 139 error hardware firmware error 5 5 query 5 6 semantic 5 5 syntactic 5 4 error analysis 4 29 5 53 5 54 5 Command Index 5 Command Index 57 5 139 error behavior 5 6 error log 4 29 5 53 5 54 5 57 5 139 error messages 4 29 5 53 error queue 4 29 5 53 5 57 5 139 5 3 error recovery serial port 4 29 4 38 5 53 5 130
53. 36 time stamp polarity 4 36 5 110 5 111 time stamping 1 3 4 36 5 110 5 111 5 113 5 114 5 115 5 116 5 117 5 118 5 119 5 120 5 121 time stamps 5 110 Time Stamps 4 36 time tag 1 3 4 36 5 110 5 111 5 113 5 114 5 115 5 116 5 117 5 118 5 119 5 120 5 121 Time tag inputs 1 3 time tagging input 4 36 time transfer information 5 7 time zone setting 4 32 General Index 14 5 92 5 97 time stamped edge 5 111 time stamped edge 5 111 Time stamped Edge 4 36 timing outputs 4 27 5 39 5 40 5 41 5 42 5 44 5 46 5 47 5 48 TSTamp n 5 113 5 114 5 117 tutorial using the Status Screen 3 10 U UART 5 89 units 5 9 upgrading firmware 2 3 5 135 Upgrading firmware 4 42 Using the Receiver Status Screen 3 1 UTC 5 7 UTC timeline 5 92 V V 5 9 visible satellites 5 35 W Windows program Receiver Status screen 5 3 Receiver Status Screen 3 8 X XON 5 126 XYZ 5 16
54. 39 LIFetime COUNt 5 90 LOG CLEar 5 61 CLEar lt current log size gt 5 62 COUNt 5 63 READ ALL 5 62 READ 5 63 READ lt entry number gt 5 64 QUERy RESPonse 5 130 ROSCillator EFControl RELative 5 39 TEST RESult 5 91 TEST 5 90 FOR Mat DATA 5 115 DATA 5 115 GPS INITial DATE 5 9 POSition 5 10 TIME 5 12 POSition 5 13 ACTual 5 17 HOLD LAST 5 17 STATe 5 19 SURVey PROGress 5 19 STATe 5 20 POWerup 5 21 POWerup 5 22 STATe 5 21 POSition 5 15 REFerence ADELay 5 30 ADELay 5 32 VALid 5 33 SATellite TRACking COUNt 5 35 EMANgle 5 23 EMANgle 5 24 General Index IGNore 5 25 ALL 5 25 COUNt 5 28 NONE 5 25 STATe 5 29 IGNore 5 26 INClude COUNt 5 28 STATe 5 29 INCLude 5 27 ALL 5 27 NONE 5 27 INCLude 5 27 TRACKking 5 34 ViSible PREDicted COUNt 5 37 PREDicted 5 35 LED ALarm 5 75 GPSLock 5 40 HOLDover 5 40 PTIMe DATE 5 95 LEAPsecond ACCumulated 5 99 DATE 5 100 DURation 5 101 STATe 5 102 PPS EDGE 5 98 EDGE 5 98 TCODe 5 93 TCODe response 5 93 TIME STRing 5 96 TIME 5 95 TZONe 5 97 TZONe 5 97 PULSe CONTinuous PERiod 5 104 General Index 2 PERiod 5 104 STATe 5 105 STATe 5 105 REFerence EDGE 5 106 EDGE 5 106 STARt DATE 5 107 DATE 5 107 TIME 5 108 TIME 5 109 SENSe DATA CLEar 5 112 CLEar lt data set gt 5 113 MEMory OVERflow COUNt 5 1
55. 4 datum absolute earth coordinates Command Reference 5 7 Command Reference The latitude coordinate is preceded by either N or S which denotes the northern or southern hemisphere respectively The longitude coordinate is preceded by either E or W which denotes the eastern or western hemisphere respectively The following table lists the allowed settings of other parameters Parameter Range Pression Parameter Range Precision lt latitude degrees gt lt longitude degrees gt 0 to 180 0 to 59 999 0 001 lt longitude seconds gt 0 to 59 999 0 001 lt height m gt 1000 00 to 0 01 18 000 00 Context Dependencies This command is valid while the Receiver is in survey mode prior to first computed position Sending this command while the Receiver is not in survey mode will generate error 221 GPS INITial TIME SYSTem PRESet Sets an approximate time for faster initial GPS acquisition pbs Sas OLATILE This command sets an approximate time for faster initial GPS acquisition Following powerup the Receiver obtains the current time from satellite data This process occurs automatically Providing an approximate time however reduces the time to initial GPS tracking by assisting the Receiver in finding satellites Expanded Syntax GPS INITial TIME lt hour gt lt minute gt lt second gt Parameter Range all parameters hour minutes seconds must be valid Context Dependencies This command is
56. 4 10 Identifying Time of Next 1 PPS Reference Edge page 4 10 Reading Current Time page 4 10 Applying Local Time Zone Offset page 4 10 Defining the 1 PPS Reference Edge 59551A Only page 4 10 Reading Leap Second Status page 4 10 Programmable Pulse Output 59551A Only page 4 11 Event Time Stamping 59551A Only page 4 12 Defining the Time stamped Edge page 4 12 Clearing Time Stamp Memory page 4 12 Reading Time Stamps page 4 12 Processing Memory Overflows page 4 12 Serial Interface Communication page 4 13 Configuring I O Port 1 page 4 13 Configuring I O Port 2 59551A Only page 4 13 Recovering the Last Query Response page 4 13 Receiver Initialization page 4 14 Receiver Identification Upgrade page 4 15 Reading Product Identification page 4 15 Installing Firmware via I O Port 1 page 4 15 Receiver Commands at a Glance Status Reporting System at a Glance page 4 1 Command Quick Reference 4 3 NOTE Command Quick Reference An Introduction to GPS Receiver Commands An Introduction to GPS Receiver Commands SCPI Conformance Information The SCPI commands used in the GPS Receiver are in conformance with the SCPI Standard Version 1994 0 Details of all the GPS Receiver commands can be found in Chapter 5 Command Reference of this guide Information on the SCPI commands format syntax parameter and response types is provided in Appendix B SCPI Syntax and Styl
57. 5 84 powerup 5 71 5 79 5 80 5 81 5 82 5 83 5 84 questionable 5 71 5 79 5 80 5 81 5 82 5 83 5 84 5 87 status information 5 53 status registers 5 65 status reporting 4 29 4 30 5 53 5 54 5 65 5 68 5 70 5 71 5 72 5 73 5 75 5 76 5 77 5 78 5 79 5 80 5 81 5 82 5 83 5 84 5 85 5 86 5 87 5 88 status reporting system 5 65 Status Reporting System Diagram 5 68 status screen 3 8 3 11 4 29 5 55 status alarm reporting system 5 65 stop bits 2 9 5 128 5 129 5 132 string 5 8 subsystem command syntax 5 5 suffix elements 5 9 multiplers 5 9 suffix multipler 5 9 suffixes 5 8 summary commands 4 2 survey mode 5 19 5 20 synchronization of output signals 4 27 5 39 5 40 5 41 5 42 5 44 5 46 5 47 5 48 synchronizing to reference 4 27 5 38 syntactic error 5 4 syntax 4 22 5 4 program messages 5 10 Command Index 11 Command Index response messages 5 12 syntax SCPI 5 3 SYSTEM STATUS command 3 8 STATUS query 3 8 system preset 5 133 system time 4 32 5 92 T Table antenna delay table 5 30 factory instrument settings 5 132 5 133 5 134 factory serial port settings 5 132 telecommunication 3 6 terminal communications 3 5 3 6 terminal emulation program 3 4 terminal emulation program 3 4 terminator command 5 10 test result 5 91 TFOM 4 27 5 44 5 93 time and date outputs 4 25 4 32 5 8 5 33 5 92 5 93 5 94 5 95 5 96 time of day
58. 542G interface cable 2 6 HP 24542U cable 2 8 HP 40242M interface cable 2 6 58503A indicators Alarm 1 2 GPS Lock 1 2 Holdover 1 2 Power 1 2 58503A inputs Power 1 3 58503A interface port PORT 1 1 3 58503A outputs 10 MHz OUT 1 3 1PPS 1 3 Alarm 1 3 58506A 507A S508A cable 5 31 59551A indicators Command Index Alarm 1 2 GPS Lock 1 2 Holdover 1 2 Power 1 2 59551A inputs Power 1 3 59551A interface port PORT 1 1 3 PORT 2 1 2 59551A outputs 1PPS 1 3 Alarm BITE 1 3 IRIG B 1 3 Programmable Pulse 1 3 SatStat 3 3 3 8 3 9 3 10 5 3 58506A antenna cable assembly 5 30 58507A antenna cable assembly 5 30 58508A antenna cable assembly 5 30 58511A antenna cable assembly 5 30 HZ 5 9 I T O Port 1 4 38 identification of Receiver 4 42 5 136 IEEE 488 2 description 5 4 IEEE Standard 488 2 obtaining copy of standard 5 18 TEEE488 2 syntax 5 5 In This Guide 0 3 ix indicator Alarm 1 3 indicators Alarm 1 2 GPS Lock 1 2 Holdover 1 2 Power 1 2 initialization 5 131 initialize 4 40 initializing the Receiver 4 40 initiating manual Holdover 5 38 5 49 input antenna 3 4 4 25 5 8 5 30 Time Tag 4 36 input power 1 3 inputs antenna 1 3 time tag 1 3 install firmware 2 3 5 135 INSTALL 5 140 INSTALL language 5 137 installation 4 42 5 9 5 23 installing firmware 5 137 installing firmware via I O Port 1 4 42 installing firmware via I O PORT 1 5 135 5
59. 65 status reporting 4 29 4 30 5 53 5 54 5 65 5 68 5 70 5 71 5 72 5 73 5 75 5 76 5 77 5 78 5 79 5 80 5 81 5 82 5 83 5 84 5 85 5 86 5 87 5 88 status reporting system 5 65 Status Reporting System Diagram 5 68 status screen 3 8 3 11 4 29 5 55 status alarm reporting system 5 65 stop bits 2 9 5 128 5 129 5 132 string 5 8 subsystem command syntax 5 5 suffix elements 5 9 multiplers 5 9 suffix multipler 5 9 suffixes 5 8 summary commands 4 2 survey mode 5 19 5 20 synchronization of output signals 4 27 5 39 5 40 5 41 5 42 5 44 5 46 5 47 5 48 synchronizing to reference 4 27 5 38 syntactic error 5 4 syntax 4 22 5 4 program messages 5 10 response messages 5 12 syntax SCPI 5 3 SYSTEM STATUS command 3 8 STATUS query 3 8 system preset 5 133 system time 4 32 5 92 T Table antenna delay table 5 30 factory instrument settings General Index 13 General Index 5 132 5 133 5 134 factory serial port settings 5 132 telecommunication 3 6 terminal communications 3 5 3 6 terminal emulation program 3 4 terminal emulation program 3 4 terminator command 5 10 test result 5 91 TFOM 4 27 5 44 5 93 time and date outputs 4 25 4 32 5 8 5 33 5 92 5 93 5 94 5 95 5 96 time of day outputs 4 25 4 32 5 8 5 33 5 92 5 93 5 94 5 95 5 96 time stamp polarity of the edges 5 111 Time Stamp memory 4
60. 7 5 48 5 49 5 50 5 52 5 53 satellite reacquisition 4 27 satellite selection 4 25 5 7 satellite tracking at installation 4 23 5 7 5 9 satellites selection 5 23 SatStat 3 8 3 9 3 10 SCPI 5 3 description 5 4 version 4 22 SCPI Command and Query Format 5 4 SCPI conformance Information 4 22 SCPI standard 5 18 self test 3 7 4 30 5 54 5 89 5 90 5 91 selftest 5 89 self test diagnostics 3 7 semantic error 5 5 separator keyword 5 7 parameter 5 8 serial interface cable diagram 2 8 serial interface communication 4 38 serial interface port preset 5 131 General Index serial interface port PORT 1 1 3 PORT 2 1 2 serial Interface port 2 3 2 4 serial interface ports 2 3 serial number 5 136 serial port error recovery 4 29 4 38 5 53 5 130 serial port I O 4 38 5 132 serial port settings 2 11 SERIAL 1 5 123 SERIAL2 5 123 setting up the Receiver 3 4 settings serial port 2 11 setup 4 42 5 9 5 23 signal loss 4 27 5 38 5 46 5 47 5 48 5 49 5 50 5 52 Software pacing 2 9 status alarm 5 68 5 75 command error 5 72 5 85 hardware 5 70 5 79 5 80 5 81 5 82 5 83 5 84 holdover 5 71 5 79 5 80 5 81 5 82 5 83 5 84 operation 5 69 5 79 5 80 5 81 5 82 5 83 5 84 powerup 5 71 5 79 5 80 5 81 5 82 5 83 5 84 questionable 5 71 5 79 5 80 5 81 5 82 5 83 5 84 5 87 status information 5 53 status registers 5
61. ANTENNA OUTPUTS TIME TAG INPUTS O00 SZ 1PPS Programmable IRIG B d POWER Alarm BITE 120 240 VAC PORT 1 50 60 Hz 50 VA MAX 0000800008008 cesccsccovee 1 1 PPS connector for outputting a continuous 1 Pulse Per Second signal 2 Programmable Pulse output connector for outputting pulses at user specified time period 3 Alarm BITE Built In Test Equipment relay for external devices such as red light bell or horn to indicate that the Module has detected an internal condition that requires attention The relay opens and closes with the Alarm indicator Mating connector is Amphenol part number 31 224 glass filled Noryl or 31 2226 Teflon 4 IRIG B output for outputting formatted time code signals This signal is used for general purpose time distribution and magnetic tape annotation applications requiring the time of year 5 Time tag input connectors for time stamping TTL conditioned signals 6 N type female ANTENNA connector PORT 1 RS 232C serial interface port for remote control monitoring and retrieving of the Module s memory data and upgrading Module software 8 Power input jack Front and Rear Panels at a Glance 1 3 Front and Rear Panels at a Glance 58503A Front Panel at a Glance 58503B GPS TIME AND FREQUENCY REFERENCE RECEIVER Power GPS Lock Holdover Alarm oO oO oO oO 1 When the Power indicator 3 When the Ho
62. Cll encoded byte corresponding to 13 decimal lt new line gt is defined as a single ASCll encoded byte corresponding to 10 decimal Command Syntax and Style B 12 Receiver Firmware Installation Receiver Firmware Installation Reference Documentation Reference Documentation This section contains a list of documentation related to the use of the Receiver s RS 232C serial port Additional information that you may find useful can be found in the following publications 1 2 Beginner s Guide to SCPI Part Number H2325 90001 July 1990 Edition Beginner s Guide to SCPI Barry Eppler Hewlett Packard Press Addison Wesley Publishing Co 1991 Standard Commands for Programmable Instruments SCP Version 1992 0 This standard is a guide for the selection of messages to be included in programmable instrumentation It is primarily intended for instrument firmware engineers However you may find it useful if you are programming more than one instrument that claims conformance to the SCPI standard You can verify the use of standard SCPI commands in different instruments To obtain a copy of this standard contact SCPI Consortium 8380 Hercules Suite P3 La Mesa CA 91942 Phone 619 697 8790 FAX 619 697 5955 The International Institute of Electrical Engineers and Electronic Engineers IEEE Standard 488 2 1987 IEEE Standard Codes Formats Protocols and Common Commands for Use with ANSI TEEE Std 488 1 1987 P
63. Dover DURation THReshold RESPONSE FORMAT Returns the duration in seconds which represents a limit dd against which the elapsed time of holdover is compared This query returns the duration in seconds which represents a limit against which the elapsed time of holdover is compared If the elapsed time of holdover and associated processes exceeds the limit a flag is set Expanded Syntax SYNChronization HOLDover DURation THReshold Response The threshold units are seconds The resolution is 1 second SYNChronization HOLDover DURation THReshold RESHON G HKORKEN EXCeeded Identifies if the Receiver has been in holdover longer than the Oori amount of time specified by the THReshold command Command Reference 5 26 Command Reference This query identifies if the Receiver has been in holdover longer than the amount of time specified by the THReshold command If it has 1 will be returned Response A value of 1 indicates that the Receiver is in holdover and has been operating in holdover for a duration that exceeds the specified duration The value 0 indicates either the Receiver is not in holdover or it has been in holdover for less than the specified duration Operating in Holdover O Initiating Manual Holdover SYNChronization HOLDover INITiate Places the Receiver in holdover mode EVENT This command places the Receiver in holdover mode The Receiver will stay in holdover until you send SYNC HOLD REC IN
64. HOLD LAST GPS POSition HOLD STATe GPS POSition SURVey PROGress GPS POSition SURVey STATe ONCE GPS POSition SURVey STATe GPS POSition SURVey STATe POWerup ON or OFF GPS POSition SURVey STATe POWerup Selecting Satellites lt select IGNore or INCLude GPS SATellite TRACking EMANgle lt degrees gt GPS SATellite TRACking EMANgle GPS SATellite TRACking IGNore lt PRN gt lt PRN gt GPS SATellite TRACking IGNore GPS SATellite TRACking INCLude lt PRN lt PRN gt GPS SATellite TRACking INCLude GPS SATellite TRACking lt select gt ALL GPS SATellite TRACking lt select gt COUNt GPS SATellite TRACking lt select gt NONE GPS SATellite TRACking lt select STATe lt PRN gt Compensating for Antenna Delay GPS REFerence ADELay lt seconds gt GPS REFerence ADELay Monitoring Acquisition GPS REFerence VALid GPS SATellite TRACking GPS SATellite VISible PREDicted GPS SATellite TRACking COUNt GPS SATellite VISible PREDicted COUNt 1 PPS Reference Synchronization Monitoring 1 PPS Synchronization SYNChronization STATe DIAGnostic ROSCillator EFControl RELative LED GPSLock LED HOLDover Assessing 1 PPS Quality SYNChronization FFOMerit SYNChronization HOLDover TUNCertainty PREDicted SYNChronization HOLDover TUNCertainty PRESent SYNChronization TFOMerit SYNChronization TINTerval SYNChronization HOLDover DURation SYNChronization HOLDover DURation THReshold l
65. IT Context Dependencies This command is not valid prior to the first lock following powerup see bit 2 of the Powerup Status Register or SYSTem PRESet Sending this command before the first lock will generate error 221 See Also SYNChronization HOLDover RECovery INITiate O Recovering from Holdover SYNChronization HOLDover WAITing RESPONSE FORMAT Returns prioritized reason for why the Receiver is waiting to XYZ recover This query returns prioritized reason for why the Receiver is waiting to recover Response HARD indicates there is an internal hardware reason GPS indicates there are no satellites LIM indicates the time interval between GPS and internal oscillator is exceeding the limit and NONE indicates the Receiver isn t waiting to recover Command Reference 5 27 Command Reference Note that if holdover has been initiated by sending the SYNC HOLD INIT command the Receiver is not waiting to recover the response is NONE This query is always valid If not in holdover and waiting to recover NONE will be the response SYNChronization HOLDover RECovery INITiate Initiates a recovery from manually initiated holdover EVENT This command initiates a recovery from manually initiated holdover Use this command to take the Receiver out of a manually selected holdover This command is not needed to initiate holdover recovery in any other situation See Also SYNChronization HOLDover INITiate SYNChronization
66. N Using this command while the Receiver is in normal locked operation could cause the Receiver go into holdover Expanded Syntax GPS REFerence ADELay lt numeric_value gt Parameter Numeric_value range is 0 to 0 000999999 seconds The resolution is 1 nanosecond Zero cable delay is set for a zero length antenna cable Consult a cable data book for the delay per meter for the particular antenna cable used in order to compute the total cable delay needed for a particular installation See Also GPS REFerence ADELay The table below lists the delay values that you need to use with the GPS REFerence ADELay command for the available cable assemblies Cable Model Length RG 213 or Belden 8267 Number Antenna Delay Value 58507A 100 ft 30 5 m 154 nanoseconds 58508A 175 ft 53 3 m 270 nanoseconds 58511A 200 ft 61 m 308 nanoseconds The nominal delay value is labeled on the 58506A 507A 508A 511A cable Command Reference 5 17 Command Reference GPS REFerence ADELay RESPONSE FORMAT Returns the GPS antenna delay value in seconds d dEe This query returns the GPS antenna delay value in seconds This is the delay value set by the system installer or the factory default It is not a value measured by the Receiver Response The time units are seconds Command Reference 5 18 Command Reference Monitoring Acquisition GPS REFerence VALid RESPONSE FORMAT Identifies whether date and time are valid Oor1 Th
67. NChronization STATe Returns the Receiver state DIAGnostic ROSCillator EFControl RELative LED GPSLock LED HOLDover Assessing 1 PPS Quality SYNChronization FFOMerit Returns the Frequency Figure of Merit SYNChronization HOLDover TUNCertainty PREDicted Returns an estimate of the time error that can be expected for a one day holdover given the current state of SmartClock learning in the Receiver SYNChronization HOLDover TUNCertainty PRESent Returns the current time interval error at any time during holdover operation given the current state of SmartClock learning in the Receiver SYNChronization TFOMerit Returns the Time Figure of Merit SYNChronization TINTerval Returns the difference or timing shift between the SmartClock 1 PPS and the GPS 1 PPS signals SYNChronization HOLDover DURation SYNChronization HOLDover DURation THReshold lt seconds gt SYNChronization HOLDover DURation THReshold SYNChronization HOLDover DURation THReshold EXCeeded Operating in Holdover Initiating Manual Holdover SYNChronization HOLDover INITiate Recovering from Holdover SYNChronization HOLDover WAITing Returns prioritized reason why the Receiver is waiting to recover SYNChronization HOLDover RECovery INITiate SYNChronization HOLDover RECovery LIMit GNore SYNChronization MMediate Command Quick Reference 4 7 Command Quick Reference Operating Status Operating Status The following comm
68. Not Tracking PRN El D F7 UTC 20 59 28 31 Jan 1996 7 341 GPS 1PPS Synchronized to UTC 19 4 ANT DLY 0 ns 22 67 Position 26 24 DE Survey 71 4 complete 31 12 N 37 19 32 486 W 121 59 52 082 ELEV MASK 10 deg 40 06 m GPS HEALTH MONI OK Self Test OK Int Pwr OK Oven Pwr OCXO OK EFC OK GPS Rev OK Figure 3 5 Receiver Status Screen Displaying Progress Towards Steady State Operation In the SYNCHRONIZATION area the gt gt marker is pointed at the Locked to GPS line indicating that the Receiver is locked to GPS and stabilizing the frequency of its oscillator This means that the Receiver has phase locked its oscillator to the 1 PPS reference signal provided by GPS but it is not at its final or most stable state The Receiver is locked and the front panel GPS Lock LED is illuminated For users without the command interface PC Terminal emulator connected to the Receiver the illuminated GPS Lock LED is probably the first indication that after powerup that the Receiver is moving towards a stable state With the command interface and status screen you can get more detailed information For example you can read the reference outputs quality indicators in the Reference Outputs area of the status screen These are the Time Figure of Merit TFOM and Frequency Figure of Merit FFOM indicators As shown in Figure 3 5 the TFOM is 4 and the FFOM is 1 These values will eventually dec
69. RASe query response is 1 SYSTem ERRor RESPONSE FORMAT Returns the oldest error in the Error Queue and removes dd XYZ that error from the queue first in first out This query returns the oldest error in the Error Queue and removes that error from the queue first in first out See Appendix A Error Messages in this guide for detailed error information Response The error response format is lt error_number gt lt error_description gt where e The lt error_number gt is an integer transferred as ASCII bytes in lt NR1 gt format integer The range is 32768 to 32767 Command Reference 5 91 R R Command Reference Negative error numbers are defined by the SCPI standard Positive error numbers are defined specifically for this Receiver e An error number value of zero indicates that the Error Queue is empty The maximum length of the lt error_description gt is 255 characters Context Dependencies SYSTem PRESet clears the Error Queue The queue is cleared emptied on CLS power on or upon reading the last error from the queue If the Error Queue overflows the last error in the queue is replaced with the error 350 Queue overflow Any time the queue overflows the least recent errors remain in the queue and the most recent error is discarded The maximum length of the Error Queue is 30 SYSTem LANGuage SYSTem PRESet R Switches the operation mode primary or
70. REDicted 5 35 ALarm 5 75 GPSLock 5 40 HOLDover 5 40 PTIMe DATE 5 95 LEAPsecond ACCumulated 5 99 DATE 5 100 DURation 5 101 STATe 5 102 PPS EDGE 5 98 EDGE 5 98 TCODe 5 93 TCODe response 5 93 TIME STRing 5 96 TIME 5 95 TZONe 5 97 TZONe 5 97 PULSe CONTinuous PERiod 5 104 PERiod 5 104 STATe 5 105 STATe 5 105 REFerence EDGE 5 106 EDGE 5 106 STARt DATE 5 107 DATE 5 107 TIME 5 108 TIME 5 109 SENSe DATA CLEar 5 112 CLEar lt data set gt 5 113 MEMory OVERflow COUNt 5 119 COUNt lt data set gt 5 120 Command Index 2 SAVE 5 120 SAVE 5 121 POINts 5 116 POINts lt data set gt 5 116 TSTamp lt data set gt 5 117 DATA lt data set gt 5 114 TSTamp lt channel gt EDGE 5 111 EDGE 5 111 STATus lt register gt CONDition 5 79 ENABIle 5 81 ENABIle 5 82 EVENt 5 80 NTRansition 5 83 NTRansition 5 84 PTRansition 5 83 PTRansition 5 84 PRESet ALARn 5 74 QUEStionable CONDition USER 5 87 EVENt USER 5 88 SYNChronization FFOMerit 5 41 HOLDover DURation THReshold 5 47 EXCeeded 5 48 THReshold 5 47 DURation 5 46 INITiate 5 49 RECovery INITiate 5 50 LIMit IGNore 5 52 TUNCertainty PREDicted 5 42 PRESent 5 43 WAITing 5 50 IMMediate 5 52 STATe 5 39 TFOMerit 5 44 TINTerval 5 45 SYSTem COMMunicate lt port gt BAUD 5 123 BAUD 5 124 Command Ind
71. SYSTem COMMunicate SERial2 FDUPlex Response A value of 0 indicates echo is OFF A value of 1 indicates echo is ON SYSTem COMMunicate lt port gt PACE SULLA Si R Ft Sets flow control of the specified port ee ON VOLATILE This command sets flow control of the specified port Expanded Syntax SYSTem COMMunicate SERial1 PACE XON or NONE SYSTem COMMunicate SERial2 PACE XON or NONE Parameter The choices are XON or NONE Context Dependencies The software pacing or flow control state is stored in non volatile memory It is unaffected by powerup and SYSTem PRESet Command Reference 5 82 Command Reference SYSTem COMMunicate lt port gt PRESet sets the flow control to NONE which is the factory default state t Must be received via the specified T O port SYSTem COMMunicate lt port gt PACE RESPONSE FORMAT R F Returns flow control state of the specified port XYZ This query returns the flow control state of specified port Expanded Syntax SYSTem COMMunicate SERial1 PACE SYSTem COMMunicate SERial2 PACE Response XON or NONE is returned SYSTem COMMunicate lt port gt PARity SYSTem PRESet R Ft Sets parity of the specified port Roce ION VOLATILE This command sets parity of the specified port Expanded Syntax SYSTem COMMunicate SERial1 PARity EVEN or ODD or NONE SYSTem COMMunicate SERial2 PARity EVEN or ODD or NONE or ONE Parameter The choices for SERi
