FireFly-1A User Manual - Jackson Labs Technologies, Inc.
Contents
1. 4 3 PTIMe TIME 11 3 4 4 PTIMe TIME STRing 11 3 4 5 PTIMe TINTerval eee 11 3 4 6 PTIME D ee ee ee a ol 8 5 SYNChronization Subsystem yos de a ll 3 5 1 SYNChronization SOURce MODE GPSIEXTemalAUTO a a e eed 3 5 2 SYNChronization HOLDover DURation O we ae 3 5 3 SYNChronization HOLDover INITiate as a a a e 3 5 4 SYNChronization HOLDover nt INITiate E ame 2 3 5 5 SYNChronization TINTerval D du D le 3 5 6 SYNChronization IMMEdiate 12 3 5 7 SYNChronization FEEstimate 12 3 5 8 SYNChronization LOCKed 13 3 5 9 SYNChronization health 13 2011 Jackson Labs Technologies Inc 1 FireFly 1A User Manual 8 5 10SYNChronization 3 6 DIAGnostic Subsystem 8 6 1 DIAGnostic ROSCillator EFControl RELative 3 6 2 DIAGnostic ROSCillator EFControl ABSolute 3 7 MEASURE Subsystem 3 7 1 MEASure VOLTage 3 7 2 MEASure CURRent 3 7 3 MEASure 3 8 SYSTEM Subsystem 3 8 1 SYSTem COMMunicate RCE 3 8 1 1 SYSTem COMMunicate SERial ECHO A 3 8 1 2 SYSTem COMMunicate SERial PROmpt 3 8 1 3 SYSTem COMMunicate SERial BAUD 3 8 2 SYSTem STATus 3 8 3 SYSTem did ONCE 3 9 SERVO Subsystem 3 9 1 SERVo COARSeDac 3 9 2 SERVo DAC2. EFC frequency slope This command has the following format SERVo SLOPe lt NEG POS gt 3 9 6 SERVo TEMPCOmpensation This parameter is a coefficient that reflects the correlation between the Current provided to the OCXO and the EFC This coefficient is automatically computed and adjusted over time by the Jackson Labs Technologies Inc firmware This command has the following format SERVo TEMPCOmpensation lt float gt 4000 0 4000 0 3 9 7 SERVo AGINGcompensation This parameter is a coefficient that represents the drift of the EFC needed to compensate the natural drift in frequency of the OCXO due to aging This coefficient is automatically computed and adjusted over time by the Jackson Labs Technologies Inc firmware This command has the following format SERVo AGINGcompensation lt float gt 10 0 10 0 3 9 8 SERVo PHASECOrrection This parameter sets the Integral part of the PID loop Loop instability will result if the parameter is set too high Typical values are 10 0 to 30 0 This command has the following format SERVo PHASECOrrection lt float gt 100 0 100 0 3 9 9 SERVo 1PPSoffset This command sets the FireFly 1A 1PPS signal s offset to UTC in 16 7ns steps Using the SERV 1PPS command results in immediate phase change of the 1PPS output signal This command has the following format SERVo 1PPSoffset lt int gt ns O 2011 Jackson Labs Technologies Inc 17 FireFly 1A User Manual Jackson Labs 3
3. There are a number of commands that can be used as listed below Most of these are identical or similar to Symmetricom 58503 A commands To get a listing of the available commands send the HELP query This will return a list of all the available commands for the FireFly 1A GPSDO Additional information regarding the SCPI protocol syntax can be found on the following web site http www scpiconsortium org Please refer to the document SCPI 99 pdf for details regarding individual SCPI command definitions A basic familiarity with the SCPI protocol is recommended when reading this chapter 3 2 General SCPI Commands 3 2 1 IDN This query outputs an identifying string The response will show the following information lt company name gt lt model number gt lt serial number gt lt firmware revision gt 3 2 2 HELP This query returns a list of the commands available for the FireFly GPSDO 3 3 GPS Subsystem Note Please note that FireFly 1A displays antenna height in MSL Meters rather than in GPS Meters on all commands that return antenna height the legacy Fury GPSDO uses GPS height 2011 Jackson Labs Technologies Inc 7 FireFly 1A User Manual Jackson Labs The GPS subsystem regroups all the commands related to the control and status of the GPS receiver The list of the commands supported is the following GPS SATellite TRAcking COUNt GPS SATellite VISible COUNt GPS GPGGA lt int gt 0 255 GPS GGASTat lt int