72. Se REFerence EDGE PULSe REFerence EDGE PULSe STARt DATE PULSe STARt DATE PULSe STARt TIME PULSe STARt TIME Command Reference 5 64 Command Reference 59551A PULSe CONTinuous PERiod SYSTem PRESet Sets the interval between pulses in seconds 1 ION VOLATILE This command sets the interval between pulses in seconds Expanded Syntax PULSe CONTinuous PERiod lt seconds gt Parameter The lt seconds gt parameter range is 1 to 31536000 equivalent to one year Resolution is 1 Context Dependencies The interval set by this command is only used if PULSe CONTinuous STATe is ON 59551A PULSe CONTinuous PERiod RESPONSE FORMAT Returns the interval between pulses in seconds dd This query returns the interval between pulses in seconds Command Reference 5 65 Command Reference 59551A PULSe CONTinuous STATe SYSTem PRESet Controls whether the Programmable Pulse output will be just OFF one pulse or a sequence of pulses ION VOLATILE This command controls whether the Programmable Pulse output will be just one pulse or a sequence of pulses Expanded Syntax PULSe CONTinuous STATe ON or OFF Parameter OFF selects one pulse ON selects a sequence of pulses Context Dependencies With either state OFF or ON the output commences at the time and date defined by PULSe STARt DATE and PULSe STARt TIME commands 59551A PULSe CONTinuous STATe RESPONSE FORMAT Identifies wh
73. Software Pacing NONE XON or NONE Baud Rate 9600 1200 2400 9600 or 19200 Townes fe ids CS Table 2 4 PORT 2 Configuration Factory Default Values 59551A Only Data Bits Fixed at 7 when parity is even or odd Fixed at 8 when parity is none Stops Bits Fixed no choices available Full Duplex ON or OFF Serial Interface Capabilities 2 9 CAUTION NOTE Serial Interface Capabilities Procedures for configuring the RS 232C ports are provided in the following paragraphs If You Need To Make Changes to the Serial Port Settings If you change the serial port settings your changes will be stored in the Receiver Cycling power will not reset to factory defaults Therefore if you make a change it is reeommended that you record the settings and keep the record with the Receiver If you need to change the serial port settings for example to set up for a different computer use the guidelines given in this section Serial port settings are changed by issuing commands It is recommended that you issue a single compound command which simultaneously sets all the serial port parameters Then connect the other computer and begin using the instrument with the new settings If you choose to set parameters one at a time you will make the procedure more difficult That is with each change the instrument will be updated but your computer will retain its original settings At each step you will have stopped serial communicati
74. Status Screen By installing a commercially available terminal emulation program and manually sending the SYSTEM STATUS query see pages 3 7 and 3 8 By installing the SatStat program for continual status screen updates see pages 3 8 and 3 10 The following tutorial demonstrates how you can use the Receiver Status Screen to observe Receiver operation The tutorial uses the manual SYSTEM STATUS method Tutorial on Using the Status Screen to Interface With the Receiver Type SYSTEM STATUS at the scpi gt prompt An initial power up screen is displayed which is similar to the demonstration screen shown in Figure 3 3 The first data that you should look at is in the SYNCHRONIZATION area of the screen It is telling you that it is in the Power up state as indicated by the gt gt marker That is the Receiver has just been put on line Visual User Interface 3 10 Visual User Interface Receiver Status SYNCHRONIZATION Outputs Valid Reduced Accuracy SmartClock Mode Reference Outputs gt gt Locked to GPS stabilizing frequency TFOM 4 FFOM 1 Recovery 1PPS TI 20 ns relative to GPS Holdover HOLD THR 1 000 us Power up Holdrover Uncertainty Predict 432 0 us initial 24 hrs ACQUIS GPS 1PPS Valid Tracking 6___ Not Tracking PRN El AZ PRN El Az 70 301 16 13 258 UTC 18 47 07 31 Jan 1996 186 GPS 1PPS Synchronized to UTC 102 ANT DLY O ns 60 Position 317 MODE Survey 5 4 complete 41
75. Te Oar Returns the include status of the specified satellite The query GPS SATellite TRACking IGNore STATe returns the ignored status of the specified satellite A satellite is specified by its pseudorandom noise code PRN The query GPS SATellite TRACking INClude STATe returns the include status of the specified satellite A satellite is specified by its pseudorandom noise code PRN Command Reference 5 15 Command Reference There may be some delay between changes made to the list of satellites being ignored and their actual removal and inclusion in the tracking process Expanded Syntax GPS SATellite TRACking GNore STATe lt PRN gt GPS SATellite TRACking INClude STATe lt PRN gt Parameter lt PRN gt parameter is the pseudorandom noise code of the satellite s you want the Receiver to ignore or include Each satellite has its own unique PRN Response A value of 0 indicates not on the selected list A value of 1 indicates on the selected list Context Dependencies After a SYSTem PRESet all satellites are removed from the list to ignore Command Reference 5 16 Command Reference Compensating for Antenna Delay GPS REFerence ADELay SYSTem PRESet Sets the GPS antenna delay value in seconds 0 0 ION VOLATILE This command sets the GPS antenna delay value in seconds It instructs the Receiver to output its 1 PPS output pulse earlier in time to compensate for antenna cable delay CAUTIO
76. The lt hour gt range is 0 to 23 e The lt minute gt range is 0 to 59 The lt second gt range is 0 to 59 Command Reference 5 69 Command Reference Event Time Stamping 59551A Only The time stamping feature allows you to use the Receiver with equipment such as a fault analyzer or a surge detector that produces a TTL edge when some important event happens in the base station The Receiver has three time tagging inputs Time Tag 1 Time Tag 2 Time Tag 3 which record the time of occurrence of TTL edge s The following commands are provided to allow you to tag and record events such as power surges and power outages E Defining the Time stamped Edge SENSe TSTamp lt channel gt EDGE SENSe TSTamp lt channel gt EDGE E Clearing Time Stamp Memory SENSe DATA CLEar SENSe DATA CLEar E Reading Time Stamps SENSe DATA FORMat DATA FORMat DATA SENSe DATA POINts SENSe DATA POINts SENSe DATA TSTamp E Processing Memory Overflow SENSe DATA MEMory OVERflow COUNt SENSe DATA MEMory OVERflow COUNt SENSe DATA MEMory SAVE SENSe DATA MEMory SAVE Defining the Time stamped Edge 59551A SENSe TSTamp lt channel gt EDGE SYSTem PRESet Selects the polarity of the edges the Receiver will time stamp RISing ION VOLATILE Command Reference 5 70 Command Reference This command selects the polarity of the edges the Receiver will time stamp Expanded Syntax
77. When any additional events are detected at the input the overflow count increments If memory management protocol has been set to FIRST the first 256 time stamps are recorded The overflow count indicates the number of time stamps which followed the last recorded stamp and which were discarded If memory management protocol has been set to LAST the most recent 256 time stamps are recorded The overflow count indicates the number of stamps which were collected prior to the first recorded stamp and which were overwritten Response Returns three comma separated floating point numbers corresponding to the overflow count of each of the three inputs 1 2 3 Context Dependencies SYSTem PRESet clears the time stamp measurement buffers and overflow counts Time stamps are not collected until after the Receiver has completed its powerup and has reached initial GPS lock 59551A Command Reference 5 76 Command Reference SENSe DATA MEMory OVERflow COUNt BESRO NERO RMA Returns an overflow count for the selected Time Tag input d dEe This query returns an overflow count for the selected Time Tag input Use TSTamp 1 TSTamp 2 or TSTamp 3 to select or query one input at a time Expanded Syntax SENSe DATA MEMory OVERflow COUNt TSTamp 1 or TSTamp 2 or TSTamp 3 Response Returns one floating point number corresponding to the overflow count of the selected Time Tag input Context Dependencies SYSTe
78. a 097 59551 02 Symmetricom Issue 1 Apr 00 59551A GPS Measurements Synchronization Module and 58503A GPS Time and Frequency Reference Receiver Operating and Programming Guide In This Guide This guide describes how to operate the 59551A GPS Measurements Synchronization Module and the 58503A GPS Time and Frequency Reference Receiver via the RS 232C port s The information in this guide applies to instruments having the number prefix listed below unless accompanied by a Manual Updating Changes package indicating otherwise SERIAL PREFIX NUMBER 3542 and above 59551A 3542 and above 58503A Instruments with serial numbers below 3542 may have earlier versions of firmware installed There are no operator specific differences in previous versions of firmware FIRMWARE REVISION 3543 and above 59551A 3543 and above 58503A Firmware revision can be identified by using a TDN command sent to the Receiver via RS 232C port Refer to Chapter 2 Serial Interface Capabilities in this guide for instructions on connecting a computer or terminal to this product For assistance contact Symmetricom Inc 2300 Orchard Parkway San Jose CA 95131 1017 U S A Call Center 888 367 7966 from inside U S A only toll free 408 428 7907 U K Call Center 44 7000 111666 Technical Assistance 44 7000 111888 Sales Fax 408 428 7998 E mail ctac symmetricom com Internet http www symme
79. all are EVEN ODD or NONE The choices for SERial2 are EVEN ODD NONE or ONE Context Dependencies The parity state is stored in non volatile memory It is unaffected by powerup and SYSTem PRESet SYSTem COMMunicate lt port gt PRESet sets the parity to NONE which is the factory default state If parity is enabled the Receiver sends receives 7 data bits plus 1 parity bit If parity is disabled the Receiver sends receives 8 data bits Command Reference 5 83 Command Reference t Must be received via the specified T O port SYSTem COMMunicate lt port gt PARity RESPONSE FORMAT R F Returns parity setting of the specified port XYZ This query returns the parity setting of the specified port Expanded Syntax SYSTem COMMunicate SERial1 PARity SYSTem COMMunicate SERial2 PARity Response EVEN ODD NONE or ONE is returned SYSTem COMMunicate SERial1 SBITs SYSTem PRESet R Sets the stop bits value of PORT 1 fue ION VOLATILE This command sets the stop bits value of PORT 1 Expanded Syntax SYSTem COMMunicate SERial1 SBITs 1 or2 Parameter The possible stop bits values that can be entered are 1 or 2 Context Dependencies The stop bits value is stored in non volatile memory It is unaffected by powerup and SYSTem PRESet SYSTem COMMunicate SERial1 PRESet sets the stop bits value to 1 which is the factory default value SYSTem COMMunicate lt port gt SBITs RESPONSE FORMAT n
80. alue SYSTem COMMunicate lt port gt BITS RESPONSE FORMAT sb F Returns the data bits value of specified port dd This query returns the data bits value of the specified port Expanded Syntax SYSTem COMMunicate SERial1 BITS SYSTem COMMunicate SERial2 BITS SYSTem COMMunicate lt port gt FDUPlex SU IES R Ft Sets the duplex state of specified port aes ON VOLATILE This command sets the duplex state of the specified port Use this command when you cannot see on the computer screen the characters you are typing for your command Expanded Syntax SYSTem COMMunicate SERial1 FDUPlex ON or OFF SYSTem COMMunicate SERial2 FDUPlex ON or OFF Parameter ON enables echoing of the characters you type i e when typing a command the ON state allows you to see on the computer screen the characters you type OFF disables the echoing of the characters you type Command Reference 5 81 Command Reference Context Dependencies The duplex state is stored in non volatile memory It is unaffected by powerup and SYSTem PRESet SYSTem COMMunicate lt port gt PRESet sets the duplex state to ON which is the factory default state t Must be received via the specified T O port SYSTem COMMunicate lt port gt FDUPlex RESPONSE FORMAT R F Returns the duplex state of the specified port Oor1 This query returns the duplex state of the specified port Expanded Syntax SYSTem COMMunicate SERial1 FDUPlex
81. and Index lists all of the commands alphabetically and provides page references General Index In This Guide Front and Rear Panels at a Glance Front and Rear Panels at a Glance 59551A Front Panel at a Glance T S SYNCHRONIZATION MODULE Power GPS Lock Holdover Alarm oO Q 1 When the Power indicator is illuminated 4 When the Alarm indicator is illuminated it it indicates that the proper input power is indicates that the Module has detected a supplied to the Module condition that requires attention 2 When the GPS Lock indicator is 5 PORT 2 RS 232C serial interface port for illuminated it indicates that the Module local control monitoring and retrieving of is tracking satellites and has phase locked the Module s memory data its internal reference to the reference provided by GPS 3 When the Holdover indicator is illuminated it indicates that the Module is not phase locking its internal reference to the reference provided by GPS Typically this would happen due to loss of satellite tracking The internal reference oscillator will determine the accuracy of the 1 PPS signal when the Module is operating in holdover See specification for Accuracy in Holdover in Chapter 3 59551A Specifications in the Getting Started guide Front and Rear Panels at a Glance 1 2 Front and Rear Panels at a Glance 59551A Rear Panel at a Glance
82. ands are provided to obtain Receiver status information There are several ways to obtain Receiver status using commands For example you can send a command to display the Receiver Status screen to read the error queue and to read the diagnostic log You can also send a sequence of commands to read and control the status registers for alarm generation Receiver Operation at a Glance SYSTem STATus Outputs a fully formatted status screen SYSTem STATus LENGth Reading the Error Queue SYSTem ERRor Returns the oldest error in the Error Queue and removes that error from the queue first in first out Reading the Diagnostic Log DIAGnostic _OG CLEar Clears the diagnostic log DIAGnostic LOG READ ALL Returns all of the most recent diagnostic log entries DIAGnostic _OG CLEar lt current log size gt DIAGnostic _LOG COUNt DIAGnostic _LOG READ DIAGnostic LOG READ lt entry number gt Monitoring Status Alarm Conditions Clearing and Presetting Alarms CLS Clears the event status registers and error queue STATus PRESet ALARm Reading and Qualifying Alarms LED ALARm Returns status of front panel Alarm LED SRE lt bit mask gt SRE STB Command Quick Reference 4 8 Command Quick Reference Operating Status Reading and Qualifying Receiver Status lt register gt OPERation lt register gt QUEStionable lt register gt OPERation HARDware lt register gt OPERation HOLDover lt
83. ansition lt register gt OPERation or eo QUEStionable or Enables events to _ OPERation HARDware or report to summary bit OPERation HOLDover or STATus lt register gt ENABle lt bit mask gt OPERation POWerup STATus lt register gt ENABle Figure 5 3 Condition Transition Filter Event Enable and Event Registers STATus lt register gt CONDition RESPONSE FORMAT Reads the specified condition register dd This query reads the specified condition register figures 5 3 and 5 1 Expanded Syntax STATus OPERation CONDition STATus QUEStionable CONDition STATus OPERation HARDware CONDition STATus OPERation HOLDover CONDition STATus OPERation POWerup CONDition Response The range is 0 to 65535 The response value represents the sum of the binary weighted values of the register The value of unused bits is zero Command Reference 5 45 Command Reference Note that some bits those which are event only have no corresponding conditions Theory A condition register continuously monitors the hardware and firmware status that is the operating conditions of the instrument Conditions register bits are updated in real time there is no latching or buffering Reading Querying a condition register does not change its contents At powerup the conditions registers are cleared STATus lt register gt EVENt RESPONSE FORMAT Reads the specified event register dd This query reads the spec
84. ation The Receiver Status Screen at a Glance Visual User Interface 3 2 page 3 7 page 3 4 page 3 4 page 3 5 page 3 7 page 3 7 page 3 7 page 3 8 page 3 9 page 3 10 page 3 10 page 3 15 page 3 17 Visual User Interface Overview of the Visual User Interface The combination of the PC and the GPS Receiver yields a visual user interface called the Receiver Status Screen that lets the user see what the Receiver is doing and how it is progressing towards tracking satellites to eventually lock to the GPS signal When connected to a properly configured PC the Receiver Status Screen can be accessed There are two ways to access and use the Receiver Status Screen By installing a commercially available terminal emulation program and manually sending the SYSTEM STATUS query By installing the SatStat program for continual status screen updates Visual User Interface 3 3 Visual User Interface Setting Up the GPS Receiver To Connect Antenna System to the Receiver Connect the antenna system to the rear panel ANTENNA Type N connector of the Receiver as described in the instructions given in the subsection titled To Assemble and Install the Antenna System in Chapter 1 of the Getting Started guide NOTE Do not apply power to the Receiver unless a fully operational antenna system is connected to the rear panel ANTENNA input connector Power applied with no antenna input or a non functioning antenna will initiate an ex
85. ation HOLDover RECovery LIMit GNore SYNChronization IMMediate Command Reference 5 21 Command Reference Monitoring 1 PPS Synchronization SYNChronization STATe RESPONSE FORMAT Returns the Receiver state XYZ This query returns the Receiver state Response OFF or HOLD or WAIT or REC or LOCK or POW OFF indicates in diagnostic mode or a temporary start up mode HOLD indicates in manual holdover WAIT indicates waiting for external conditions to allow recovery from holdover REC indicates actively recovering from holdover LOCK indicates locked to GPS POW indicates in powerup prior to first lock Context Dependencies SYSTem PRESet sets the state to POWerup DIAGnostic ROSCillator EFControl RELative RESPONSE FORMAT Returns the Electronic Frequency Control EFC output value oi d dEe the internal reference oscillator This query returns the Electronic Frequency Control EFC output value of the internal reference oscillator It returns a percentage value Response Range is 100 to 100 LED GPSLock RESPONSE FORMAT Returns the state of the front panel GPS Lock LED Oori This query returns the state of the front panel GPS Lock LED The Receiver sets this indicator during normal operation when it has locked the internal reference oscillator and 1 PPS output to GPS Command Reference 5 22 Command Reference Response A value of 0 indicates the LED is off A value of 1 indicates the LED is on
86. can halt the extended search by cycling the Receiver power you may need to leave power off for greater than five seconds Visual User Interface 3 5 Visual User Interface In the Communications dialog box be sure to select the appropriate port or connector COM2 for example Next perform the power up procedure described in the subsections titled To Power Up the Receiver To Configure Terminal Communications for DOS based PC No Windows Make sure you have a DOS telecommunication program such as PROCOMM PLUS and refer to a DOS reference guide for the proper command to send Hint send MODE COM2 9600 N 8 1 or MODE COM2 BAUD 9600 PARITY NONE DATA 8 STOP 1 Next perform the power up procedure described in the following subsection Visual User Interface 3 6 Visual User Interface To Power Up the Receiver Apply the proper power source to the rear panel Power input jack of the Receiver See the appropriate subsection titled To Assemble the DC Power Connector or To Connect AC Power in Chapter 1 of the Getting Started guide The following sequence of events occurs after power is applied to the Receiver a Only the front panel Power indicator lights b After a moment the Receiver runs through its self test diagnostics as indicated by the flashing front panel indicators c After the self test is completed just the Power indicator remains illuminated and the scpi gt prompt is displayed on the screen of
87. cates a diagnostic log entry and NNN is the log entry number YYYYMMDD HH MM 5SS is the date and time of the diagnostic log entry The lt log_message gt is a sequence of up to 255 characters Context Dependencies This query is always valid If no log message is associated with the requested log number error 222 is generated Command Reference 5 35 Command Reference Monitoring Status Alarm Conditions The Receiver is at all times monitoring various operating conditions through a status alarm reporting system The Receiver is shipped from the factory with the status system set to generate an alarm under a default set of operating conditions The monitored operating conditions are organized by function into three major groups Questionable status Command Error status and Operation status The Operation status group has three functional subgroups Powerup status Holdover status and Hardware status All of the operating conditions are summarized by the Alarm status Figure 5 1 on the next page includes the identification of the default alarm conditions Those conditions which are enabled to feed all the way through the system will generate an alarm in a Receiver configured with the factory defaults Note a diagram identical to Figure 5 1 is provides as part of the Receiver Commands at a Glance Status Reporting System at a Glance foldout pages 4 17 and 4 18 respectively Command Reference 5 36 Command Reference
88. cation perform procedure in the subsection titled To Configure Terminal Communications for DOS based PC No Windows on page 3 6 To Configure Terminal Communications for Windows based PC Select or double click on the Terminal icon a picture of a PC with a telephone in front of it in the Accessories window Select Settings then choose Communications A dialog box is displayed that allows you to configure your PC Set the RS 232C port of your PC to match the following default values Pace NONE Baud Rate 9600 Parity NONE Data Bits 8 Stops Bits 1 NOTE The RS 232C port configurations of the Receiver and the PC must be the same for communications between the two Thus for this power up procedure set your PC to match the default values listed above if this Receiver is being powered up for the first time from the factory If the default values have been changed as would be indicated by an error generation or no scpi gt prompt displayed after pressing Return or Enter on your PC then refer to the subsection titled If Changes Have Already Been Made to the Serial Port Settings in Chapter 2 of this guide for more information NOTE Do not apply power to the Receiver unless a fully operational antenna system is connected to the rear panel ANTENNA input connector Power applied with no antenna input or a non functioning antenna will initiate an extended search process that may increase time to reach GPS lock You
89. cement 1 3 3 4 4 25 5 8 5 30 antenna system 3 4 application SatSat 3 8 applying local time zone offset 5 97 ASCII Data 5 16 assessing 1 PPS quality 5 41 B baud 2 9 5 123 5 132 baud 5 124 baud rate 2 9 Belden 8267 cable 5 31 Binary Data 5 17 BINARY Data 5 115 BITE alarm 1 3 Boolean 5 8 C cable assemblies antenna 5 30 cable delay compensation 4 25 5 8 5 30 cables antenna 5 30 crossover 2 5 HP 24542G 2 8 HP 24542G interface 2 6 HP 24542U 2 8 HP 40242M interface 2 6 modem eliminator 2 5 null modem 2 5 clear 5 112 5 113 clear alarm 4 29 5 53 5 73 errors 4 29 5 53 5 57 5 137 clear alarm 4 29 5 53 General Index clear errors 5 137 clear time stamp memory 5 110 comma 5 5 5 8 5 12 command abbreviated 5 7 common 5 4 format 5 5 parameter 5 8 SCPI 5 4 syntax 5 3 5 7 terminator 5 10 terminators 5 5 command error 4 30 5 54 5 65 5 72 Command Error status 5 65 command syntax conventions 4 22 5 4 commands introduction 4 22 Commands at a Glance 4 2 commands summary 4 2 common command syntax 5 5 Common Command Format 5 4 common commands description 5 4 communication serial interface port 2 3 2 4 communication serial interface port 5 122 5 123 5 125 5 126 5 127 5 128 compensating for antenna delay 5 30 configuration PORT 1 2 11 5 122 PORT 2 2 11 5 122 configuration fa
90. ch events from the corresponding event register are enabled to report to the corresponding summary bit of the summarizing condition register Expanded Syntax STATus OPERation ENABle lt bit mask gt STATus QUEStionable ENABle lt bit mask gt STATus OPERation HARDware ENABle lt bit mask gt STATus OPERation HOLDover ENABle lt bit mask gt STATus OPERation POWerup ENABle lt bit mask gt Parameter The lt bit mask gt has a range of 0 to 65535 The lt bit mask gt value represents the sum of the binary weighted values of the register Attempts to set unused bits in an enable register are ignored the value of unused bits is zero STATus lt register gt ENABle RESPONSE FORMAT Reads the specified enable register dd Reading an enable register figures 5 3 and 5 1 identifies which events from the corresponding event register are enabled to report to the corresponding summary bit of the summarizing condition register Expanded Syntax STATus OPERation ENABle STATus QUEStionable ENABle STATus OPERation HARDware ENABle STATus OPERation HOLDover ENABle STATus OPERation POWerup ENABle Response The range is 0 to 65535 Command Reference 5 47 Command Reference The response value represents the sum of the binary weighted values of the register The value of unused bits is zero Theory Reading Querying an enable register does not change its contents STATus lt register gt NTRansition
91. commands are provided to allow you to time tag and record events such as power surges and power outages The time tagging input feature allows you to use the Receiver with equipment which produce a TTL edge when some important event happens in the base station The Receiver has three time tagging inputs which record the time of occurrence of TTL edge s Defining the Time stamped Edge lt channel gt 1 or2 or3 SENSe TSTamp lt channel gt EDGE RISing or FALLing Selects the polarity of the edges the Receiver will timestamp SENSe TSTamp lt channel gt EDGE Returns the polarity of the edges the Receiver will timestamp Clearing Time Stamp Memory SENSe DATA CLEar Clears the data in the measurement buffer for all Time Tag inputs SENSe DATA CLEar TSTamp 1 or TSTamp 2 or TSTamp 3 Reading Time Stamps SENSe DATA TSTamp 1 or TSTamp 2 or TSTamp 3 Returns the data in the timestamp measurement buffer for the specified Time Tag input FORMat DATA ASCii or INTeger FORMat DATA SENSe DATA POINts SENSe DATA POINTs TSTamp 1 or TSTamp 2 or TSTamp 3 SENSe DATA TSTamp TSTamp 1 or TSTamp 2 or TSTamp 3 lt entry number gt Processing Memory Overflow SENSe DATA MEMory OVERflow COUNt SENSe DATA MEMory OVERflow COUNt TSTamp 1 or TSTamp 2 or TSTamp 3 SENSe DATA MEMory SAVE FIRST or LAST SENSe DATA MEMory SAVE Command Quick Reference 4 12 Command Quick Reference Serial Interface Communication
92. condition bit 1 Command Reference 5 38 Command Reference 15V Supply Exceeds Tolerance condition bit 2 5V Supply Exceeds Tolerance condition bit 3 Oven Supply Exceeds Tolerance condition bit 4 EFC Voltage Near Full Scale condition bit 6 EFC Voltage Full Scale condition bit 7 GPS 1 PPS Failure condition bit 8 GPS Failure condition bit 9 Time Interval Measurement Failed event bit 10 Internal Reference Failure condition bit 12 The EEPROM Write Failed event bit 11 indicates that an attempt to write to the non volatile memory failed Holdover Status This Operation subgroup is comprised of operating status that occurs during holdover One or more of the condition changes from this group are summarized in the Operation Status group e The following conditions indicate that the Receiver is in holdover and the specific holdover state Holding condition bit 0 Waiting to Recover condition bit 1 Recovering condition bit 2 e The Exceeding User Threshold condition bit 3 indicates whether or not the user specified holdover duration SYNC HOLDover DURation THReshold is being exceeded Powerup Status This Operation subgroup is comprised of operating status that occurs at powerup One or more of the condition changes from this group are summarized in the Operation Status group e The First Satellite Tracked condition bit 0 is cleared at powerup and set when the first satellite becomes tracke
93. ct Antenna System to the Receiver To Connect PC to the Receiver To Configure Terminal Communications for Windows based PC To Configure Terminal Communications for DOS based PC No Windows To Power Up the Receiver Accessing the Receiver Status Screen the Visual User Interface Overview of the Visual User Interface To Access the Manually Operated Receiver Status Screen To Install the Automated SatStat Program for Continual Status Updates To Operate the Automated SatStat Program Using and Reading the Receiver Status Screen Tutorial on Using the Status Screen to Interface With the Receiver Demonstration of Holdover Operation The Receiver Status Screen at a Glance Chapter 4 Command Quick Reference Chapter Contents An Introduction to GPS Receiver Commands iv 11 10 10 15 17 Contents SCPI Conformance Information Command Syntax Conventions Command Presentation GPS Satellite Acquisition Facilitating Initial Tracking Establishing Position Selecting Satellites Compensating for Antenna Delay Monitoring Acquisition 1 PPS Reference Synchronization Monitoring 1 PPS Synchronization Assessing 1 PPS Quality Operating in Holdover Initiating Manual Holdover Recovering from Holdover Operating Status Clearing and Presetting Alarms Reading and Qualifying Alarms Reading and Qualifying Receiver Status Reading and Qualifying Command Error Status Reporting Questionable Status Assessing Receiver Health System Ti
94. ctory default values 5 132 configure serial interface port s 5 122 configuring I O Port 1 4 38 configuring I O Port 2 59551A 4 38 Configuring PORT 1 2 10 Configuring PORT 2 2 11 configuring the RS 232C ports 2 9 configuring the serial interface port s 5 122 conformance Information SCPI 4 22 connecting antenna 1 3 4 25 5 8 5 30 connecting a computer 2 5 connecting a laptop 2 7 connecting a Laptop 2 6 connecting a modem 2 5 2 6 connecting a PC 2 6 3 4 connecting the antenna system 3 4 Connecting to a PC 3 4 connection laptop 2 7 modem 2 6 connectors 1PPS 1 3 Alarm BITE 1 3 Alarm 58503A 1 3 ANTENNA 1 3 IRIG B 1 3 Programmable Pulse 1 3 time tag 1 3 conventions command syntax 4 22 5 4 Coordinated Universal Time 5 7 CPU 5 89 crossover cable 2 5 current time 4 32 General Index 5 General Index D d dEe 5 14 d dEe 5 14 data 5 114 data bits 2 9 5 124 5 125 5 132 date and time outputs 4 25 4 32 5 8 DB 25 connector 2 5 DB 9 connector 2 5 dc power 1 3 DCE 2 5 dd 5 13 dd 5 13 decimal point 5 8 5 14 default values 3 5 defaults factory 3 5 defaults factory settings 2 9 4 40 5 131 5 132 DEG 5 9 delay values antenna cables 5 30 delay values antenna cables 4 25 5 8 5 30 description response formats ASCII 5 6 serial interface ports 2 3 status registers 5 65 status repor
95. d Note that some bits those which are event only have no transition filter setting Attempts to set these bits are ignored Command Reference 5 48 Command Reference STATus lt register gt NTRansition RESPONSE FORMAT STATus lt register gt PTRansition ey Reads the specified transition filter registers Reading the transition filter registers identifies which condition transitions positive negative either or neither are enabled to report events Expanded Syntax STATus OPERation NTRansition STATus QUEStionable NTRansition STATus OPERation HARDware NTRansition STATus OPERation HOLDover NTRansition STATus OPERation POWerup NTRansition STATus OPERation PTRansition STATus QUEStionable PTRansition STATus OPERation HARDware PTRansition STATus OPERation HOLDover PTRansition STATus OPERation POWerup PTRansition Response The range is 0 to 65535 The response value represents the sum of the binary weighted values of the register The value of unused bits is zero The bits which are set to one in the lt bit mask gt of the NTRansition query response indicate the enabled negative transitions of corresponding conditions The bits which are set to one in the lt bit mask gt of the PTRansition query response indicate the enabled positive transitions of corresponding conditions Theory Reading Querying a transition filter register does not change its contents Command Reference 5 49
96. d Quick Reference Receiver Initialization Receiver Initialization The following commands are provided to allow you to initialize or preset the serial interface port s and the Receiver to their factory shipment values R SYSTem COMMunicate SERial1 PRESet SYSTem COMMunicate SERial2 PRESet 59551A Only SYSTem PRESet R Accessible via Rear panel PORT 1 Command Quick Reference 4 14 Command Quick Reference Receiver Identification Upgrade Receiver Identification Upgrade The commands provided in this section allow you to query the identification of the Receiver and to perform firmware upgrades in the field after you obtain a new firmware disk Reading Product Identification IDN Returns the Receiver identification Installing Firmware via I O Port 1 R CLS DIAGnostic DOWNload lt Motorola S record gt DIAGnostic ERASe DIAGnostic ERASe SYSTem ERRor SYSTem LANGuage INSTALL or PRIMARY SYSTem LANGuage D DD DD D DV Command Quick Reference 4 15 Command Quick Reference Receiver Commands at a Glance Receiver Commands at a Glance GPS Satellite Acquisition Facilitating Initial Tracking GPS INITial DATE lt year gt lt month gt lt day gt GPS INITial POSition lt position gt 1 GPS INITial TIME lt hour gt lt minute gt lt second gt Establishing Position GPS POSition lt position gt 1 GPS POSition GPS POSition ACTual GPS POSition LAST GPS POSition SURVey GPS POSition
97. d following powerup e The Oscillator Oven Warm condition bit 1 is cleared at powerup and set when the internal oscillator has warmed up following powerup e The Date amp Time Valid event bit 2 is cleared at powerup and set when the date and time are set during the first lock is attained after powerup Command Reference 5 39 Command Reference Questionable Status The Time Reset status event bit 0 indicates that the Receiver reset its time because the Receiver s time was found to be different from the time being reported by the satellites This could occur after an extensive holdover period The User reported condition bit 1 indicates the setting reported by the user with the STATus QUEStionable CONDition USER or STATus QUEStionable EVENt USER command This is the only condition in the status alarm reporting that the user can directly affect Command Error Status This group contains events which indicate a command error has occurred and an event which indicates that the power has cycled See Figure 5 1 The following status events indicate that a command error occurred e The Query Error status event bit 2 Errors 400 through 499 are query errors e The Hardware Firmware Error status event bit 3 Errors 300 through 399 are hardware firmware errors e The Semantic Error status event bit 4 Errors 200 through 299 are semantic errors e The Syntactic Error status event bit 5 Errors 100 t
98. e of this guide Command Syntax Conventions POSition Means you MUST use either all the upper case letters or the entire word The lower case letters are optional For example POS and POSITION are both valid However POSI is not valid Note POSition is used here as an example but this convention is true for all command keywords In other words the short form of the keywords is shown in uppercase When you see quotation marks in the command s parameter you must send the quotation marks with the command Command Presentation The shaded commands listed in the following sections are the basic fundamental or most commonly used commands These commands are essential for operating the Receiver thus a brief description of each of these commands is included in this section More complete descriptions are provided in Chapter 5 Command Reference The non shaded commands listed in this section are not fundamental or not commonly used These commands are used for one time setup advanced or specialized operation of the Receiver Descriptions of these commands are provided in Chapter 5 only GPS Satellite Acquisition The following commands are provided to faciliate initial GPS satellite tracking to establish accurate GPS antenna position to select or ignore satellites to compensate for antenna cable delay and to monitor the acquisition Command Quick Reference 4 4 Command Quick Reference GPS Satellite Acquisit
99. e level as the preceding command if no is present immediately after the command separator the semicolon For example sending GPS INIT DATE 1994 7 4 TIME 12 34 56 is equivalent to sending GPS INIT DATE 1994 7 4 GPS INIT TIME 12 34 56 or GPS INIT DATE 1994 7 4 GPS INIT TIME 12 34 56 The must be present to distinguish another root level command For example SYNC HOLD DUR GPS SAT VIS PRED is equivalent to sending SYNC HOLD DUR GPS SAT VIS PRED If the which is following the and is in front of GPS is omitted the Receiver assumes that the second command is SYNC HOLD GPS SAT VIS PRED and generates a syntax error Elements of Response Messages Response Messages Response messages are data sent from the Receiver to the DTE in response to a query A query is a command followed by a question mark Queries are used to find out how the Receiver is currently configured and to transfer data from the Receiver to the DTE After receiving a query the Receiver interrogates the requested configuration and issues its response message as soon as possible The message is transmitted across the serial interface to the DTE Command Syntax and Style B 9 Command Syntax and Style Command Types Format and Elements Response Message Syntax Figure B 4 shows the simplified syntax of a Response Message Response messages may contain both commas and semicolon separators When a single query command
100. e STARt TIME SYSTem PRESet Identifies the time when the individual pulse or first pulse of 0 0 0 the pulse sequence is generated at the Programmable Pulse output ION VOLATILE This command identifies the time when the individual pulse or first pulse of the pulse sequence is generated at the Programmable Pulse output Expanded Syntax PULSe STARt TIME lt hour gt lt minute gt lt second gt Parameter Three fields are separated by commas lt hour gt lt minute gt lt second gt The lt hour gt range is 0 to 23 e The lt minute gt range is 0 to 59 The lt second gt range is 0 to 59 Context Dependencies If you select a date and time which occurs prior to the current time or prior to the completion of powerup and first GPS lock the Receiver will not successfully find a start and therefore will produce no pulses If the Receiver has been set up to use a time zone offset to produce local date and time the parameters provided should also be expressed as local date and time 59551A PULSe STARt TIME RESPONSE FORMAT Returns the time when the individual pulse or first pulse of the dd dd dd pulse sequence is generated at the Programmable Pulse output This query returns the time when the individual pulse or first pulse of the pulse sequence is generated at the Programmable Pulse output Response Three fields are separated by commas lt hour gt lt minute gt lt second gt e
101. e error response format is lt error_number gt lt error_description gt where The lt error_number gt is an integer transferred as ASCII bytes in lt NR1 gt format integer The range is 32768 to 32767 Negative error numbers are defined by the SCPI standard Positive error numbers are defined specifically for this Receiver e An error number value of zero indicates that the Error Queue is empty The maximum length of the lt error_description gt is 255 characters Context Dependencies SYSTem PRESet clears the Error Queue The queue is cleared emptied on CLS power on or upon reading the last error from the queue If the Error Queue overflows the last error in the queue is replaced with the error 350 Queue overflow Any time the queue overflows the least recent errors remain in the queue and the most recent error is discarded The maximum length of the Error Queue is 30 Command Reference 5 31 Command Reference Reading the Diagnostic Log The Diagnostic Log is one way to obtain Receiver status The following activities and events are recorded in the diagnostic log power on sequence e automatic or manual transitions between locked and holdover automatic or manual transitions between position survey and position hold operation alarm indications and self test failures Each entry is date and time tagged The log entries are stored in non volatile memory so all data remains va
102. ed the instrument firmware On subsequent power ons the alarm will not come on Receiver Firmware Installation C 5 Command Index Receiver Firmware Installation C 6 Command Index PORT 1 5 122 5 123 5 124 5 125 5 126 5 127 5 128 5 129 PORT 2 5 122 5 123 5 124 5 125 5 126 5 127 5 128 5 129 x CLS 5 73 5 137 ESE 5 85 ESE 5 86 ESR 5 86 IDN 5 136 SRE 5 76 SRE 5 76 STB 5 77 TST 5 89 CALCulate Subsystem CALCulate WMARgin DATA 4 25 DIAGnostic DOWNload 5 137 ERASe 5 138 ERASe 5 139 LIFetime COUNTt 5 90 LOG CLEar 5 61 CLEar lt current log size gt 5 62 COUNt 5 63 READ ALL 5 62 READ 5 63 READ lt entry number gt 5 64 QUERy RESPonse 5 130 ROSCillator EF Control RELative 5 39 TEST RESult 5 91 GPS TEST 5 90 FORMat DATA 5 115 DATA 5 115 INITial DATE 5 9 POSition 5 10 TIME 5 12 POSition 5 13 ACTual 5 17 HOLD LAST 5 17 STATe 5 19 SURVey PROGress 5 19 STATe 5 20 POWerup 5 21 POWerup 5 22 STATe 5 21 POSition 5 15 REFerence ADELay 5 30 ADELay 5 32 VALid 5 33 SATellite TRACking COUNt 5 35 EMAN gle 5 23 EMAN gle 5 24 IGNore 5 25 ALL 5 25 COUNt 5 28 NONE 5 25 STATe 5 29 IGNore 5 26 INClude COUNt 5 28 STATe 5 29 INCLude 5 27 ALL 5 27 Command Index NONE 5 27 INCLude 5 27 TRACking 5 34 VISible PREDicted COUNt 5 37 P
103. ement that violates the Receiver listening formats or whose type is unacceptable to the Receiver e An unrecognized header was received Unrecognized headers include incorrect Receiver specific headers and incorrect or unimplemented IEEE 488 2 Common Commands Events that generate syntactic errors do not generate semantic errors hardware firmware errors or query errors Semantic Error An lt error number gt in the range 200 to 299 indicates that an error Error Messages A 4 Error Messages has been detected by the Receiver s execution control block The occurrence of any error in this class causes the semantic error bit bit 4 in the Event Status Register to be set One of the following events has occurred A lt PROGRAM DATA gt element following a header was evaluated by the Receiver as outside of its legal input range or is otherwise inconsistent with the Receiver s capabilities A valid program message could not be properly executed due to some Receiver condition Semantic errors are reported by the Receiver after rounding and expression evaluation operations have been taken place Rounding a numeric data element for example is not reported as a semantic error Events that generate semantic errors do not generate syntactic errors hardware firmware errors or query errors Hardware Firmware Error An lt error number gt in the range 300 to 399 or 1 to 32767 indicates that the Receiver has de
104. ents the sum of the binary weighted values of the register The value of unused bits is zero Theory Reading Querying the Alarm Enable Register does not change its contents Command Reference 5 43 Command Reference STB RESPONSE FORMAT Reads the Alarm Condition Register dd This query reads the Alarm Condition Register Figure 5 2 Response The range is 0 to 255 The response value represents the sum of the binary weighted values of the register The value of unused bits is zero Theory The Alarm Condition Register continuously monitors the summary status of the instrument The Alarm Condition Register bits are updated in real time there is no latching or buffering Reading Querying the Alarm Condition Register does not change its contents At powerup the Alarm Condition Register is cleared Command Reference 5 44 Command Reference O Reading and Qualifying Receiver Status Condition Transition Event Register Filter Register a a nd e e e e Summary Continuously monitors Enables condition changes to Latches condition changes Bit i conditions report to Event Register STATus lt register gt EVENt STATus lt register gt CONDition STATus lt register gt PTR STATus lt register gt PTR STATus lt register gt NTR Event STATus lt register gt NTR Enable Register positive transition or y negative transition or i either transition or neither tr
105. er identification Response A sequence of ASCII encoded bytes HEWLETT PACKARD 59551A XXXXYZZZZZ WWWW V where 59551A is the product model number XXXXYZZZZZ is the product serial number and WWWW is the product s firmware revision date code and V is the hardware revision letter In the product serial number XXXXYZZZZZ XXXX is a four digit prefix that identifies a series of instruments Command Reference 5 89 Command Reference Y identifies the country in which the instrument was manufactured e g the A in 3426A000123 stands for America ZZZZZ is a five digit suffix that identifies a particular instrument within a series For example HEWLETT PACKARD 59551A 3426A00123 3422 A This query should be the last query in a terminated program message otherwise error 440 is generated Context Dependencies Preparatory to installation of new product firmware the instrument is switched to the INSTALL language available only on PORT 1 The INSTALL language includes an IDN query which returns the revision identification for the installation firmware The response format is the same as described above for the instrument s PRIMARY language but the identification code may be different The commands in this section represent the command set of the INSTALL language The INSTALL language is part of a highly specialized set of features used to erase the Receiver
106. ernal reference oscillator This oscillator is synchronized phased locked to GPS while a sufficient number of satellites are tracked When the GPS signal is interrupted or absent the Receiver maintains timing and frequency accuracy through its oscillator holdover process While in holdover the frequency of the reference oscillator is adjusted as necessary to compensate for aging characteristics The Receiver returns to locked operation through a holdover recovery process The following commands are provided to monitor the operating mode of the reference oscillator to determine the accuracy and stability of the reference output signal s and to control the oscillator holdover process E Monitoring 1 PPS Synchronization SYNChronization STATe DIAGnostic ROSCillator EFControl RELative LED GPSLock LED HOLDover E Assessing 1 PPS Quality SYNChronization FFOMerit SYNChronization HOLDover TUNCertainty PREDicted SYNChronization HOLDover TUNCertainty PRESent SYNChronization TFOMerit SYNChronization TINTerval SYNChronization HOLDover DURation SYNChronization HOLDover DURation THReshold SYNChronization HOLDover DURation THReshold SYNChronization HOLDover DURation THReshold EXCeeded E Operating in Holdover O Initiating Manual Holdover SYNChronization HOLDover INITiate O Recovering from Holdover SYNChronization HOLDover WAITing SYNChronization HOLDover RECovery INITiate SYNChroniz
107. error currently expected IN o HOLD THR Holdover Threshold 1PPS phase difference that while exceeded forces holdover Tgpmre operation Wot GK Visual User Interface 3 17 Visual User Interface Receiver Status Outputs Valid Reduced Accuracy Reference Outputs TFOM 3 FFOM 2 1PPS TI HOLD THR 1 000 us Holdover Uncertainty Predict 55 8 us imitial 24 hrs Present 1 0 us GPS 1PPS Valid si me Az PRN El Az yre 03 11 57 31 Jan 1996 29 Not OK GPS 1PPS Synchronized to UTC ANT DLY 120 ns Positiom MODE Survey 26 1 complete Suspended track lt 4 sats AVG LAT N 37 19 31 797 AVG LON W 121 59 52 018 AVG HGT 60 52 m GPS OK Oven Pwr OK OCXO OK EFC OK GPS Rcv OK Tracking Satellites currently tracked by the receiver Four or more satellites must be tracked to determine position Timing information is derived from all tracked satellites and is considered accurate while tracking at least one satellite from a known position The receiver selects satellites highest in the sky that are at or above the minimum elevation angle specified by ELEV MASK Not Tracking Satellites considered for tracking These satellites are predicted to be visible or are selected by the sky search algorithm Visibility is predicted from the satellite almanac current time and position Tracking and Not Tracking table
108. error types 5 4 error types list 5 4 error command 5 65 5 72 error reading 5 2 external devices 1 3 F factory default settings 2 9 3 5 4 40 5 131 5 132 factory default values 2 9 failure of merit 4 27 failure protection satellite loss 4 27 5 38 5 46 5 47 5 48 FDUPlex 5 125 5 126 FFOM 4 27 5 41 Figure command list 4 2 status reporting system 5 68 figure of merit 5 41 5 44 5 93 firmware error 5 5 firmware installation 2 3 4 42 5 135 5 137 5 139 5 140 5 141 firmware revision code 2 3 4 42 5 136 firmware upgrade 2 3 5 137 FIRS 5 121 flash EEPROM 5 138 flow control state 5 126 5 127 format ASCui 5 115 INTeger 5 115 FPGA logic 5 89 front panel PORT 2 2 4 full duplex 2 9 5 132 Command Index 6 G GPS engine 5 89 GPS lock 4 23 4 25 5 7 5 46 5 47 5 48 GPS Lock indicator 1 2 4 27 5 40 GPS position 4 23 5 7 5 13 5 15 5 17 5 19 GPS satellite acquisition 4 23 4 25 5 7 5 46 5 47 5 48 GPS timeline 5 92 GUI 3 3 3 8 3 9 3 10 H hardware status 5 70 5 79 5 80 5 81 5 82 5 83 5 84 Hardware status 5 65 5 70 hardware firmware error 5 5 holdover status 5 65 holdover tutorial 3 15 Holdover indicator 1 2 4 27 5 40 holdover loss of satellites 4 27 holdover operation 3 15 holdover process 5 38 holdover recovery 4 27 5 38 5 50 holdover status 4 30 5 71 How to use the Status Screen 3 10 HP 24542G cable 2 8 HP 24
109. esolution is 1 second If the Receiver is in holdover the response quantifies the current holdover duration If the Receiver is not in holdover the response quantifies the previous holdover The second number in the response identifies the holdover state A value of 0 indicates the Receiver is not in holdover a value of 1 indicates the Receiver is in holdover Command Reference 5 25 Command Reference Context Dependencies This query is always valid If this query is sent before the first holdover has occurred the response will be 0 0 indicating that the Receiver is currently not in holdover and last holdover duration was 0 seconds user infers there has not been one yet Set to 0 0 after a SYSTem PRESet If there was a prior holdover the duration will be lost SYNChronization HOLDover DURation THReshold SYSTem PRESet Sets the duration in seconds to be used as a limit each time 86400 holdover begins i e 1 day ION VOLATILE This command sets the duration in seconds which represents a limit against which the elapsed time of holdover is compared If the elapsed time in holdover and associated processes exceeds the limit a flag is set The flag indicating the limit is exceeded can be queried using the SSYNC HOLD DUR THR EXCeeded query Expanded Syntax SYNChronization HOLDover DURation THReshold lt seconds gt Parameter Resolution of the lt seconds gt parameter is 1 second SYNChronization HOL
110. estimate of the time interval error that can be expected for a one day holdover given the current state of SmartClock learning in the Receiver Response The first number in the response is the estimated time interval error The units are seconds the resolution is 100 nanoseconds The second number in the response identifies the holdover state A value of 0 indicates the Receiver is not in holdover a value of 1 indicates the Receiver is in holdover Context Dependencies This query is not valid prior to first lock following powerup see bit 2 of the Powerup Status Register or SYSTem PRESet Sending this query before first lock will generate error 230 SYNChronization HOLDover TUNCertainty PRESent RESPONSE FORMAT Returns the current time interval error during holdover d dEe operation given the current state of SmartClock learning in the Receiver This query returns the current time error during holdover operation given the current state of SmartClock learning in the Receiver Response The time error units are seconds Context Dependencies This query is valid when the Receiver is in holdover If not in holdover error 230 is generated SYNChronization TFOMerit RESPONSE FORMAT Returns the Time Figure of Merit dd This query returns the Time Figure of Merit Use this query when you want to know the accuracy of the Receiver s 1 PPS output A low TFOM value indicates a more accurate output A value of 3 indicates tha
111. ether the Programmable Pulse output is set to Oor1 output a single pulse or a sequence of pulses This query identifies whether the Programmable Pulse output is set to output a single pulse or a sequence of pulses Response A value of 0 indicates the Receiver is set to output one pulse A value of 1 indicates the Receiver is set to output a sequence of pulses Command Reference 5 66 Command Reference 59551A PULSe REFerence EDGE SYSTem PRESet Selects the polarity of the Programmable Pulse on time edge RISing ION VOLATILE This command selects the polarity of the Programmable Pulse on time edge Expanded Syntax PULSe REFerence EDGE RISing or FALLing Parameter The RISing parameter sets the Programmable Pulse rising edge as the on time edge The FALLing parameter sets the Programmable Pulse falling edge as the on time edge 59551A PULSe REFerence EDGE RESPONSE FORMAT Returns the polarity of the Programmable Pulse on time edge XYZ This query returns the the polarity of the Programmable Pulse on time edge Response RIS indicates that the Programmable Pulse on time edge is the rising edge FALL indicates that the Programmable Pulse on time edge is the falling edge Command Reference 5 67 Command Reference 59551A PULSe STARt DATE SYSTem PRESet Identifies the date when the individual pulse or first pulse of 1994 1 1 the pulse sequence is generated at the Programmable Pulse outp
112. ex BITS 5 124 BITS 5 125 FDUPlex 5 125 FDUPlex 5 126 PACE 5 126 PACE 5 127 PARity 5 127 PARity 5 128 PRESet 5 132 SBITs 5 129 SERial1 SBITs 5 128 COMMunicate 5 123 DATE 5 95 ERRor 5 57 5 139 LANGuage 5 140 LANGuage 5 141 PRESet 5 132 STATus LENGth 5 56 STATus 5 55 TIME 5 95 SYSTEM STATUS query 3 3 lt lt numeric value gt 5 8 1 1 PPS reference edge 4 32 10MHz output 5 38 10MHz output quality 4 27 4 32 5 38 5 39 5 40 5 41 5 42 5 43 5 44 5 45 5 46 5 47 5 48 1PPS connector 58503A 1 3 1PPS connector 59551A 1 3 1PPS error estimation 5 42 1PPS output 1 3 5 38 1PPS output quality 4 27 4 32 5 38 5 39 5 40 5 41 5 42 5 43 5 44 5 45 5 46 5 47 5 48 1PPS polarity 4 32 5 98 1PPS reference synchronization 4 27 5 38 A abbreviated commands 5 7 ac power 1 3 accessing the Receiver Status Screen 3 8 acquisition satellite 4 23 5 7 acquisition of satellites 4 25 5 8 alarm analysis 4 29 5 53 5 54 5 65 5 66 5 68 5 70 5 71 5 72 5 73 5 74 5 75 5 76 5 77 5 78 5 79 5 80 5 81 5 82 5 83 5 84 5 85 5 86 5 87 5 88 alarm BITE 4 29 5 53 5 65 5 68 5 70 5 71 5 72 5 73 5 75 5 76 5 77 5 78 5 79 5 80 5 81 5 82 5 83 5 84 5 85 5 86 5 87 5 88 Alarm BITE 59551A 1 3 alarm clear 4 29 5 53 5 73 5 74 5 75 5 76 5 77 Alarm indicator 1 2 1 3 1 2 4 29 5 53 5 75
113. f certain settings System preset Indicates that the Receiver has been preset to factory settings Hardware failure Indicates that a hardware failure has been detected See Hardware Status Register for details EEPROM save failed Indicates that an attempt to save information to the EEPROM has failed The DIAGnostic commands for the log are described in the following text Holdover started Indicates transition to holdover for any reason not covered above Self test failed Indicates self test failed on powerup DIAGnostic LOG CLEar SYSTem PRESet Clears the diagnostic log pana ION VOLATILE This command is an event that removes all previous diagnostic log entries and effectively sets the number of diagnostic log entries to one DIAGnostic LOG READ ALL RESPONSE FORMAT Returns all of the most recent diagnostic log entries XYZ This query returns all of the most recent diagnostic log entries DIAGnostic LOG CLEar SYSTem PRESet Clears only the current diagnostic log aoe ION VOLATILE This command clears the diagnostic log The optional log count parameter is provided to ensure that no log entries are unread at the time of the clear Expanded Syntax DIAGnostic _LOG CLEar lt current log size gt Parameter If the value sent for the optional log parameter does not match the current log entry count use DIAG LOG COUN to obtain this number the clear will not take place Command Reference 5
114. ffix NOTE sp space ASCII character decimal 32 Figure B 2 Simplified Program Command Syntax Diagram Command Syntax and Style B 4 Command Syntax and Style Command Types Format and Elements Abbreviated Commands The command syntax shows most keywords as a mixture of upper and lower case letters Upper case letters indicate the abbreviated spelling for the command For better program readability you may send the entire keyword The Receiver accepts either command form and is not case sensitive For example if the command syntax shows SYNChronization then SYNC and SYNCHRONIZATION are both acceptable forms Other forms of SYNChronization such as SYNCHR or SYNCHRONIZ will generate an error You may use upper and or lower case letters Therefore SYNCHRONIZATION synchronization SyNchROnizatioN and SYnC are all acceptable Keyword Separator A colon always separates one keyword from the next lower level keyword as shown below SYST ERR Command Syntax and Style B 5 Command Syntax and Style Command Types Format and Elements Parameter Data Types Table B 1 contains explanations and examples of parameter types Parameter types may be numeric value Boolean literal NRf string or non decimal numeric Table B 1 Command and Query Parameter Types TYPE EXPLANATIONS AND EXAMPLES lt numeric value gt Accepts all commonly used decimal representation of numbers including optional signs decimal points and scientific
115. ffset identifies a default power up setting that is corrected when the first satellite is tracked 1 or 1 leap second pending is reported if a leap second correction to UTC is pending GPS 1PPS indicates the validity of the GPS 1PPS reference Synchronized to UTC or GPS Time 1PPS reference is synchronous with GPS Questionable accuracy Assessing stability 1PPS must be accurate for 35 seconds Inaccurate not tracking One or more satellites must be tracked Inaccurate inacc position Postition must be known to derive time Inaccurate Time RAIM err GPS timing integrity is suspect ANT DLY offsets the GPS 1PPS reference to compensate for signal propagation delays introduced by the antenna system Time is referenced to the position of the antenna Position An accurate position is necessary to transfer time from GPS Two position MODEs are provided hold and survey In Hold mode a fixed position is used to derive time This position may be specified if known or determined by the survey process In Survey mode position is determined from GPS Four or more satellites must be tracked Successive positional estimates pseudoranges are refined to obtain the true position which is entered as the held position at the completion of this process Averaged AVG position coordinates and progress are reported while surveying When surveying is suspended an advisory message describes the reason
116. form of the Receiver Status Screen is displayed The program will send some commands to the GPS Receiver and then the main form should begin to periodically update every few seconds If you are getting screen updates proceed to the next step Otherwise something is wrong with your CommPort settings or perhaps the physical connection between your PC and the GPS Receiver If you need to control the Receiver or query for the status of a setting of the Receiver use the Control amp Query form To activate this form click anywhere on it Select Control or Query then choose the type of control or query you want This will pull down a list of control or query functions that you can choose from and the corresponding command will be displayed To send the command click on Send Cmd Hence with the Control amp Query form you can control the Receiver without knowing the command or query More information about the Windows program is provided in the Getting Started Help file Refer to the section titled Using and Reading the Receiver Status Screen on page 3 10 for a tutorial and demonstration of what to look for when viewing the status screen Visual User Interface 3 9 Visual User Interface Using and Reading the Receiver Status Screen As mentioned earlier in this chapter the Receiver Status Screen can be accessed when the Receiver is connected to a properly configured PC There are two ways to access and use the Receiver
117. fying Time of Next 1 PPS Reference Edge R PTIMe TCODe Returns timecode message 980 to 20 ms prior to 1 PPS of indicated time Reading Current Time PTIMe DATE or SYSTem DATE PTIMe TIME or SYSTem TIME PTIMe TIME STRing Applying Local Time Zone Offset PTIMe TZONe lt hours gt lt minutes gt Sets the time zone local time offset to provide an offset from UTC to serve as the basis for all reported time PTIMe TZONe Returns the local time zone offset Defining the 1 PPS Reference Edge 59551A Only PTIMe PPS EDGE RISing or FALLing Selects the polarity of the 1 PPS on time edge PTIMe PPS EDGE Returns the polarity of the 1 PPS on time edge Reading Leap Second Status PTIMe LEAPsecond ACCumulated Returns the leap second difference accumlulated between GPS time and UTC time since the beginning of GPS time The time units are seconds PTIMe LEAPsecond DATE PTIMe LEAPsecond DURation PTIMe LEAPsecond STATe R Accessible via rear panel PORT 1 Command Quick Reference 4 10 Command Quick Reference Programmable Pulse Output 59551A Only Programmable Pulse Output 59551A Only The following commands are provided to allow you to operate and control the programmable pulse output of the 59551A GPS Receiver The pulse output which is programmable by the user can either generate a stream of pulses at a specified start time and repetition interval or can produce a single pulse at a specified time and then
118. g an Error Error Queue Error Types No Error Syntactic Error Semantic Error Hardware Firmware Error Query Error General Error Behavior List of Errors Appendix B Command Syntax and Style Appendix Contents Command Types Format and Elements Command Types Command Formats Common Command Format 72 76 79 85 89 Oa RAR ww Ww Ww vii Contents SCPI Command and Query Format Elements of SCPI Commands Common Command Syntax Subsystem Command Syntax Abbreviated Commands Keyword Separator Parameter Data Types Parameter Separator Query Parameters Suffixes Suffix Elements Suffix Multipliers Command Terminator Using Multiple Commands Program Messages Program Message Syntax Elements of Response Messages Response Messages Response Message Syntax Response Formats Appendix C Receiver Firmware Installation Reference Documentation Downloading New Firmware Using SatStat Program viii BOO DOWDAMWMAAANNDAADA nA ns Pb wo In This Guide Chapter 1 Front and Rear Panels at a Glance provides overview of the Receiver s indicators inputs and outputs Chapter 2 Serial Interface Capabilities provides RS 232 serial interface port connection and configuration instructions Chapter 3 Visual User Interface which is subtitled Using the Receiver and Status Screen provides information on how to use the Receiver Status screen and the SatStat program An i
119. gister is enabled sets the User reported bit of the Questionable Event register Side Effects The user reported bit of the Questionable Condition Register is set by the PTRansition parameter or cleared by the NTRansition parameter Theory A positive or negative PTRansition or NTRansition of the User reported bit of the Questionable Condition Register and the appropriate configuration of the Questionable Transition Filter is necessary to generate an event in the Questionable Event Register Furthermore when the User reported bit of Questionable Event Enable Register is enabled and the Questionable Summary bit of the Alarm Enable Register is enabled then a User reported event will generate an ALARM Command Reference 5 53 NOTE Command Reference Assessing Receiver Health TST RESPONSE FORMAT Executes an internal selftest and reports the results dd This query causes an internal selftest and the response indicates whether any errors were detected This test takes about 40 seconds to complete Error 330 Self test failed is generated if the selftest fails Manual operation of internal self test diagnostics will affect normal Receiver operation including disruption of any or all of the following GPS satellite tracking reference oscillator frequency 1 PPS output timing and Receiver status information When invoked manually any of these diagnostics should be considered to be destructive tests The foll
120. gram The program is easy to install and operate Insert the SatStat disk in drive A From the File menu in either the Program Manager or File Manager choose Run Type a setup and click OK or press Enter Return The SatStat Setup screen will appear and installation will proceed Once the program is installed you can start it by double clicking the SatStat icon that was created during the installation Visual User Interface 3 8 5 Visual User Interface You should establish communication with the GPS Receiver This requires connection from a serial RS 232C port on your PC to the GPS Receiver s serial port a 25 pin RS 232C connection Assuming you ve got the cable attached to make this connection you may want to check the settings a Select CommPort then choose Settings The Communication Settings dialog box is displayed Unless someone has reprogrammed the CommPort settings on the GPS Receiver these settings are probably OK The one setting that is likely to need changing is the Com Port The application defaults it to Com1 but the serial port on your PC may be assigned to a different Com Port Select the appropriate setting If you are unsure Com1 will be your best bet worst case you can cycle through all of them until it works b If you made any changes on this Settings form select OK otherwise you can just Cancel To Operate the Automated SatStat Program Select CommPort then choose Port Open The main
121. group Powerup Holdover and Hardware summaries Locked Position Hold 1 PPS Reference Valid and Log Almost Full status e The Powerup Summary condition bit 0 reflects one or more latched condition changes in the Powerup status group e The Locked condition bit 1 indicates whether or not the Receiver is locked to GPS e The Holdover Summary condition bit 2 reflects one or more latched condition changes in the Holdover status group e The Position Hold condition bit 3 indicates whether the Receiver is in position hold or survey mode e The 1 PPS Reference Valid condition bit 4 indicates that the GPS 1 PPS signal is suitable to use as a locking reference e The Hardware Summary condition bit 5 reflects one or more latched condition changes in the Hardware status group e The Log Almost Full condition bit 6 indicates whether or not the diagnostic log is approaching the point where new entries will no longer be logged Hardware Status This Operation subgroup comprises operating status that indicates the health of the Receiver hardware One or more of the condition changes from this group are summarized in the Operation Status group The Selftest Failure condition bit 0 indicates whether a failure was detected during the powerup or last user initiated self test The following conditions reflect the status of specific hardware that is continuously monitored by the Receiver 15V Supply Exceeds Tolerance
122. gt PRESet Sets the specified port configuration to its factory default EVENT values This command is an event that sets specified port parameters to their factory default values Expanded Syntax SYSTem COMMunicate SERial1 PRESet SYSTem COMMunicate SERial2 PRESet PORT 1 Configuration Factory Default Values Software Pacing NONE XON or NONE 9600 1200 2400 9600 or 19200 Data Bits or Full Duplex JON ON OFF PORT 2 Configuration Factory Default Values 59551A Only NONE XON or NONE 9600 1200 2400 9600 or 19200 NONE EVEN ODD NONE or ONE e p rema Fixed at 8 when parity is none Ful Duplex ON JON OFF Context Dependencies The SERiall preset command only is valid if transmitted on the rear panel PORT 1 SYSTem PRESet Restores the Receiver parameters settings to their EVENT factory default values This command is an event that restores the Receiver parameters settings to their factory shipment or factory default values see the following Table 5 2 NOTE Issuing this command will result in disruption of all of the following GPS satellite tracking reference oscillator frequency 1 PPS output timing and Receiver status information Command Reference 5 86 Command Reference Table 5 2 System Preset Factory Default Parameter Settings Summary a T A 136 NV DIAGnostic LOG CLEar Log is cleared DIAGnostic LOG COUNt DIAGnostic QUERy RESPonse FORMat DATA ASCII NV GPS POSi
123. he date when Command Mnemonic Consult Appendix B Command Syntax and Style for notational style Allowed Values Range and Resolution When the command may be issued Secondary effects on other functions Concepts the pulse sequence is generated at the Expanded Syntax Parameter in The lt four digit year gt range is 1994 tq The lt month gt range is 1 to 12 The lt day gt range is 1 to 31 Context Dependencies J If you select a date and time which occ the completion of powerup and first G successfuly find a start and therefore If the Receiver has been set up to use a t and time the parameters provided shoul time SYSTem PRESet sets the date to January Side Effects I Theory PULSe STARt DATE lt four digit year SYSTem PRESet 1994 1 1 NON VOLATILE Command Reference 5 4 Command Reference Query Specific Information Response Format Refer to the following section titled Description of Response Formats ASCll encoded for more information 59551A L f PULSe STARt DATE RESPONSE FORMAT Returns the date when the individual pi the pulse sequence is generated at th dd output This query returns the date when the i pulse sequence is generated at the Pro returns year month and day Response Three fields are separated by commas lt I Respo
124. holdover as indicated by gt gt marker that is pointing at the Holdover line The status screen indicates that the reason the Receiver is in holdover is because the GPS 1 PPS reference signal is invalid You would expect this since the antenna has been disconnected The status screen shows instantaneously loss of the GPS signal As you can see on the screen all of the satellites in the Tracking column moved into the Not Tracking column The status screen in Figure 3 6 shows that the Receiver has been in holdover operation for 14 seconds If the Receiver SmartClock had had enough time to learn the internal oscillator characteristics 24 hours the Receiver status screen would show that the Receiver went into holdover and the Receiver s outputs were maintained during holdover by the SmartClock When the GPS antenna is re connected and the GPS signal has been re acquired the Receiver has the ability to recover from holdover by itself The SYNCHRONIZATION area of the screen will show the gt gt marker pointing at the Recovery line and then eventually at the Locked to GPS line the GPS Lock LED will illuminate and the screen will look similar to Figure 3 7 Figure 3 7 Receiver Status Screen Following Recovery from Holdover Operation You can see the Receiver has recovered from holdover almost immediately and it has returned to locked operation Visual User Interface 3 16 Visual User Interface The Receiver Status Screen at a G
125. hrough 199 are syntactic errors e The Power Cycled status event bit 7 is set at powerup O Clearing and Presetting Alarms CLS Clears the current alarm and prepares the Receiver for the EVENT next alarm activation When the CLS command clears the event status registers and error queue the Receiver s Alarm LED and Alarm BITE output will no longer indicate that there was a reason to alarm Furthermore the Receiver is then ready to detect a new alarm Command Reference 5 40 Command Reference Context Dependencies In the 59551A the error queue and corresponding serial port prompt of the I O port which transmitted CLS will be cleared Side Effects The Alarm LED is extinguished The Alarm BITE output is set inactive off The prompt of the serial I O port which transmits CLS reflects error queue clearing The event status registers are cleared The error queue and corresponding serial port prompt of the I O port which transmitted CLS will be cleared Theory The CLS command clears the event status registers and error queue They are also cleared at power up Since the Alarm Condition register summarizes the event registers it is cleared as a result of the clearing of all of the event registers The alarm remains active even after the condition that caused it has gone away If the condition that caused the alarm to occur is still set a new alarm cannot be detected until the condition clears
126. ications Equipment Equipment PC 24542U or F1015 80002 PORT 2 RS 232 9 pin Interface Cable Adapter RS 232 9 pin 1 1 1 1 PC input RXD 2 7 2 2 2 RXD Instrument input PC output TXD 3 3 3 3 TXD Instrument output 4 4 4 4 GND 5 gt lt 5 5 5 GND 6 6 6 6 eA Was i 8 8 8 8 9 9 9 9 DE 9P DE 9S DE 9S DE 9P DE 9P DE 9S Male Female Female Male Male Female Figure 2 5 DB 9 to DB 9 Serial Connection Data Data Terminal Communications Equipment DE 9S to DE 9P Equipment PC DTE to DCE Interface Cable 59551A PORT 2 RS 232C 9 pin RS 232C 9 pin 1 1 PC input RX 2 2 RX Instrument input PC output gt TX 3 a 3 TX Instrument output 4 4 GND 5 5 GND 6 6 7 7 8 8 9 9 DE 9P DE 9S DE 9P DE 9S Male Female Male Female Figure 2 6 DB 25 to DB 9 Serial Connection Serial Interface Capabilities 2 8 Serial Interface Capabilities Configuring the RS 232C Port s The 59551A has separate rear panel PORT 1 and front panel PORT 2 RS 232C serial interface ports The 58503A has one RS 232C serial interface port PORT 1 on the rear panel Software pacing baud rate parity data bits and stop bits parameters for each port are user selectable and independent of the configuration of the other Tables 2 3 and 2 4 list the configuration factory default values for PORT 1 and PORT 2 respectively Table 2 3 PORT 1 Configuration Factory Default Values Default Possible Choices
127. ies Table 2 1 PORT 1 Rear Panel RS 232C Serial Port Connections Pin Input Output Description Number Output Transmit Data TxD GPS Receiver output Receive Data RxD GPS Receiver input Refer to the sections titled Connecting a Computer or Modem in this chapter on page 2 5 for wiring diagrams and more information on the RS 232C interface cables PORT 2 Front Panel RS 232C Serial Port 59551A Only This 9 pin female subminiature D DB 9 connector PORT 2 RS 232C Serial Interface Port located on the front panel The pins used for PORT 2 RS 232C communication are described in Table 2 2 NOTE Manufacturing reserves the right to impose signals on other pins therefore your connection should be restricted to the pins described in Table 2 2 Table 2 2 PORT 2 Front Panel RS 232C Serial Port Connections 59551A Only Pin Input Output Description Number Receive Data RxD GPS Receiver input Output Transmit Data TxD GPS Receiver output Refer to the sections titled Connecting a Computer or Modem in this chapter on page 2 5 for wiring diagrams and more information on the RS 232C interface cables Serial Interface Capabilities 2 4 Serial Interface Capabilities Connecting a Computer or Modem To connect the GPS Receiver to a computer or modem you must have the proper interface cable Most computers are DTE Data Terminal Equipment devices Since the Receiver is also a DTE device you mu
128. ified event register figures 5 3 and 5 1 retrieving information about what has happened to the instrument since it was last queried or cleared by SYSTem PRESet or CLS Expaned Syntax STATus OPERation EVENt STATus QUEStionable EVENt STATus OPERation HARDware EVENt STATus OPERation HOLDover EVENt STATus OPERation POWerup EVENt Response The range is 0 to 65535 The response value represents the sum of the binary weighted values of the register The value of unused bits is zero Side Effects Reading Querying an event register clears it Theory An event register captures changes in conditions When a transition occurs the corresponding bit in the event register is set TRUE The instrument can be configured using STATus lt register gt NTRansition and STATus lt register gt PTRansition for each bit position to capture the positive the negative either or neither transition Event register bits once set are latched That is they remain set until they are read When they are read they are cleared Command Reference 5 46 Command Reference At powerup the event registers are cleared See Also STATus lt register gt NTRansition STATus lt register gt PTRansition STATus lt register gt ENABle SYSTem PRESet a 2 ee Figure 5 1 for Default Sets the specified enable register ee ae ae ON VOLATILE The setting of an enable register figures 5 3 and 5 1 selects whi
129. ile let s put the Receiver into holdover by simply removing the antenna connection Note that holdover also can be manually initiated by sending the SYNCHRONIZATION HOLDOVER INITIATE command however for this demonstration disconnect the antenna cable The following will occur The front panel Holdover LED will illuminate and e after sending the SYSTEM STATUS query again a screen similar to Figure 3 6 should appear Let s send the SYSTEM STATUS query Figure 3 6 should appear Visual User Interface 3 15 Visual User Interface Receiver Status SYNCHRONIZATION Outputs Valid SmartClock Mode Reference Outputs gt gt Locked to GPS TFOM 3 FFOM 0 Recovery 1PPS TI 7 2 ns relative to GPS Holdover HOLD THR 1 000 us Power up Holdover Uncertainty Predict 49 0 us initial 24 hrs ACQUIS GPS 1PPS Valid Tracking 6 ___ Not Tracking PRN El Az C N PRN El Az 1 leap second pending 2 49 243 49 14 11 82 UTC 23 59 59 31 Dec 1995 282 46 GPS 1PPS Synchronized to UTC 154 47 ANT DLY 120 ns 52 49 Position 327 49 MODE Survey 17 5 complete 61 47 AVG LAT N 37 19 32 264 AVG LON W 121 59 52 112 ELEV MASK 10 deg AVG HGT 41 86 m GPS HEALTH MONI OK Self Test OK Int Pwr OK OCXO OK EFC OK GPS Rev OK Figure 3 6 Receiver Status Screen Displaying Holdover Operation In the SYNCHRONIZATION area you can see that the Receiver has gone into
130. ing data not allowed A string data element was encountered but was not allowed by the Receiver at this point in parsing Expression error This error can be generated when parsing an expression data element It is used if the Receiver cannot detect a more specific error Expression data not allowed Expression data was encountered but was not allowed by the Receiver at this point in parsing Execution error This is the generic syntax error if the Receiver cannot detect more specific errors 200 i i Pe epee sy detect more specific errors i oR l eee leer current Receiver state Ne pramono Mian vaia i ote tne legat range defra By etc interpreted value is outside the legal range defined by the Receiver Too much data Indicates that a legal program data element of block expression or string type was received that contained more data than the Receiver could handle due to memory or related receiver specific requirements 170 178 200 220 221 222 223 230 240 241 300 311 360 361 362 363 Hardware missing Indicates that a legal program command or query could not be executed because of missing Receiver hardware D i This is the generic device dependent error M Hardware error Indicates that a legal program command or query could not be executed because of a hardware problem in the Receiver Self test failed ndicates at least one failure occurred when TST or DIAG TEST was executed An error occur
131. install of the PRIMARY Receiver ION VOLATILE This command switches the operation mode primary or install of the Receiver Expanded Syntax SYSTem LANGuage INSTALL or PRIMARY Parameter The INSTALL language is part of a highly specialized set of features used to erase the Receiver s firmware and to install a new firmware revision It should be selected only when firmware installation is required The INSTALL language offers the limited number of commands and queries which are documented in this section This set is designed to provide the Receiver status and control capability required during firmware upgrade NOTE The SatStat program provides a Service menu which automates firmware installation The PRIMARY language provides the capabilities required for normal Receiver operation If the INSTALL language has been selected as part of the firmware upgrade the PRIMARY language should be selected after the upgrade to restore normal operation Command Reference 5 92 Command Reference SYSTem LANGuage RESPONSE FORMAT Identifies the operation mode primary or install of the xyz Receiver This query identifies the operation mode primary or install of the Receiver Response INSTALL or PRIMARY is returned Command Reference 5 93 R Command Reference Command Reference 5 94 Error Messages Error Messages Introduction This appendix explains h
132. ion Facilitating Initial Tracking GPS INITial DATE lt four digit year gt lt month gt lt day gt GPS INITial POSition N or S lt atitude degree gt lt latitude minute gt lt latitude second gt E or W lt ongitude degree gt lt longitude minute gt lt longitude second gt lt height above mean sea level in meters gt GPS INITial TIME lt hour gt lt minute gt lt second gt Establishing Position GPS POSition N orS lt l atitude degree gt lt latitude minute gt lt latitude second gt E orW lt longitude degree gt lt longitude minute gt lt longitude second gt lt height above mean sea level in meters gt Specifies the position of the GPS antenna GPS POSition Returns the current average position of the GPS antenna GPS POSition ACTual Returns the current instantaneous position of the GPS antenna GPS POSition LAST GPS POSition SURVey GPS POSition HOLD LAST GPS POSition HOLD STATe GPS POSition SURVey PROGress GPS POSition SURVey STATe ONCE GPS POSition SURVey STATe GPS POSition SURVey STATe POWerup ON or OFF GPS POSition SURVey STATe POWerup Command Quick Reference 4 5 Command Quick Reference GPS Satellite Acquisition Selecting Satellites lt select gt GNore or INCLude GPS SATellite TRACking EMANgle lt degrees gt Sets the GPS elevation mask angle value GPS SATellite TRACking EMANgle Returns the GPS elevation mask angle value GPS
133. is query identifies whether date and time are valid Returns 0 or 1 1 indicates date and time are valid This is the same as bit 2 in the Powerup Status Register This command makes it convenient to check whether the date and time are valid without checking the Powerup Status Register Response A value of 1 indicates date and time are valid A value of 0 indicates date and time are not valid GPS SATellite TRACking RESPONSE FORMAT Returns a list of all satellites being tracked tdd This query returns a list of all satellites being tracked Each satellite is identified by its pseudorandom noise code PRN Response A comma separated list of satellite pseudorandom noise codes lt PRN gt The range of each lt PRN gt is 1 to 32 A response of 0 indicates no satellites being tracked GPS SATellite VISible PREDicted RESPONSE FORMAT Returns the list of satellites PRN that the almanac predicts dd should be visible given date time and location This query returns the list of satellites PRN that the almanac predicts should be visible given date time and location if any of these values are incorrect the prediction will be incorrect Each satellite is identified by its pseudorandom noise code PRN Response A comma separated list of satellite pseudorandom noise codes lt PRN gt The range of each lt PRN gt is 1 to 32 Command Reference 5 19 Command Reference A response of 0 indicates n
134. ition of the GPS antenna XYZ or dd or d dEe This query returns the current instantaneous position of the GPS antenna Response Returns a list of values defining the Receiver position N or S lt latitude degree gt lt latitude minute gt lt latitude second gt E or W lt longitude degree gt lt longitude minute gt lt longitude second gt lt height above mean sea level in meters gt Context Dependencies Error 230 is generated if in survey and first calculation has not occurred GPS POSition HOLD LAST RESPONSE FORMAT Returns the last position hold setting XYZ or dd or d dEe This query returns the last position hold setting which is restored when the GPS POSition LAST command is sent Refer to the description of the GPS POSition command on page 5 10 for details Command Reference 5 10 Command Reference Response Returns a list of values defining the Receiver position N or S lt latitude degree gt lt latitude minute gt lt latitude second gt E or W lt longitude degree gt lt longitude minute gt lt longitude second gt lt height above mean sea level meters gt Context Dependencies This query is always valid but if the Receiver has not been in position hold mode since it was preset see SYSTem PRESet the value returned will be the preset position GPS POSition HOLD STATe RESPONSE FORMAT Identifies whether the Receiver is in position hold or survey Oor1 mode This
135. lance amp SYNCHRONIZATION Receiver Status SYNCHRONIZATION profiles the process of synchronizing time and frequency reference signals with GPS SmartClock technology compares and adjusts locks the reference oscillator to GPS In the absence of GPS Smart Clock operates in holdover mode which maintains precise time and frequency over an extended duration by predicting and compensating for aging and temperature effects SmartClock Mode Locked to GPS Reference signals are synchronous with GPS When stabilizing frequency is reported short term frequency errors limit the accuracy of the 10 MHz reference Recovery Adjusting the frequency and phase of the oscillator to correct errors accrued while in holdover operation The phase difference between the GPS 1PPS reference and disciplined oscillator 1PPS signal is shown Holdover Reference outputs are not synchronous with GPS due to the Sel Test OK mt Rar OK Owen Bur OK reported condition SmartClock maintains timing accuracy Trending by applying learned oscillator characteristics Z HEALTH MONITOR GPS 1PPS invalid M Not tracking any satellites or position is inaccurate HEALTH MONTOR PRS ne te status of cd receiver Ibps AT exceeds Held threshold components and internal signals en Err is reported Phase difference between 1PPS signals exceeds a specified Self Test limit HOLD THR
136. ldover is lit it indicates that the indicator is lit it indicates proper input power is that the Receiver is not supplied to the Receiver phase locking its internal reference to the reference provided by GPS Typically 2 When the GPS Lock this would happen due to indicator is lit it indicates loss of satellite tracking The that the Receiver is internal reference oscillator tracking satellites and has will determine the accuracy phase locked its internal of the 1 PPS signal and the reference to the reference 10 MHz reference output provided by GPS when the Receiver is operating in holdover See specification for Accuracy in Holdover in Chapter 4 58503A Specifications in the Getting Started guide 4 When the Alarm indicator is lit it indicates that the Receiver has detected a condition that requires attention Front and Rear Panels at a Glance 1 4 Front and Rear Panels at a Glance 58503A Rear Panel at a Glance 1 2 3 OUTPUTS 1PPS Alarm TTL PORT 1 888088000008 00808808086 J 5 POWER POWER 24vDC O 48 VDC O 120 240 VAC 50 60 Hz 50 VA MAX 1 1 PPS connector for outputting a 4 N type female ANTENNA continuous 1 Pulse Per Second connector signal 2 Alarm output for external devices 5 PORT 1 RS 232C serial interface such as red light bell or horn to port for remote control indicate that the Receiver has monito
137. leap second is pending A value of 1 indicates a leap second is pending The leap second adjustment can be either the addition of a second or the subtraction of a second Context Dependencies This query is not valid prior to the first lock following powerup see bit 2 of the Powerup Status Register or SYSTem PRESet but is valid if no leap second is pending Sending this query before the first lock will generate error 230 Programmable Pulse Output 59551A Only The Programmable Pulse output feature provides a means of using the GPS Receiver as a pulse generator The pulse output which is programmable by the user can either generate a stream of pulses at a specified start time and repetition interval or it can produce a single pulse at a specified time and then stop The following commands are provided to allow you to operate and control the programmable output of the 59551A GPS Receiver Note that the configuring of the Programmable Pulse output requires consideration of five settings start date start time continuous on off pulse period and pulse polarity Changing any one of the settings will stop any previously configured pulse stream and reassert all five settings If the start date has already passed when you modify the repetition interval the pulse output will halt until you provide a new start date PULSe CONTinuous PERiod PULSe CONTinuous PERiod PULSe CONTinuous STATe PULSe CONTinuous STATe PUL
138. lears the data in Time Tag 2 input buffer TSTamp 3 clears the data in Time Tag 3 input buffer Context Dependencies SYSTem PRESet clears the time stamp measurement buffers 59551A SENSe DATA RESPONSE FORMAT Outputs data from the one specified time stamp measurement eae re buffer FORMAT INTeger BINARY Data This query outputs data from the one specified time stamp measurement buffer or Time Tag input This query does not clear the buffer Each time stamp provides the year month day hours minutes seconds milliseconds microseconds nanoseconds and TFOM Time Figure of Merit Expanded Syntax SENSe DATA TSTamp 1 or TSTamp 2 or TSTamp 3 Response If the format is ASCii the default format the response is a sequence of comma separated integers Command Reference 5 72 Command Reference If the format is INTeger the response is BINARY Data see Table B 3 in Appendix B SCPI Syntax and Style in this guide for details To determine which format is selected use query FORmat DATA Parameter Use TSTamp 1 or TSTamp 2 or TSTamp 3 to select one input at a time TSTamp 1 outputs the data from Time Tag 1 input buffer TSTamp 2 outputs the data from Time Tag 2 input buffer TSTamp 3 outputs the data from Time Tag 3 input buffer Context Dependencies SYSTem PRESet clears the time stamp measurement buffers and overflow counts Time stamps are not collected until afte
139. lid even if power is lost Access to the diagnostic log entries is through commands in the DIAGnostic LOG subtree For example to read the first diagnostic log entry use the command DIAG LOG READ 1 The possible log messages that can be displayed on your computer display are listed in the following table Diagnostic Log Messages Log cleared Always becomes first log message when the log is cleared See DIAG LOG CLEAR yyyymmdd hh mm ss present time from GPS SYNC HOLD INIT Holdover started TI error Indicates transition to holdover due to problem detected with Receiver ability to properly measure interval between GPS 1 PPS and internal oscillator 1 PPS Holdover started TI limit exceeded Indicates transition to holdover due to the interval from GPS 1 PPS to internal oscillator 1 PPS exceeding a limit threshold for numerous measurements Holdover started not tracking GPS Indicates transition to holdover since GPS is not tracking sufficient E a te oon eee eee ee detected GPS 1PPS timing inaccuracy failure Command Reference 5 32 Command Reference Holdover started invalid GPS 1PPS Indicates transition to holdover due to problem with the GPS 1PPS signal Holdover started GPS Indicates transition to holdover due to some other GPS problem Holdover started HW error Indicates transition to holdover due to internal hardware error Holdover started temporary Indicates temporary transition to holdover due to changing o
140. lite loss 4 27 5 46 5 47 5 48 satellite management 4 23 4 25 5 7 5 9 5 10 5 12 5 13 5 15 5 17 5 19 5 21 5 23 5 25 5 27 5 28 5 29 5 30 5 32 5 33 5 35 5 37 5 46 5 47 5 48 5 49 5 50 5 52 5 53 satellite reacquisition 4 27 satellite selection 4 25 5 7 satellite tracking at installation 4 23 5 7 5 9 satellites selection 5 23 SatStat 3 8 3 9 3 10 Command Index SCPI 5 3 description 5 4 version 4 22 SCPI Command and Query Format 5 4 SCPI conformance Information 4 22 SCPI standard 5 18 self test 3 7 4 30 5 54 5 89 5 90 5 91 selftest 5 89 self test diagnostics 3 7 semantic error 5 5 separator keyword 5 7 parameter 5 8 serial interface cable diagram 2 8 serial interface communication 4 38 serial interface port preset 5 131 serial interface port PORT 1 1 3 PORT 2 1 2 serial Interface port 2 3 2 4 serial interface ports 2 3 serial number 5 136 serial port error recovery 4 29 4 38 5 53 5 130 serial port I O 4 38 5 132 serial port settings 2 11 SERIAL 1 5 123 SERIAL2 5 123 setting up the Receiver 3 4 settings serial port 2 11 setup 4 42 5 9 5 23 signal loss 4 27 5 38 5 46 5 47 5 48 5 49 5 50 5 52 Software pacing 2 9 status alarm 5 68 5 75 command error 5 72 5 85 hardware 5 70 5 79 5 80 5 81 5 82 5 83 5 84 holdover 5 71 5 79 5 80 5 81 5 82 5 83 5 84 operation 5 69 5 79 5 80 5 81 5 82 5 83
141. llustrated foldout of the Receiver Status screen which is a comprehensive summary of key operation conditions and settings is provided at the end of this chapter Chapter 4 Command Quick Reference is a quick reference that summarizes the Receiver commands The commands are presented or grouped by their functions A foldout sheet that presents all of the commands on one side Receiver Commands at a Glance and illustrates the status reporting system on the other side Status Reporting System at a Glance is provided at the end of this chapter Chapter 5 Command Reference provides a description of each command that can be used to operate the GPS Receiver The commands are grouped by functions The functions are grouped and ordered the same as they are in Chapter 4 Command Quick Reference and on the foldout Receiver Commands at a Glance A comprehensive discussion on how you can monitor and control alarm conditions using the status registers is also provided in this chapter Appendix A Error Messages lists all error messages the Receiver could generate along with descriptions of possible causes for the errors Appendix B Command Syntax and Style provides an overview of the Standard Commands for Programming Instrument SCPI syntax and style to help you program the Receiver Appendix C Receiver Firmware Installation provides a procedure for downloading new firmware to the GPS Receiver Comm
142. m PRESet clears the time stamp measurement buffers and overflow counts Time stamps are not collected until after the Receiver has completed its powerup and has reached initial GPS lock 59551A SENSe DATA MEMory SAVE SYSTem PRESet Sets the Receiver s memory management protocol FIRSt ION VOLATILE This command sets the Receiver s memory management protocol Expanded Syntax SENSe DATA MEMory SAVE FIRSt or LAST Parameter FIRSt retains time stamps for the first 256 events detected LAST retains time stamps of the last most recent 256 events detected Context Dependencies SYSTem PRESet sets memory management protocol to retain time stamps for FIRSt 256 events Command Reference 5 77 Command Reference 59551A SENSe DATA MEMory SAVE RESPONSE FORMAT Returns the state of the memory management protocol XYZ This query returns the state of the memory management protocol Response FIRS indicates that the memory retains time stamps for the first 256 events detected LAST indicates that the memory retains time stamps for the last most recent 256 events detected Command Reference 5 78 Command Reference Serial Interface Communication The 59551A and 58503A GPS Receivers provide a set of commands that allow you to configure the serial interface port s for instrument communications A set of special commands is provided for the 59551A Receiver since it has two different serial ports PORT 1 PORT
143. mands and the status system mask commands For these commands an out of bounds value is ignored and error 222 is generated Also a single out of bounds value may cause the entire command to be ignored For example GPS SAT TRAC INCL 3 87 5 will be entirely ignored because 87 is out of range i e 3 and 5 do not become included even though they are in range Commands with multiple numeric parameters can produce multiple errors For example if the initial date command is sent as GPS INIT TIME 25 66 7 the actual programmed value will be 23 59 00 23 is max hour 59 is max minute 0 is min second and three out of range errors will be generated As always only a single prompt will be returned but in this case three errors will be in the error queue de queued via SYST ERR or CLS For Queries response generating commands If the query produces an error there will not be a response other than the prompt that always occurs If the query includes a numeric parameter and that parameter is Error Messages A 6 Error Messages out of range error 222 will be generated and there won t be a response this is consistent with the prior bullet An example of this would be DIAG LOG READ 25 when there are fewer than 25 messages in the log Note that for this specific example to get the most recent log entry simply use DIAG LOG READ Another way you can view this if you get a query response you can know that it is
144. me Now let s send the SYSTEM STATUS query again to see what kind of progress the Receiver has made You can now see that the Receiver is tracking several satellites as shown in Figure 3 4 The process of acquiring and tracking satellites is described in the following paragraphs Visual User Interface 3 11 Visual User Interface Receiver Status SYNCHRONIZATION Outputs Valid Reduced Accuracy SmartClock Mode Reference Outputs Locked to GPS TFOM 3 FFOM 2 Recovery 1PPS TI gt gt Holdover GPS 1PPS invalid HOLD THR 1 000 us Power up Holdover Uncertainty Predict 432 0 us initial 24 hrs Holdover Duration Present 1 0 us ACQUIS GPS 1PPS Invalid Tracking 0 _ Tracking 7 El Az PRN 71 316 31 UTC 20 56 14 31 Jan 1996 41 186 GPS 1PPS Inaccurate not tracking 11 86 ANT DLY 0 ns 35 107 Position 68 78 DE Survey 71 1 complete 26 23 314 N 37 19 32 472 W 121 59 51 784 ELEV MASK 10 deg attempting to track 42 19 m GPS HEALTH MONI OK Self Test OK Int Pwr OK OCXO OK EFC OK GPS Rcv OK Figure 3 4 Receiver Status Screen Displaying Initial Satellite Acquisition An asterisk next to the PRN of a satellite in the Not Tracking column indicates the Receiver is attempting to track it The elevation El and azimuth Az angles of the satellite are indicated Acq or Acq tell you that the Receiver is attempting to t
145. me Identifying Time of Next 1 PPS Reference Edge Reading Current Time Applying Local Time Zone Offset Defining the 1 PPS Reference Edge 59551A Only Reading Leap Second Status Programmable Pulse Output 59551A Only Event Time Stamping 59551A Only Defining the Time stamped Edge Clearing Time Stamp Memory Reading Time Stamps Processing Memory Overflow ADO oOw 4k A A A SN NNNNA WO VO V DO o o0 o0 10 10 10 10 10 11 12 12 12 12 12 Contents Serial Interface Communication Configuring I O Port 1 Configuring I O Port 2 59551A Only Recovering the Last Query Response Receiver Initialization Receiver Identification Upgrade Reading Product Identification Installing Firmware via I O Port 1 Receiver Commands at a Glance Chapter 5 Command Reference Command Syntax Conventions Description Format Commands and Returns Query Specific Information Description of Response Formats ASCII encoded GPS Satellite Acquisition 1 PPS Reference Synchronization Operating Status System Time Programmable Pulse Output 59551A Only Event Time Stamping 59551A Only Defining the Time stamped Edge vi 13 13 13 13 14 15 15 15 16 oF A 21 29 55 64 70 70 Contents Clearing Time Stamp Memory Processing Memory Overflows Serial Interface Communication Receiver Initialization Receiver Identification Upgrade Appendix A Error Messages Introduction Readin
146. me Stamping LSe STARt TIME 59551A Defining the Time stamped Edge lt channel gt 1 or2 or3 SENSe TSTamp lt channel gt EDGE RISing or FALLing SENSe TSTamp lt channel gt EDGE Clearing Time Stamp Memory SENSe DATA CLEar SENSe DATA CLEar lt data set gt 3 Reading Time Stamps SENSe DATA lt data set gt 3 FO FO RMat DATA ASCii or INTeger RMat DATA SENSe DATA POINts SENSe DATA POINts lt data set gt 3 SENSe DATA TSTamp lt data set gt 3 lt data element number gt Processing Memory Overflows SE SE SE SE NSe DATA MEMory OVERflow COUNt NSe DATA MEMory OVERflow COUNt lt data set gt 3 NSe DATA MEMory SAVE FIRSt or LAST NSe DATA MEMory SAVE Serial Interface Communication Configuring 1 O Port 1 lt port gt SERial1 or SERial Configuring I O Port 2 lt port gt SERial2 59551A R F SYSTem COMMunicate R Ft SYSTem COMMunicate lt port gt BAUD lt rate gt 4 R F SYSTem COMMunicate lt port gt BAUD R SYSTem COMMunicate SERial1 BITS 7or 8 R F SYSTem COMMunicate lt port gt BITS R Ft SYSTem COMMunicate lt port gt FDUPIex ON or OFF R F SYSTem COMMunicate lt port gt FDUPIex R Ft SYSTem COMMunicate lt port gt PACE XON or NONE R F SYSTem COMMunicate lt port gt PACE R SYSTem COMMunicate SERial1 PARity lt parity gt 5 F SYSTem COMMunicate SERial2 PARity lt parity gt 5 or ONE R F SYSTem COMMunicate lt port gt PARity R SYSTem COMMunicate SERial1 SBITs 10r 2 R F
147. minator 5 10 terminators 5 5 command error 4 30 5 54 5 65 5 72 Command Error status 5 65 command syntax conventions 4 22 5 4 commands introduction 4 22 Commands at a Glance 4 2 commands summary 4 2 common command syntax 5 5 Common Command Format 5 4 common commands description 5 4 communication serial interface port 2 3 2 4 communication serial interface port 5 122 5 123 5 125 5 126 5 127 5 128 compensating for antenna delay 5 30 configuration PORT 1 2 11 5 122 PORT 2 2 11 5 122 configuration factory default values 5 132 configure serial interface port s 5 122 configuring I O Port 1 4 38 configuring I O Port 2 59551A 4 38 Configuring PORT 1 2 10 Configuring PORT 2 2 11 configuring the RS 232C ports 2 9 configuring the serial interface port s 5 122 conformance Information SCPI 4 22 connecting antenna 1 3 4 25 5 8 5 30 Command Index connecting a computer 2 5 connecting a laptop 2 7 connecting a Laptop 2 6 connecting a modem 2 5 2 6 connecting a PC 2 6 3 4 connecting the antenna system 3 4 Connecting to a PC 3 4 connection laptop 2 7 modem 2 6 connectors 1PPS 1 3 Alarm BITE 1 3 Alarm 58503A 1 3 ANTENNA 1 3 IRIG B 1 3 Programmable Pulse 1 3 time tag 1 3 conventions command syntax 4 22 5 4 Coordinated Universal Time 5 7 CPU 5 89 crossover cable 2 5 current time 4 32 D d dEe 5 14 d dEe 5 14 data 5 114 data bits 2 9 5 1
148. misphere respectively The following table lists the allowed settings of other parameters reams raras peoo wane tongs Pren 0 to 59 999 0 001 lt longitude seconds gt 0 to 59 999 0 001 LAST denotes the last specified position This parameter is provided to cancel surveying automatic position computation and restore the last position setting SURVey directs the Receiver to stop surveying and use the computed position This position is the average of individual position computations Context Dependencies Error 221 is generated if this command is sent as SURV and no valid survey calculation has ever been computed Command Reference 5 9 Command Reference Side Effects This command stops position surveying The computed position is retained and applied only when SURVey is specified GPS POSition RESPONSE FORMAT Returns the current average position of the GPS antenna XYZ or dd or d dEe This query returns the current average position of the Receiver Response Returns a list of values defining the Receiver position N or S lt latitude degree gt lt latitude minute gt lt latitude second gt E or W lt longitude degree gt lt longitude minute gt lt longitude second gt lt height above mean sea level meters gt Context Dependencies Error 230 is generated if in survey and first calculation has not occurred GPS POSition ACTual RESPONSE FORMAT Returns the current instantaneous pos
149. n the computed position An error in the computed position of the antenna translates into an error in the derived time and will compromise the Receiver s ability to be a timing source Let s consider a case where four satellites are not visible at powerup because of a poor antenna Visual User Interface 3 12 Visual User Interface location such as an urban canyon located between tall city buildings If accurate position is known from a Geodetic survey of that site it can be programmed with the position command thereby bypassing the survey operation This is useful when four satellites cannot be tracked for an extended period of time Let s send the SYSTEM STATUS query again to observe the current status of the Receiver The updated demonstration status screen in Figure 3 5 indicates that the position survey is now 5 4 complete Thus the survey task is beginning to iterate toward an accurate position In the Time quadrant the UTC time is now correct The date is correct and the GPS reference signal is synchronized to UTC Visual User Interface 3 13 Visual User Interface Receiver Status SYNCHRONIZATION Outputs Valid Reduced Accuracy SmartClock Mode Reference Outputs gt gt Locked to GPS Stabilizing frequency TFOM 3 FFOM 1 Recovery 1PPS TI 10 6 ns relative to GPS Holdover HOLD THR 1 000 us Power up Holdover Uncertainty Predict 432 0 us initial 24 hrs ACQUIS GPS 1PPS Valid Tracking
150. notation 123 123e2 123 1 23e2 123 1 23e 2 1 23000E 01 Special cases include MINimum and MAXimum as follows MINimum selects minimum value available MAXimum selects maximum value available Queries using MINimum or MAXimum return the associated numeric value lt Boolean gt Represents a single binary condition that is either true or false 1 or ON 0 or OFF Query response returns only 1 or 0 An lt NRf gt is rounded to an integer A non zero value is interpreted as 1 lt literal gt Selects from a finite number of choices These parameters use mnemonics to represent each valid setting An example of a lt literal gt parameter is GPS lt NRf gt Flexible numeric representation Only positive integers are used for NRf parameters in the instrument lt string gt A string parameter is delimited by either single quotes or double quotes Within the quotes any characters in the ASCII B bit code may be specified lt non decimal Format for specifying hexadecimal H1F octal Q1077 and binary B10101011 numbers numeric gt using ASCII characters May be used in STATus subsystem commands Parameter Separator If you send more than one parameter with a single command you must separate adjacent parameters with a comma Query Parameters All selectable lt numeric value gt parameters can be queried to return the minimum or maximum values they are capable of being set to by sending a MINimum or MAXimum parameter af
151. ns a position at the tail of the queue for a new error if one is subsequently detected When all errors have been read from the queue further error queries return 0 No error The error queue is cleared when any of the following occur Upon power on Upon receipt of a CLS command Upon reading the last item from the queue Error Messages A 3 Error Messages Error Types Error numbers are categorized by type as shown in Table A 1 Each error is listed in Table A 2 Table A 1 Error Types wooo y yom S 100 to 199 ee Errors 300 to 350 Hardware Firmware Errors The first error described in each class for example 100 200 300 400 is a generic error No Error The SYST ERR response 0 No error indicates that the Receiver has no errors The error queue is empty when every error in the queue has been read SYST ERR query or the queue was cleared by power on or CLS Syntactic Error An lt error number gt in the range 100 to 199 indicates that an IEEE 488 2 syntax error has been detected by the Receiver s parser The occurrence of any error in this class causes the syntactic error bit bit 5 in the Event Status Register to be set One of the following events has occurred e An IEEE 488 2 syntax error has been detected by the parser That is a controller to Receiver message was received that is in violation of the IEEE 488 2 Standard Possible violations include a data el
152. nse Definition Description of Response Formats ASCII encoded The following legend provides the meaning of each type of response format Refer to Table B 3 in Appendix B Command Syntax and Style for details Oori Single character one or zero dd 10 Integer d d 1 5 Fixed point number td dEe 1 00000E 009 Floating point number XYZ LOCK Alphanumeric characters XYZ 19 49 51 or No error Quoted string dd 14 15 18 22 29 Comma separated list of integers TOA E Log 001 19950101 00 00 00 Power on Comma separated list of Log 002 19950101 00 10 00 Log cleared quoted strings Command Reference 5 5 Command Reference GPS Satellite Acquisition The GPS Receiver is designed to acquire time transfer information time date and position from the GPS satellites which is used by the Receiver s internal reference oscillator and SmartClock technology to lock to GPS It acquires a precise time and date by tracking at least one satellite By tracking at least four satellites it precisely determines the position of the antenna With this information the Receiver can produce a precise 1 PPS signal that is exactly synchronous to Coordinated Universal Time UTC as determined by GPS The following commands are provided to facilitate initiate GPS satellite tracking to establish accurate GPS antenna position to select or ignore satellites to compensate for antenna cable delay
153. o satellites predicted visible Theory Satellites must be in view to be tracked At least four satellites must be in view and tracked to determine the position in position survey operation Only one satellite must be in view and tracked to maintain operation of the reference oscillator locked to GPS when in position hold operation GPS SATellite TRACking COUNt RESPONSE FORMAT Returns the number of satellites being tracked dd This query returns the number of satellites being tracked Response If there are no satellites being tracked this query returns a 0 GPS SATellite VISible PREDicted COUNt RESPONSE FORMAT Returns the number of satellites that the almanac predicts dd should be visible given date time and location This query returns the number of satellites that the almanac predicts should be visible given date time and location if any of these are incorrect the prediction will be incorrect Response Number of satellites predicted visible Theory Satellites must be in view to be tracked At least four satellites must be in view and tracked to determine the position in position survey operation Only one satellite must be in view and tracked to maintain operation of the reference oscillator locked to GPS when in position hold operation Command Reference 5 20 Command Reference 1 PPS Reference Synchronization 1 PPS and 10 MHz 58503A only output signals are generated by the Receiver s int
154. ommand Theory A condition change from SET to CLEAR or CLEAR to SET of the User reported bit of the Questionable Condition Register and the appropriate configuration of the Questionable Transition Filter is necessary to generate an event in the Questionable Event Register Furthermore when the User reported bit of Questionable Event Enable Register is enabled and the Questionable Summary bit of the Alarm Enable Register is enabled then a transition of the User reported condition will generate an ALARM STATus QUEStionable EVENt USER Generates a transition of the User reported bit of the EVENT Questionable Condition Register ION VOLATILE This command generates a transition of the User reported bit of the Questionable Condition Register Expanded Syntax STATus QUEStionable EVENt USER PTRansition or NTRansition Parameter PTRansition will cause the User reported bit of Questionable Condition Register to transition from a setting of 0 to a setting of 1 NTRansition will cause the User reported bit of Questionable Condition Register to transition from a setting of 1 to a setting of 0 Context Dependencies Issuing PTRansition while the User reported bit of the Questionable Positive Transition Register is enabled sets the User reported bit of the Questionable Event register Command Reference 5 52 Command Reference Issuing NTRansition while the User reported bit of the Questionable Negative Transition Re
155. ommand Error Event Register are enabled to report to the Command Error Summary bit of the Alarm Condition Register Response The range is 0 to 255 The response value represents the sum of the binary weighted values of the register The value of unused bits is zero Theory Reading Querying the Command Error Enable Register does not change its contents ESR RESPONSE FORMAT Reads the Command Error Event Register dd This query reads the Command Error Event Register retrieving information about errors or power cycles that have occurred since the instrument was last queried or cleared by SYSTem PRESet or CLS Response The range is 0 to 255 The response value represents the sum of the binary weighted values of the register The value of unused bits is zero O Reporting Questionable Status STATus QUEStionable CONDition USER SYSTem PRESet Sets the User reported bit of the Questionable Condition Clear Register ON VOLATILE This command sets the User reported bit of the Questionable Condition Register Command Reference 5 51 Command Reference Expanded Syntax STATus QUEStionable CONDition USER SET or CLEar Parameter SET will cause the User reported bit of Questionable Condition Register to be set to 1 CLEar will cause the User reported bit of Questionable Condition Register to be set to 0 Side Effects The User reported bit of the Questionable Condition Register is set or cleared by this c
156. on 5 38 5 39 multipliers 5 9 N new line 5 17 NONE 5 126 NRf 5 8 null modem cable 2 5 O OHM 5 9 one pulse per second 1 3 operating in Holdover 5 38 5 49 operating status 5 53 operation status 5 69 5 79 5 80 5 81 5 82 5 83 5 84 Operation status 5 65 output 10MHz 4 27 4 32 5 38 5 39 5 40 5 41 5 42 5 43 5 44 5 45 5 46 5 47 5 48 1PPS 5 38 5 39 5 40 1PPS 4 27 4 32 5 38 5 39 5 40 5 41 5 42 5 43 5 44 5 45 5 46 5 47 5 48 5 98 alarm 4 27 programmable pulse 5 103 5 104 5 105 5 106 5 107 5 108 Programmable Pulse 4 34 synchronization 5 39 5 40 5 41 5 42 5 43 5 44 5 45 5 46 5 47 5 48 output pulse 4 34 5 103 5 104 5 105 5 106 5 107 5 108 output synchronization 4 27 outputs 1PPS 1 3 Alarm BITE 1 3 Command Index Alarm 58503A 1 3 IRIG B 1 3 Programmable Pulse 1 3 overview SatStat 3 3 Receiver Status Screen 3 3 P pace 2 9 5 126 5 127 5 132 pacing 5 132 parameter separator 5 8 parameter types 5 8 literal 5 8 string 5 8 Parameter types Boolean 5 8 parameters baud rate 2 9 parity 2 9 Software pacing 2 9 stop bits 2 9 parity 2 9 5 127 5 128 5 132 PCT 5 9 pin assignment PORT 1 2 4 PORT 2 2 4 polarity of 1PPS output 4 32 5 98 polarity of edges 1PPS 4 32 5 98 programmable pulse 4 34 time stamp 4 36 5 110 5 111 polarity of the edges time stamp 5 111 polarity programmable pulse 4 34 pola
157. ons and be forced to modify your PC settings to match the Receiver in order to continue It is recommended that you make all changes in a single compound command verify the changes and record all parameters Configuring PORT 1 Complete configuration of PORT 1 requires that you set five parameters The command line sent in the following example would set the RS 232C port pacing to XON baud rate to 2400 parity to EVEN data bits to 7 and stop bits to 2 This command line must be transmitted on PORT 1 SYST COMM SER PACE XON BAUD 2400 PARITY EVEN BITS 7 SBITS 2 Serial Interface Capabilities 2 10 Serial Interface Capabilities Configuring PORT 2 59551A Only Complete configuration of PORT 2 requires that you set three parameters The command line sent in the following example would set the RS 232C port pacing to XON baud rate to 2400 and parity to EVEN This command line must be transmitted on PORT 2 SYST COMM SER2 PACE XON BAUD 2400 PARITY EVEN If Changes Have Already Been Made to the Serial Port Settings If you connect your PC press Return and do not get a Scpi gt prompt back from the Receiver your Receiver s serial communication settings may have been modified You need to systematically step through the data communication settings on your PC until your PC matches the Receiver The Receiver cannot communicate its settings until this process is complete Iterate until you are able to verify that settings on your
158. outputs 4 25 4 32 5 8 5 33 5 92 5 93 5 94 5 95 5 96 time stamp polarity of the edges 5 111 Time Stamp memory 4 36 time stamp polarity 4 36 5 110 5 111 time stamping 1 3 4 36 5 110 5 111 5 113 5 114 5 115 5 116 5 117 5 118 5 119 5 120 5 121 time stamps 5 110 Time Stamps 4 36 time tag 1 3 4 36 5 110 5 111 5 113 5 114 5 115 5 116 5 117 5 118 5 119 5 120 5 121 Time tag inputs 1 3 Command Index 12 time tagging input 4 36 time transfer information 5 7 time zone setting 4 32 5 92 5 97 time stamped edge 5 111 time stamped edge 5 111 Time stamped Edge 4 36 timing outputs 4 27 5 39 5 40 5 41 5 42 5 44 5 46 5 47 5 48 TSTamp n 5 113 5 114 5 117 tutorial using the Status Screen 3 10 U UART 5 89 units 5 9 upgrading firmware 2 3 5 135 Upgrading firmware 4 42 using the Receiver Status Screen 3 1 UTC 5 7 UTC timeline 5 92 vV V 5 9 visible satellites 5 35 WwW Windows program Receiver Status screen 5 3 Receiver Status Screen 3 8 X XON 5 126 XYZ 5 16 PORT 1 5 122 5 123 5 124 5 125 5 126 5 127 5 128 5 129 PORT 2 5 122 5 123 5 124 5 125 5 126 5 127 5 128 5 129 CLS 5 73 5 137 ESE 5 85 ESE 5 86 ESR 5 86 IDN 5 136 SRE 5 76 SRE 5 76 STB 5 77 TST 5 89 CALCulate Subsystem CALCulate WMARgin DATA 4 25 DIAGnostic DOWNload 5 137 ERASe 5 138 ERASe 5 1
159. ow to read any errors from the Receiver discusses the error queue types of errors and general error behavior and provides a table of all of the Receiver s errors and their probable causes Reading an Error Executing the SYSTEM ERROR command reads the oldest error from the error queue and erases that error from the queue The SYST ERR response has the form lt error number gt lt error string gt An example response is 113 Undefined header scpi gt Positive error numbers are specific to the Receiver Negative error numbers are command language related and are discussed later in this appendix All errors set a corresponding bit in the Standard Event Status Register see Figure 5 1 Error Messages A 2 Error Messages Error Queue As errors are detected they are placed in an error queue This queue is first in first out That is if there has been more than one error the first one in the queue is read out with SYST ERR Subsequent responses continue until the queue is empty If the error queue overflows the last error in the queue is replaced with error 350 Queue overflow Any time the queue overflows the least recent errors remain in the queue and the most recent error is discarded The length of the Receiver s error queue is 30 29 positions for the error messages and 1 position for the Queue overflow error Reading an error from the head of the queue removes that error from the queue and ope
160. owing elements and functions are tested CPU EPROM RAM EEPROM UART QSPI FPGA logic Interpolators GPS engine Power supply levels Reference oscillator Response A value of 0 indicates the tests passed a non zero value indicates the selftest was not completed or was completed with errors detected DIAGnostic LIFetime COUNt RESPONSE FORMAT Returns the lifetime count indicating the total powered on time dd This query returns the lifetime count indicating the total powered on time Response Range of the integer is 0 to 4 294 967 296 with a resolution of 1 Each count represents three hours of operation Command Reference 5 54 Command Reference DIAGnostic TEST RESPONSE FORMAT Returns information for user specified test dd This query returns information for user specified test Expanded Syntax DIAGnostic TEST ALL or DISPlay or PROCessor or RAM or EEPRom or UART or QSPI or FPGA or INTerpolator or GPS or POWer Response A value of 0 zero indicates test passed Parameter ALL returns test information for all of the tests DIAGnostic TEST RESult RESPONSE FORMAT Returns the result of the last test and the type of test dd XYZ performed This query returns the result of the last test and the type of test performed Use this query for example following powerup to check the outcome of the powerup selftest Response A value of 0 indicates test passed Non zero value indicates test
161. query identifies whether the Receiver is in position hold or survey mode In survey mode the Receiver continually refines its position In position hold mode the position setting does not change Response A value of 0 indicates not in position hold in survey mode a value of 1 indicates in position hold GPS POSition SURVey PROGress RESPONSE FORMAT Returns percent completed while in survey mode d d This query returns percent completed while in survey mode Automatic transition to position hold mode occurs following completion of survey mode indictated by 100 Response The range is 0 to 100 The units are percent Context Dependencies This query is only valid while surveying for position GPS POS SURV STATe returns ONCE or status bit 3 0 in the Operation Status Register If queried while not surveying error 221 is generated GPS POSition SURVey STATe SYSTem PRESet Initiates survey mode during which the Receiver determines its ONCE position from satellite data This command initiates survey mode during which the Receiver determines its position from satellite data The Receiver refines successive positional estimates to obtain a final position transitions from survey to position hold mode Expanded Syntax GPS POSition SURVey STATe ONCE Command Reference 5 11 Command Reference GPS POSition SURVey STATe RESPONSE FORMAT Identifies whether the Receiver is in survey or position hold XYZ or0 mode This
162. r the Receiver has completed its powerup and has reached initial lock to GPS Time stamps are not collected while the user is reading clearing or otherwise accessing the time stamp buffers 59551A FORMat DATA SYSTem PRESet Selects output format for the time stamps ASCii ON VOLATILE This command selects the output format for the time stamps Expanded Syntax FORMat DATA ASCii or INTeger Parameter If the format is ASCii the default format the response is a sequence of comma separated integers If the format is INTeger the response to the SENSe DATA query is BINARY Data see Table B 3 in Appendix B Command Syntax and Style in this guide for details When ASCii formatting is selected the output stream data is buffered In general INT mode will provide faster output than ASC but will require special data handling routines to interpret the BINARY Data Command Reference 5 73 Command Reference 59551A FORMat DATA RESPONSE FORMAT Returns the output format for time stamp data XYZ This query returns the output format for time stamp data Response ASC or INT is returned 59551A SENSe DATA POINts RESPONSE FORMAT Returns the number of time stamps in each of the three Time dd Tag inputs This query returns the number of time stamps in each of the three Time Tag inputs Response Returns three comma separated integers corresponding to the number of time stamps recorded for input
163. rack that satellite One dot after the Acq indicator shows that the Receiver is attempting to acquire its signal and two dots indicate impending lock Eventually you will see the satellite move from the Not Tracking column which shows the satellite PRN the elevation angle of the satellite in the sky 90 being zenith the azimuth angle number of degrees bearing from true north and the signal strength SS A good signal strength is a number above 20 which would be efficient for the Receiver to operate Numbers below 20 suggest intermittent tracking of the satellite or no tracking check your antenna system should this be the case As indicated by the demonstration screen in Figure 3 4 the Receiver is now surveying for position It is tracking four satellites which is the minimum number that must be tracked to determine postion As you can see the Position MODE line indicates survey is 1 2 complete A complete survey would take two hours during which four satellites or more are continuously tracked Also you can see the initial estimated position has been replaced with a computed position which the Receiver continuous to refine until it gets a very accurate position The status screen indicates that a computed position is being used by displaying the averaged latitude and longitude height AVG LAT AVG LON and AVG HGT If the position were not precise GPS timing information would be inaccurate by an amount corresponding to the error i
164. rd separator 5 7 ie laptop connection 2 7 LAST 5 121 latitude 4 23 5 7 5 13 5 15 5 17 5 18 leap second 4 32 leap second status 5 92 LED Alarm 1 2 GPS Lock 1 2 Holdover 1 2 Power 1 2 LED Alarm 4 29 5 53 LED GPS Lock 4 27 LED Holdover 4 27 LEDs 4 27 lifetime count 5 90 lifetime count 4 30 list of commands 4 2 configuration factory default values 5 132 error types 5 4 factory default values 5 132 response format 5 13 system preset 5 133 literal 5 8 local time 4 32 locking to GPS satellites 4 23 4 25 5 7 5 8 5 9 5 10 5 12 5 13 5 15 5 17 5 19 5 21 5 23 5 25 5 27 5 28 5 29 5 30 5 32 5 33 5 35 5 37 5 46 5 47 5 48 5 49 5 50 5 52 5 53 log diagnostic 4 29 5 53 5 59 5 60 5 61 5 63 5 64 log error 4 29 5 53 5 54 5 57 5 139 longitude 4 23 5 7 5 13 5 15 5 17 5 18 M MAXimum 5 8 maximum value 5 8 memory overflow 4 36 5 110 messages program 5 10 response 5 11 MINimum 5 8 minimum value 5 8 modem eliminator cable 2 5 monitoring 1 PPS synchronization 5 38 5 39 multipliers 5 9 N new line 5 17 NONE 5 126 NRf 5 8 null modem cable 2 5 O OHM 5 9 one pulse per second 1 3 operating in Holdover 5 38 5 49 General Index 9 General Index operating status 5 53 operation status 5 69 5 79 5 80 5 81 5 82 5 83 5 84 Operation status 5 65 output 10MHz 4 27 4 32
165. rease towards the ultimate values that represent steady state performance Refer to the subsection titled Reference Outputs in Chapter 2 Features and Functions of the Getting Started guide for more information about TFOM and FFOM Also indicated is a prediction of the accuracy of the Receiver should it go into holdover operation Visual User Interface 3 14 Visual User Interface Demonstration of Holdover Operation CAUTION The Receiver typically reaches stable state 24 hours after powerup and it will learn best if its experiences no holdover in the first 24 hours Therefore the holdover demonstration in the following paragraphs will compromise the Receiver s ability to learn the characteristics of its internal reference oscillator For the purpose of education only you will be shown how to initiate a holdover A user should never initiate holdover during the first 24 hours while the Receiver is learning its internal oscillator characteristics The Receiver should maintain GPS lock during this time because it is using the GPS signal to discipline the oscillator It will learn what the oscillator drift characteristics are relative to the GPS signal It will learn how the oscillator ages and the software will learn how to compensate for that aging Thus it is recommended that the Receiver is always kept locked to GPS during the first 24 hours For demonstration purposes and since the Receiver has been powered up for a wh
166. red but was not recorded because the error queue is full Communication error This is the generic communication error for devices that cannot detect the more specific errors described for errors 361 through 363 Parity error in program Parity bit not correct when data received for example on a serial port 311 Memory error Occurs on EEPROM write failure Configuration memory lost Could happen on powerup or preset if a nonvolatile memory problem is detected Indicates that a system error occurred Out of memory Indicates that the Receiver has detected that insufficient memory is available message Framing error in program A stop bit was not detected when data was received For example on a serial port for example a message baud rate mismatch Input buffer overrun Software or hardware input buffer on serial port overflows with data caused by improper or nonexistent pacing Query UNTERMINATED Indicates that a query was received in the same program message after a query requesting an after indefinite response indefinite response e g IDN or PTIM TCOD or SYST STAT Error Messages A 9 Error Messages Error Messages A 10 Command Syntax and Style Command Syntax and Style Appendix Contents Appendix Contents This appendix provides an overview of the Standard Commands for Programming Instrument SCPI syntax and style to help you program the Receiver A section that lists SCPI reference documentation is al
167. register gt OPERation POWerup STATus lt register gt CONDition Returns the Condition Status Register value STATus lt register gt EVENt Returns the Event Status Register value STATus lt register gt ENABle lt bit mask gt STATus lt register gt ENABle STATus lt register gt NTRansition lt bit mask gt STATus lt register gt NTRansition STATus lt register gt PTRansition lt bit mask gt STATus lt register gt PTRansition Reading and Qualifying Command Error Status ESE lt bit mask gt ESE ESR Reporting Questionable Status STATus QUEStionable CONDition USER SET or CLEar STATus QUEStionable EVENt USER PTR or NTR Assessing Receiver Health TST Executes an internal selftest and reports the results DIAGnostic LIFetime COUNt DIAGnostic TEST ALL or DISPlay or PROCessor or RAM or EEPROM or UART or QSPI or FPGA or INTerpolator or IREFerence or GPS or POWer DIAGnostic TEST RESult Command Quick Reference 4 9 Command Quick Reference System Time System Time The following commands are provided to allow you to monitor and control the system date and time These commands allow you access to a very accurate system clock that provides both date and time to customize the clock for a local time zone to identify the exact time to identify the accumulated time difference in seconds between the GPS and UTC timelines and to monitor leap second occurrences Identi
168. responding precisely to the question asked by the query Error Messages A 7 Error Messages List of Errors Table A 2 lists and describes the error messages Cause Error String 0 The error queue is empty Every error in the queue has been read SYSTem ERRor query or the queue was cleared by power on or CLS data was expected but block data was received 120 Numeric data error This error as well as errors 121 through 129 is generated when parsing a data element which appears to be numeric This particular error message is used when the Receiver cannot detect a more specific error Invalid character in number An invalid character for the data type being parsed was encountered For example a 9 in ocatal data Too many digits The mantissa of a decimal numeric data element contained more than 255 digits excluding leading zeros Numeric data not allowed A legal numeric data element was received but the Receiver does not accept one in this position for the header Invalid suffix The suffix does not follow the syntax described in IEEE 488 2 or the suffix is inappropriate for the Receiver String data error This error can be generated when parsing a string data element This particular error message is used if the Receiver cannot detect a more specific error Invalid string data A string data element was expected but was invalid for some reason Error Messages A 8 Error Messages mbar eworsving fa OES 158 Str
169. ring and downloading of detected an internal condition the Receiver s memory data and that requires attention This upgrading Receiver software output goes on and off with the Alarm indicator 3 10 MHz OUT output for 6 Power input jack user specific applications Front and Rear Panels at a Glance 1 5 Front and Rear Panels at a Glance Front and Rear Panels at a Glance 1 6 Serial Interface Capabilities Serial Interface Capabilities Chapter Contents This chapter describes how to operate the 59551A GPS Measurements Synchronization Module and the 58503A GPS Time and Frequency Reference Receiver via the RS 232C serial interface port Hardware connections and configuration are discussed This chapter is organized as follows e About the RS 232C Serial Port s page 2 2 PORT 1 Rear Panel RS 232C Serial Interface Port page 2 3 PORT 2 Front Panel RS 232C Serial Interface Port 59551A Only page 2 4 e Connecting a Computer or Modem page 2 5 To Connect the 59551A to a PC or Modem Via the Rear Panel DB 25 Serial Port page 2 6 To Connect the 59551A to a Laptop Computer Via the Front Panel DB 9 Serial Port page 2 7 e Configuring the RS 232C Port s page 2 9 If You Need To Make Changes to the Serial Port Settings page 2 10 If Changes Have Already Been Made to the Serial Port Settings page 2 11 Serial Interface Capabilities 2 2 NOTE Serial Interface Capabilities About the RS 232C Serial Port s
170. rity time stamp 4 36 POR 1 1 3 PORT 1 2 6 4 38 5 132 factory default values 2 9 PORT 1 configuration 2 11 PORT rear panel 2 3 PORT 2 1 2 4 38 5 132 factory default values 2 9 PORT 2 configuration 2 11 PORT 2 front panel 2 4 position 4 23 5 7 5 13 5 15 5 17 5 18 5 19 5 20 position at powerup 5 21 5 22 position hold 5 19 power ac 1 3 de 1 3 Power indicator 1 2 Power input 1 3 power outages 5 110 Power supply levels 5 89 power surges 5 110 powering up the Receiver 3 7 powerup status 5 71 Powerup status 5 65 predicted visible satellites 5 35 preface 0 3 1x preset 4 40 5 131 preset to factory defaults 2 9 4 40 5 131 5 132 product identification 4 42 5 136 program SatSat 3 8 program messages definition 5 10 syntax 5 10 programmable pulse 4 34 5 103 5 104 5 105 5 106 5 107 5 108 Programmable Pulse connector 1 3 Programmable Pulse output 1 3 pulse generator 4 34 5 103 5 104 5 105 5 106 5 107 5 108 pulse output 4 34 5 103 5 104 5 105 5 106 5 107 5 108 pulse per second 1 3 pulse polarity 4 34 Q QSPI 5 89 query 5 8 5 11 query error 5 6 query parameters lt numeric value gt 5 8 MAXimum 5 8 Command Index 9 Command Index MINimum 5 8 querying instrument identification 5 135 questionable status 5 71 Questionable status 5 65 queue overflows 5 3 queue error 4 29 5 53 5 139 quick reference command list 4 2 factory inst
171. rmware installation 2 3 4 42 5 135 5 137 5 139 5 140 5 141 firmware revision code 2 3 4 42 5 136 firmware upgrade 2 3 5 137 FIRS 5 121 flash EEPROM 5 138 flow control state 5 126 5 127 format ASCii 5 115 INTeger 5 115 FPGA logic 5 89 front panel PORT 2 2 4 full duplex 2 9 5 132 G GPS engine 5 89 GPS lock 4 23 4 25 5 7 5 46 5 47 5 48 GPS Lock indicator 1 2 4 27 5 40 GPS position 4 23 5 7 5 13 5 15 5 17 5 19 GPS satellite acquisition 4 23 4 25 5 7 5 46 5 47 5 48 GPS timeline 5 92 GUI 3 3 3 8 3 9 3 10 H hardware status 5 70 5 79 5 80 5 81 5 82 5 83 5 84 Hardware status 5 65 5 70 hardware firmware error 5 5 holdover status 5 65 holdover tutorial 3 15 Holdover indicator 1 2 4 27 5 40 holdover loss of satellites 4 27 holdover operation 3 15 holdover process 5 38 holdover recovery 4 27 5 38 5 50 holdover status 4 30 5 71 How to use the Status Screen 3 10 24542G cable 2 8 24542G interface cable 2 6 24542U cable 2 8 40242M interface cable 2 6 58503A indicators Alarm 1 2 GPS Lock 1 2 Holdover 1 2 Power 1 2 58503A inputs Power 1 3 General Index 7 General Index 58503A interface port PORT 1 1 3 58503A outputs 10 MHz OUT 1 3 1PPS 1 3 Alarm 1 3 58506A 507A S508A cable 5 31 59551A indicators Alarm 1 2 GPS Lock 1 2 Holdover 1 2 Power 1 2 59551A inputs Power 1
172. rogrammable Instrumentation This standard defines the underlying message formats and data types used in SCPI It is intended more for firmware engineers than for instrument users programmers However it can be useful if you need to know the precise definition of specific message formats data type or common commands To obtain a copy of this standard write to Receiver Firmware Installation C 2 Downloading New Firmware Using SatsStat Program 1 Copy the file of the updated firmware disk to a directory on your PC disk drive If you haven t already installed SatStat you should install it now follow instructions on the disk label or in the section titled To Install the Automated SatStat Program for Continual Status Updates in Chapter 3 Visual User Interface of this guide Start SatStat easiest way is to double click on the icon You should establish communication with the GPS Receiver This requires connection from a serial RS 232 port on your PC to the GPS Receiver s serial port a 25 pin RS 232 connection Assuming you ve got the cable attached to make this connection you may want to check the settings Select CommPort then choose Settings The Communication Settings dialog box is displayed Unless someone has reprogrammed the CommPort settings on the GPS Receiver these settings are probably OK The one setting that is likely to need changing is the Com Port The application defaults it to Com1 bu
173. rtunity to correctly correlate this time with a corresponding 1 PPS edge Response The query response provides the following type of information date and time of next on time edge Time Figure of Merit Frequency Figure of Merit leap second indicator alarm indication and service request An example response is T21995051 12055233000049 The following text describes this response The previous response example is in the T2YYYYMMDDHHMMSSMFLRVcc format where T2 indicates a timecode message YYYYMMDD is the calendar date at the next 1 PPS on time edge HHMMSS is the 24 hour time at the next 1 PPS on time edge Note that this value is influenced by the ptim tzon setting is time figure of merit F is frequency figure of merit Command Reference 5 57 Command Reference L is leapsecond indicator means a 1 leapsecond is pending 0 means no leapsecond pending means a 1 leapsecond is pending R is the request for service bit from the status system 0 no service requested 1 service requested An alarm will be generated when this byte transitions to 1 V is validity byte 1 indicates that time related information isn t valid 0 indicates that it is valid ce is the checksum of the prior bytes two Hex bytes Reading Current Time PTIMe DATE RESPONSE FORMAT SYSTem DATE Returns the current calendar date tdd dd dd This query returns the current calendar date The
174. rument settings 5 133 factory serial port settings 5 132 R RAM 5 89 reading leap second status 5 99 rear panel PORT 1 2 3 Receiver Commands at a Glance 4 2 Receiver identification 4 42 5 135 5 136 Receiver initialization 4 40 receiver operation at a glance 4 29 5 53 5 55 Receiver status screen 5 55 Receiver Status Screen at a Glance 3 17 recovering from holdover 4 27 5 38 5 50 recovering from Holdover 5 38 5 50 recovering the last query response 4 38 5 122 recovery from Holdover 3 16 Reference oscillator 5 89 related documentation 5 18 relay alarm 1 3 4 29 5 53 5 65 5 66 5 68 5 70 5 71 5 72 5 73 5 74 5 75 5 76 5 77 5 78 5 79 5 80 5 81 5 82 5 83 5 84 5 85 5 86 5 87 5 88 removes error from error queue 5 Command Index 10 139 reset to factory defaults 2 9 4 40 5 131 5 132 response PTIMe TCODe 5 93 response message syntax 5 12 response messages 5 11 data types 5 13 restore factory defaults 4 40 restore to factory defaults 2 9 5 131 5 132 revision code 4 42 5 136 RG 213 cable 5 30 RS 232 default values 3 5 RS 232C PORT 1 1 3 PORT 2 1 2 RS232C interface 5 123 5 124 5 125 5 126 5 127 5 128 5 129 RS 232C interface 4 38 5 122 RS 232C ports 2 3 S S 5 9 sample status screen 3 8 satellite acquisition 4 23 4 25 5 7 5 46 5 47 5 48 satellite failure protection 4 27 5 38 5 46 5 47 5 48 satel
175. s 1 2 and 3 The numeric range for each integer is 0 to 256 Context Dependencies SYSTem PRESet clears the time stamp measurement buffers and overflow counts Time stamps are not collected until after the Receiver has completed its powerup and has reached initial GPS lock 59551A SENSe DATA POINts RESPONSE FORMAT Returns the number of time stamps recorded for the one dd specified Time Tag input This query returns the number of time stamps recorded for the one specified Time Tag input Use TSTamp 1 TSTamp 2 or TSTamp 3 to select one input Expanded Syntax SENSe DATA POINts TSTamp 1 or TSTamp 2 or TSTamp 3 Response Returns an integer corresponding to the number of time stamps recorded for the specified input Command Reference 5 74 Command Reference Numeric range is 0 to 256 Parameter TSTamp 1 queries for the number of points in Time Tag 1 input buffer TSTamp 2 queries for the number of points in Time Tag 2 input buffer TSTamp 3 queries for the number of points in Time Tag 3 input buffer Context Dependencies SYSTem PRESet clears the time stamp measurement buffers and overflow counts Time stamps are not collected until after the Receiver has completed its powerup and has reached initial GPS lock 59551A SENSe DATA TSTamp RESPONSE FORMAT Returns a single time stamp d4 This query returns a single time stamp Use TSTamp 1 or TSTamp 2 or TSTamp 3 to selec
176. s proceeds The total downloading time varies depending on the type of PC you have but with communication settings optimized a typical time is about 30 minutes Once the download is under way an estimate of the time to complete the process is updated every 100 S records When the downloading has completed the Minutes Until Finished field will say DONE You can then select Close on the Firmware Download form Receiver Firmware Installation C 4 There are a couple of ways to confirm that the new firmware has been installed the easiest is to just power cycle the unit Once it has powered up you can confirm that the new revision is in place by selecting Query then choosing Product ID from the Control amp Query form and selecting Send Cmd The product ID will appear on the Control amp Query form and should contain the new date code 3503 for example An alternative way to check the download is to type SYST LANG PRIMARY in the edit field on the Control amp Query form and select Send Cmd This will return the unit to normal operating mode without power cycling If you do this you could then check the product ID as described above NOTE it is expected that in early software revisions the alarm will come on the first time you power cycle or switch to primary using SYST LANG PRIMARY If you investigate the alarm you will find it is the software safeguard it has gone off because you have chang
177. s provide supplemental information about satellite position signal strength and health PRN Identification number pseudorandom noise code assigned to the satellite Satellites are sorted by ascending PRNs El Elevation of the satellite degrees predicted by the almanac denotes it is unknown such as when the satellite is not predicted to be visible but is selected for tracking by the sky search algorithm Az Azimuth of the satellite degrees referenced to true north predicted by the almanac if unknown C N Carrier to noise ratio of the received signal The maximum value is 50 35 is the minimum range for stable tracking Acq Locking code and carrier tracking loops to initially acquire the satellite signal Acq Demodulating the satellite broadcast NAV message and determining current time Acq Reading the satellite ephemeris orbital information from the NAV message Ignore The satellite is excluded from the selection process Not OK GPS or Time RAIM reports the satellite is unhealthy Visual User Interface 3 18 e ACQUISITION ACQUISITION profiles the process of acquiring precise time from GPS GPS provides time of day information and a 1PPS reference signal used to discipline the internal oscillator Time Time of day UTC Coordinated Universal Time LOCAL UTC with local time zone offset GPS GPS Time LOCL GPS GPS Time with time zone o
178. s you MUST use either all the upper case letters or the entire word The lower case letters are optional For example POS and POSITION are both valid However POSI is not valid Note POSition is used here as an example but this convention is true for all command keywords In other words the short form of the keywords is shown in uppercase lt n gt The notation lt n gt ending a command keyword indicates a numeric suffix used to differentiate multiple instances of the same structure The numeric suffix is applied to both the short and long forms The valid range for the value n is specified from an enumerated list for example 11213 or from a range for example 1 3 to indicate any of the integers from 1 to 3 TSTamp When you see quotation marks in the command s parameter you must send the 1 quotation marks with the command Command Reference 5 3 Command Reference Description Format Commands and Returns Command Index Required characters are shown in bold type denotes one or more parameters refer to Expanded Syntax for details Identifies a basic fundamental command Product Compatibility if not present the command is supported by both products Default Setting commands only Scope commands only 59551A 1 PULSe STARt DATE Identifies the date when the individual Synopsis Description the pulse sequence is generated at th output f This command identifies t
179. so provided This appendix is organized as follows Command Types Formats and Elements page B 3 Command Types page B 3 Command Formats page B 3 Elements of SCPI Commands page B 4 Using Multiple Commands page B 8 Elements of Response Messages page B 9 Reference Documentation page B 2 Command Syntax and Style B 2 Command Syntax and Style Command Types Format and Elements Command Types Format and Elements Command Types There are two types of GPS Receiver programming commands IEEE 488 2 Common Commands and Standard Commands for Programmable Instruments SCPI The IEEE 488 2 Common Commands control and manage communications between the Receiver and the controller terminal or personal computer The SCPI commands control instrument functions The format of each type of command is described in the following paragraphs Command Formats Common Command Format The IEEE 488 2 Standard defines the Common commands as commands that perform functions like reset self test status byte query and identification Common commands always begin with the asterisk character and may include parameters The command keyword is separated from the first parameter by a space character Some examples of Common commands are as follows IDN ESE 32 SCPI Command and Query Format SCPI commands perform functions like instrument setup A subsystem command has a hierarchical structure that usually consists of a top
180. st use a DTE to DTE interface cable when connecting to a computer These cables are also called null modem modem eliminator or crossover cables Most modems are DCE Digital Communication Equipment devices thus you must use a DTE to DCE interface cable The interface cable must also have the proper connector on each end and the internal wiring must be correct Connectors typically have 9 pins DB 9 connector or 25 pins DB 25 connector with a male or female pin configuration A male connector has pins inside the connector shell and a female connector has holes inside the connector shell To simplify interface cable selections the following sections tells you which cables to use Serial Interface Capabilities 2 5 Serial Interface Capabilities To Connect the GPS Receiver to a PC Laptop or Modem Via the Rear Panel DB 25 Serial Port Connecting to the Personal Computer PC Use an 24542G interface cable or equivalent to connect the Receiver s rear panel PORT 1 DB 25 female connector to a PC or laptop as shown in Figure 2 2 GPS Receiver Rear view F1015 80002 or equivalent 5181 6640 Adapter Computer Figure 2 2 Connecting the GPS Receiver to a Computer Connecting to a Modem Use an HP 40242M interface cable or equivalent to connect the Receiver s rear panel PORT 1 DB 25 female connector to a modem which is a DCE Digital Communica
181. t F Returns the stop bits value of the specified port dd This query returns the stop bits value of specified port Command Reference 5 84 Command Reference Expanded Syntax SYSTem COMMunicate SERial1 SBITs SYSTem COMMunicate SERial2 SBITs Recovering the Last Query Response DIAGnostic QUERy RESPonse RESPONSE FORMAT f TIN F depends on the Returns the last response item issued through the Receivers keisiu S on te asi serial interface for use in an error recovery process This query returns the last response item issued through the Receiver s serial interface for use in an error recovery process In the case of a serial interface data transmission error this query can be used to get the last response item which may otherwise be unavailable because of the side effects of the original command For example the SYST ERRor query removes the oldest entry from the error queue so to see the entry again following a data transmission error use DIAG QUER RESP instead of repeating the original command Response The format depends on the last issued query Receiver Initialization The following commands are provided to allow you to initialize or preset the serial interface port s and the Receiver to their factory shipment values SYSTem COMMunicate SERial1 PRESet SYSTem COMMunicate SERial2 PRESet 59551A Only SYSTem PRESet Command Reference 5 85 Command Reference SYSTem COMMunicate lt port
182. t an input channel Use lt time stamp entry gt to select a single time stamp recorded on that input Expanded Syntax SENSe DATA TSTamp TSTamp 1 or TSTamp 2 or TSTamp 3 lt time stamp entry gt Response The query response represents the single time stamp requested The query response is a sequence of ten comma separated integers constituting a single time stamp The time stamp provides the year month day hours minutes seconds milliseconds microseconds nanoseconds and TFOM Time Figure of Merit For example SENSe DATA TSTamp TSTamp 2 37 Selects the 37th time stamp recorded on Time Tag Input 2 Parameter lt time tag input gt parameter TSTamp 1 to select Time Tag 1 input buffer Command Reference 5 75 Command Reference e TSTamp 2 to select Time Tag 2 input buffer TSTamp 3 to select Time Tag 3 input buffer lt time stamp entry gt parameter range is 1 to 256 Context Dependencies SYSTem PRESet clears the time stamp measurement buffers and overflow counts Time stamps are not collected until after the Receiver has completed its powerup and has reached initial GPS lock Processing Memory Overflows 59551A SENSe DATA MEMory OVERflow COUNt RESPONSE IFORI Returns an overflow count for each of the three Time Tag d dEe inputs This query returns an overflow count for each of the three Time Tag inputs An overflow count occurs after 256 time stamps have been recorded
183. t seconds gt SYNChronization HOLDover DURation THReshold SYNChronization HOLDover DURation THReshold EXCeeded Operating in Holdover Initiating Manual Holdover SYNChronization HOLDover INITiate Recovering from Holdover SYNChronization HOLDover WAITing SYNChronization HOLDover RECovery INITiate SYNChronization HOLDover RECovery LIMit IGNore SYNChronization IMMediate Command Quick Reference 4 16 Operating Status Receiver Operation at a Glance SYSTem STATus SYSTem STATus LENGth Reading the Error Queue SYSTem ERRor Reading the Diagnostic Log DIAGnostic LOG CLEar DIAGnostic _LOG READ ALL AGnostic LOG CLEar lt current log size gt AGnostic _LOG COUNt DIAGnostic LOG READ DIAGnostic LOG READ lt entry number gt Monitoring Status Alarm Conditions Clearing and Presetting Alarms ers STATus PRESet ALARm Reading and Qualifying Alarms LED ALARm SRE lt bit mask gt SRE STB Reading and Qualifying Receiver Status lt register gt OPERation lt register gt QUEStionable lt register gt OPERation HARDware lt register gt OPERation HOLDover lt register gt OPERation POWerup STATus lt register gt CONDition STATus lt register gt EVENt STATus lt register gt ENABle lt bit mask gt STATus lt register gt ENABle STATus lt register gt NTRansition lt bit mask gt STATus lt register gt NTRansition STATus lt register gt PTRansition lt bit mask
184. t the Time Error ranges from 100 to 1000 nanoseconds Response The following table lists the TFOM values that could be returned and provides the corresponding Time Error Command Reference 5 24 Command Reference TFOM Time Error TFOM Time Error Value in nanoseconds Value in nanoseconds The TFOM values 0 1 and 2 are not presently used in the 58503A and 59551A products The 58503A and 59551A products will display TFOM values ranging from 9 to 3 which is consistent with the specified accuracies of each product SYNChronization TINTerval RESPONSE FORMAT Returns the difference or timing shift between the SmartClock d dEe 1 PPS and the GPS 1 PPS signals This query returns the difference or timing shift between the SmartClock 1 PPS and the GPS 1 PPS signals It generates an error when this interval is unavailable That is if no GPS 1 PPS Response Time interval units are seconds Resolution is 1E 10 seconds SYNChronization HOLDover DURation RESPONSE FORMAT Returns the duration of the present or most recent period of d dEe 0 or1 operation in the holdover and holdover processes This query returns the duration of the present or most recent period of operation in the holdover and holdover processes This is the length of time the reference oscillator was not locked to GPS The time units are seconds Response The first number in the response is the holdover duration The duration units are seconds and the r
185. t the serial port on your PC may be assigned to a different Com Port Select the appropriate setting If you are unsure Com1 will be your best bet worst case you can cycle through all of them until it works If you made any changes on this form select OK otherwise you can just Cancel Select CommPort then choose Port Open The main form of the Receiver Status screen is displayed The application will send some commands to the GPS Receiver and then the main form should begin to periodically update every few seconds If you are getting screen updates proceed to the next step Otherwise something is wrong with your CommPort settings or perhaps the physical connection between your PC and the GPS Receiver Prior to download interrogate the product record any custom configuration parameters This step is necessary because downloading new instrument firmware will reset all parameters to system preset defaults Parameters typically recorded include e antenna delay Receiver Firmware Installation C 3 Command Index NOTE e elevation mask angle e time zone offset A table of all system preset defaults is printed on page 5 87 in Chapter 5 of this guide refer to it to identify additional parameters whose default values are inappropriate for your application Record the settings you use prior to download Performing the download works best if the periodic updates are disabled On the main form select the Function menu choose S
186. tatus check mark appears and choose Disable Updates check mark appears Activate the form titled Control amp Query by clicking anywhere on it Select Service then choose Download Firmware This will bring up a form titled Firmware Download Now you need to select the file that you will download Select the control labeled File This brings up a form for file selection Download files for the GPS Receiver have a s appended to the file name This form is set to only find s type files In this case you want to find and select the filename for example s_3503 s Depending on where you have placed this file you may have to use this form to navigate for it If it is on a different drive use the Drives selection in the lower right Once you ve located s_3503 s select it clicking on the name is probably the easiest and then select OK The file along with its path should now appear in the File to Download portion of the Firmware Download form You re now ready to perform the download Select the control titled Download and an erase warning will appear This is just a double check to make sure you really want to do this Assuming you do select Yes Perform the Download The program will switch the GPS Receiver to the INSTALL language erase the flash memory and begin downloading S records The S records are the long character strings that appear in the lower part of the form as the downloading proces
187. tected an error that is not a syntactic error a query error or a semantic error some Receiver operations did not properly complete possibly due to an abnormal hardware or firmware condition These codes are also used for self test response errors The occurrence of any error in this class causes the hardware firmware error bit bit 3 in the Event Status Register to be set Error Messages A 5 Error Messages Query Error An lt error number gt in the range 400 to 499 indicates that the output queue control of the Receiver has detected a problem with the message exchange protocol The occurrence of any error in this class should cause the query error bit bit 2 in the Event Status Register to be set One of the following is true An attempt is being made to read data from the output queue when no output is either present or pending Data in the output queue has been lost General Error Behavior For Commands i e non query doesn t provide a response For any command that has numeric parameters if the value is out of range beyond either the min or max allowed settings the value will be clipped to the appropriate limit and error 222 will be generated data out of range error as an indication that the value wasn t set to the requested value There are some commands having numeric parameters where the clipping behavior described above doesn t make sense These include the satellite include and ignore com
188. tended search process that may increase time to reach GPS lock You can halt the extended search by cycling the Receiver power you may need to leave power off for greater than five seconds To Connect PC to the Receiver 1 Although this isn t necessary for the Receiver to attain GPS lock connect the GPS Receiver to the serial port of a PC via the Receiver s rear panel PORT 1 RS 232C port to observe the progress of the Receiver Use an HP 24542G interface cable or equivalent as shown in Figure 3 1 GPS Receiver Personal Rear view Computer or Laptop Figure 3 1 Connecting the GPS Receiver to a Computer 2 Turn the PC on You will need to run a terminal emulation or telecommunication program on your PC in order to communicate via the RS 232C serial port Most PCs contain a terminal emulation program especially PCs equipped with Windows If your PC does not contain a telecommunication program purchase one of the following programs PROCOMM PLUS DATASTORM Technologies Inc PROCOMM PLUS for Windows Cross Talk Hayes Visual User Interface 3 4 Visual User Interface or any other terminal emulation program Note Symmetricom is not endorsing any of these products If you are using a Windows based PC perform procedure in the subsection titled To Configure Terminal Communications for Windows based PC on page 3 5 If you are using a DOS based PC no Windows appli
189. ter the For example consider the GPS REF ADEL query If you send the query without specifying a parameter GPS REF ADEL the present antenna delay value is returned If you send the MIN parameter using GPS REF ADEL MIN the command returns the minimum value currently available If you send the MAX parameter the command returns the maximum value currently available Be sure to place a space between the question mark and the parameter Suffixes Command Syntax and Style B 6 Command Syntax and Style Command Types Format and Elements A suffix is the combination of suffix elements and multipliers that can be used to interpret the lt numeric value gt sent If a suffix is not specified the Receiver assumes that lt numeric value gt is unscaled that is Volts seconds etc For example the following two commands are equivalent GPS REF ADELay 100 NS GPS REF ADELay 100E 9 Suffix Elements Suffix elements such as HZ Hertz S seconds V Volts OHM Ohms PCT percent and DEG degrees are allowed within this format Suffix Multipliers Table B 2 lists the suffix multipliers that can be used with suffix elements except PCT and DEG Table B 2 Suffix Multipliers Bermon wweWoNG wame hee E SS The suffix units MHZ and MOHM are special cases that should not be confused with lt suffix multiplier gt HZ and lt suffix multiplier gt OHM Command Syntax and Style B 7 Command Syntax and Style
190. ting system 5 65 status alarm reporting system 5 65 description format 5 5 diagnostic log 4 29 5 53 5 59 5 60 5 61 5 63 5 64 diagnostic Log messages 5 59 diagnostic test 5 90 diagnostic tests 4 30 5 54 5 89 5 90 5 91 General Index 6 result 5 91 diagnostics internal self test 5 89 diagram serial interface cable 2 8 Diagram 5 68 documents list 5 18 related 5 18 download 5 137 downloading Using SatStat 5 3 downloading new firmware 5 3 DTE 2 5 duplex state 5 125 5 126 E echoing of the characters you type 5 125 5 126 5 132 EEPROM 5 89 5 138 EPROM 5 89 erasing EEPROM 5 139 error hardware firmware error 5 5 query 5 6 semantic 5 5 syntactic 5 4 error analysis 4 29 5 53 5 54 5 57 5 139 error behavior 5 6 error log 4 29 5 53 5 54 5 57 5 139 error messages 4 29 5 53 error queue 4 29 5 53 5 57 5 139 5 3 error recovery serial port 4 29 4 38 5 53 5 130 error types 5 4 error types list 5 4 General Index error command 5 65 5 72 error reading 5 2 external devices 1 3 F factory default settings 2 9 3 5 4 40 5 131 5 132 factory default values 2 9 failure of merit 4 27 failure protection satellite loss 4 27 5 38 5 46 5 47 5 48 FDUPlex 5 125 5 126 FFOM 4 27 5 41 Figure command list 4 2 status reporting system 5 68 figure of merit 5 41 5 44 5 93 firmware error 5 5 fi
191. tion N 0 0 0 E 0 0 0 0 NV LAST is also set to this position NV GPS POSition HOLD LAST N 0 0 0 E 0 0 0 0 NV GPS POSition HOLD STATe 0 NV GPS POSition SURVey STATe ONCE GPS POSition SURVey STATe POWerup ON NV GPS REFerence ADELay 0 NV GPS SATellite TRACking EMANgle 0 NV GPS SATellite TRACking IGNore STATe for every PRN GPS SATellite TRACking IGNore No satellites ignored NV GPS SATellite TRACking INCLude ites i NV GPS SATellite TRACking INCLude STATe for every PRN PTIMe TZONe NV PULSe CONTinuous PERiod NV PULSe CONTinuous STATe FF NV PULSe STARt DATE 994 1 1 NV PULSe STARt TIME 0 0 NV SENSe DATA Data is cleared SENSe DATA MEMory OVERflow COUNt All counts are cleared V SENSe DATA MEMory SAVE FIRSt NV SENSe DATA POINts All responses become 0 zero SENSe DATA TSTamp All timestamps cleared NV stands for non volatile memory FKV stands for volatile memory Command Reference 5 87 Command Reference Table 5 2 System Preset Factory Default Parameter Settings Summary Continued STATus OPERation ENABIle 36 NV STATus OPERation HARDware ENABle 191 NV STATus OPERation HARDware NTRansition STATus OPERation HARDware PTRansition 119 NV STATus OPERation HOLDover NTRansition STATus OPERation HOLDover PTRansition oj ja jo HAE SIS a 2 S STATus OPERation NTRansition
192. tion Visual User Interface 3 7 Visual User Interface The computer displays the status screen as shown in the sample status screen in Figure 3 2 Note that you must re enter the SYSTEM STATUS command each time you want an updated status screen See the section titled Using and Reading the Receiver Status Screen on page 3 10 of this guide for a description of how to use and read the satellite acquisition information displayed in the status screen Receiver Status SYNCHRONIZAT Outputs Valid Reduced Accuracy SmartClock Mode Reference Outputs gt gt Locked to GPS stabilizing frequency TFOM 6 FFOM 1 Recovery 1PPS TI 71 ns relative to GPS Holdover HOLD THR 1 000 us Power up Holdover Uncertainty Predict ACQUISITI GPS 1PPS Valid Tracking 5 Tracking PRN El Az C N El Az 2 70 337 49 11 292 UTC 17 56 44 31 Jan 1996 7 46 188 48 24 243 GPS 1PPS Synchronized to UTC 15 33 82 38 be ANT DLY 0 ns 19 28 113 36 Position 22 65 91 49 MODE Survey 1 2 complete AVG LAT N 37 19 34 746 AVG LON W 121 59 50 502 ELEV MASK 10 deg AVG HGT 34 14 m GPS HEALTH MONITOR Self Test OK J OCXO OK EFC OK GPS Rev OK Figure 3 2 Sample Status Screen To Install the Automated SatStat Program for Continual Status Updates This Windows program provides among other things continual status updates of the Receiver Status Screen Your PC must have Windows installed to operate the pro
193. tion 4 40 receiver operation at a glance 4 29 5 53 5 55 Receiver status screen 5 55 Receiver Status Screen at a Glance 3 17 recovering from holdover 4 27 5 38 5 50 recovering from Holdover 5 38 5 50 recovering the last query response 4 38 5 122 General Index 11 General Index recovery from Holdover 3 16 Reference oscillator 5 89 related documentation 5 18 relay alarm 1 3 4 29 5 53 5 65 5 66 5 68 5 70 5 71 5 72 5 73 5 74 5 75 5 76 5 77 5 78 5 79 5 80 5 81 5 82 5 83 5 84 5 85 5 86 5 87 5 88 removes error from error queue 5 139 reset to factory defaults 2 9 4 40 5 131 5 132 response PTIMe TCODe 5 93 response message syntax 5 12 response messages 5 11 data types 5 13 restore factory defaults 4 40 restore to factory defaults 2 9 5 131 5 132 revision code 4 42 5 136 RG 213 cable 5 30 RS 232 default values 3 5 RS 232C PORT 1 1 3 PORT 2 1 2 RS232C interface 5 123 5 124 5 125 5 126 5 127 5 128 5 129 RS 232C interface 4 38 5 122 RS 232C ports 2 3 S S 5 9 sample status screen 3 8 satellite acquisition 4 23 General Index 12 4 25 5 7 5 46 5 47 5 48 satellite failure protection 4 27 5 38 5 46 5 47 5 48 satellite loss 4 27 5 46 5 47 5 48 satellite management 4 23 4 25 5 7 5 9 5 10 5 12 5 13 5 15 5 17 5 19 5 21 5 23 5 25 5 27 5 28 5 29 5 30 5 32 5 33 5 35 5 37 5 46 5 4
194. tion Equipment device as shown in Figure 2 3 Serial Interface Capabilities 2 6 CAUTION Serial Interface Capabilities GPS Receiver Rear view Modem set to Telephone 40242M Auto Answer Line Figure 2 3 Connecting the GPS Receiver to a Modem To Connect the 59551A to a Laptop Computer Via the Front Panel DB 9 Serial Port Use the 9 pin f to miniature 9 pin f RS 232C interface cable supplied for the laptop computer and a straight through type of 9 pin male to male adapter to connect the 59551A Module s front panel PORT 2 DB 9 female connector to a laptop computer as shown in Figure 2 4 The 9 pin male to male adapter should be wired as shown in Figure 2 5 Pins 2 3 and 5 should be straight through pin connections no crossover of pins 59551A Computer Figure 2 4 Connecting the 59551A to Laptop Computer Serial Interface Capabilities 2 7 Serial Interface Capabilities If you choose to make your own cable see figures 2 5 and 2 6 Figures 2 5 and 2 6 illustrate the 24542U cable 9 pin female to 9 pin female connectors and the 24542G cable 25 pin male to 9 pin female connectors respectively Each of these cables are null modem cables Note that pins 2 and 3 of the 24542G 25 pin male to 9 pin female cable shown in Figure 2 6 DO NOT cross nevertheless this cable is a null modem cable Data Data Terminal Commun
195. tricom com Warning Symbols Used In This Book A Instruction manual symbol the product will be marked with this symbol when it is necessary for the user to refer to the instruction manual 1 Indicates hazardous voltages ale Indicates earth ground terminal E Indicates terminal is connected to chassis when such connection is not apparent 4 Indicates Alternating current Indicates Direct current Contents Warning Symbols Used In This Book Chapter 1 Front and Rear Panels at a Glance 59551A Front Panel at a Glance 59551A Rear Panel at a Glance 58503A Front Panel at a Glance 58503A Rear Panel at a Glance Chapter 2 Serial Interface Capabilities About the RS 232C Serial Port s PORT 1 Rear Panel PORT 2 Front Panel RS 232C Serial Port 59551A Only Connecting a Computer or Modem To Connect the GPS Receiver to a PC Laptop or Modem Via the Rear Panel DB 25 Serial Port Connecting to the Personal Computer PC Connecting to a Modem To Connect the 59551A to a Laptop Computer Via the Front Panel DB 9 Serial Port Configuring the RS 232C Port s If You Need To Make Changes to the Serial Port Settings Configuring PORT 1 Configuring PORT 2 59551A Only If Changes Have Already Been Made to the ii AO OOD 10 10 11 Contents Serial Port Settings Chapter 3 Visual User Interface Chapter Contents Overview of the Visual User Interface Setting Up the GPS Receiver To Conne
196. ut ION VOLATILE This command identifies the date when the individual pulse or first pulse of the pulse sequence is generated at the Programmable Pulse output Expanded Syntax PULSe STARt DATE lt four digit year gt lt month gt lt day gt Parameter The lt four digit year gt range is 1994 to 3000 e The lt month gt range is 1 to 12 The lt day gt range is 1 to 31 Context Dependencies If you select a date and time which occurs prior to the current time or prior to the completion of powerup and first GPS lock the Receiver will not successfully find a start and therefore will produce no pulses If the Receiver has been set up to use a time zone offset to produce local date and time the parameters provided should also be expressed as local date and time 59551A PULSe STARt DATE RESPONSE FORMAT Returns the date when the individual pulse or first pulse of the dd dd dd pulse sequence is generated at the Programmable Pulse output This query returns the date when the individual pulse or first pulse of the pulse sequence is generated at the Programmable Pulse output This query returns year month and day Response Three fields are separated by commas lt four digit year gt lt month gt lt day gt The lt four digit year gt range is 1994 to 3000 The lt month gt range is 1 to 12 e The lt day gt range is 1 to 31 Command Reference 5 68 Command Reference 59551A PULS
197. ut will not be tracked Expanded Syntax GPS SATellite TRACking EMANgle lt degrees gt Parameter lt degrees gt range is 0 degrees horizon to 89 degrees The resolution is 1 degree The maximum recommended value while the position is being surveyed is 15 degrees to allow tracking of four satellites needed for an accurate position determination Once the survey is complete the elevation mask angle can be increased to avoid interference problems caused by buildings and trees and minimize effects of multipath if necessary Values above 40 degrees severely limit GPS signal availability and are not recommended GPS SATellite TRACking EMANgle RESPONSE FORMAT Returns the GPS elevation mask angle value dd This query returns the GPS elevation mask angle value Response The range is 0 degrees to 89 degrees GPS SATellite TRACking IGNore SYSTem PRESet Adds the specified satellites to the list that the Receiver ignores 5 7 for tracking ION VOLATILE This command adds the specified satellites to the list that the Receiver ignores for tracking Each satellite is identified by its pseudorandom noise code PRN Command Reference 5 13 Command Reference Expanded Syntax GPS SATellite TRACking IGNore lt PRN gt lt PRN gt GPS SATellite TRACking IGNore NONE GPS SATellite TRACking IGNore ALL Parameter lt PRN gt parameter is the pseudorandom noise code of the satellite s
198. which appear in italic Parameter Syntax 1 lt position gt N orS lt latitude degree gt lt latitude minute gt lt latitude second gt E orW lt ongitude degree gt lt longitude minute gt lt longitude second gt lt height above mean sea level in meters gt 2 lt specific test gt DISPlay or PROCessor or RAM or EEPRom or UART or QSPI or FPGA or INTerpolator or IREFerence or GPS or POWer 3 lt data set gt TSTamp 1 or TSTamp 2 or TSTamp 3 4 lt rate gt 1200 or 2400 or 9600 or 19200 5 lt parity gt EVEN or ODD or NONE Command Quick Reference 4 17 Command Quick Reference Receiver Commands at a Glance Command Quick Reference 4 18 Command Reference Command Reference Chapter Contents This chapter provides a description of each command that can be used to operate the GPS Receiver The commands are grouped by functions The functions are grouped and ordered the same as they are in Chapter 4 Command Quick Reference and on the foldout Receiver Commands at a Glance This chapter is organized as follows e Command Syntax Conventions page 5 3 e Description Format page 5 4 Commands and Returns page 5 4 Query Specific Information page 5 5 e GPS Satellite Acquisition page 5 6 Facilitating Initial Tracking page 5 7 Establishing Position page 5 9 Selecting Satellites page 5 13 Compensating for Antenna Delay page 5 17 Monitoring Acquisition page 5 19 1

59551A GPS Measurements Synchronization

Contents

Download Pdf Manuals

Related Search

Related Contents