4. oscillator It returns a percentage value between 100 to 100 3 6 2 DIAGnostic ROSCillator EFControl ABSolute This query returns the Electronic Frequency Control EFC output value of the internal reference oscillator It returns a value in volts between 0 and 5 V 3 7 MEASURE Subsystem This subsystem regroups the queries related of some parameters that are measured on board on the FireFly 1A The list of the commands supported for this subsystem is the following MEASure VOLTage MEASure CURRent MEASure 3 7 1 MEASure VOLTage This command is not supported in FireFly 1A and will return undetermined values 14 O 2011 Jackson Labs Technologies Inc Jackson FireFly 1A User Manual Labs 3 7 2 MEASure CURRent This query returns the current drawn by the OCXO This current varies in order to keep a stable temperature inside the OCXO 3 7 3 MEASure This query returns the result of the two following queries MEASure VOLTage MEASure CURRent 3 8 SYSTEM Subsystem This subsystem regroups the commands related to the general configuration of the FireFly 1A The list of the commands supported for this subsystem follows SYSTem COMMunicate SERial ECHO lt ON OFF gt SYSTem COMMunicate SERial PROmpt lt ON OFF gt SYSTem COMMunicate SERial BAUD lt 9600 19200 38400 57600 115200 gt SYSTem STATus SYSTem FACToryReset ONCE 3 8 1 SYSTem COMMunicate 3 8 1 1 SYSTem COMMunicate SERial ECHO This command
5. performance GPS receiver that can acquire and track up to 50 GPS signals down to a state of the art 160dBm a 32bit processor that runs a Real Time OS a low noise sine wave 1OMHz output 1PPS UTC synchronized output RS 232 control interface precision voltage references and DACs 1 2 General Safety Precautions The following general safety precautions must be observed during all phases of operation of this instrument Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design manufacture and intended use of the instrument Jackson Labs Technologies Inc assumes no liability for the customer s failure to comply with these requirements 1 2 1 Grounding To avoid damaging the sensitive electronic components in the FireFly 1A GSPDO always make sure to discharge any built up electrostatic charge to a good ground source such as power supply ground This should be done before handling the circuit board or anything connected to it i e the GPS antenna 1 2 2 Power Connections Make sure to connect the DC power to the device following the polarity indicated in Section 2 1 Do not reverse the power pins as this will cause serious damage to the circuit board 1 2 3 Environmental Conditions This instrument is intended for indoor use It is designed to operate at a maximum relative non condensing humidity of 95 and at altitudes of up to 4000 meters Refer to the specification
6. voltage is too low HEALTH STATUS l 0x80 If the short term drift ADEV 100s gt 100ns HEALTH STATUS l 0x100 For the first 7 minutes after a phase reset or a coarsedac change HEALTH STATUS l 0x200 As an example if the unit is in GPS holdover and the OCXO voltage is too high and the UTC phase offset is gt 250ns then the following errors would be indicated 1 UTC phase gt 250ns 0x4 2 OCXO voltage too high 0x40 3 GPS in holdover 0x10 Oring these values together results in 0x40 0x10 0x4 0x54 The unit would thus indicate HEALTH STATUS 0x54 A health status of 0x0 indicates a properly locked and warmed up unit that is completely healthy 2011 Jackson Labs Technologies Inc 13 FireFly 1A User Manual Jackson Labs 3 5 10 SYNChronization This query returns the results of these six queries SYNChronization SOURce MODE SYNChronization SOURce STATE SYNChronization LOCKed SYNChronization HOLDover DURation SYNChronization FEEstimate SYNChronization TINTerval SYNChronization health 3 6 DIAGnostic Subsystem This subsystem regroups the queries related to the diagnostic of the OCXO The list of the commands supported for this subsystem is as follows DIAGnostic ROSCillator EFControl RELative DIAGnostic ROSCillator EFControl ABSolute 3 6 1 DIAGnostic ROSCillator EFControl RELative This query returns the Electronic Frequency Control EFC output value of the internal reference
7. with the settings press the Export button 2011 Jackson Labs Technologies Inc 35 FireFly 1A User Manual Jackson Labs 5 4 Interpreting the Data Figure 5 5 shows the data acquired by the FireFly 1A unit over a period of more than 200 hours The red trace is EFC crystal frequency control voltage The crystal is aging becoming faster in frequency over time This requires the control voltage to be lowered to maintain 10 0MHz exactly A drift of 2mV is visible over 200 hours On the left side of the screen the EFC range over this 200 hour plot is displayed vertically as 0 00193V This means the drift of the EFC voltage due to aging is 88mV per year The EFC sensitivity of the crystal is about 8Hz per volt so the crystal ages at 8Hz V 0 088 V Year 0 704Hz Year drift At 10MHz 0 704Hz 1OMHz 7 04E 08 aging rate per year This is the same as 0 2ppb drift due to aging per day This crystal aging is fully compensated by the firmware with and without GPS reception of course The OCXO heater current is shown in turqoise We can see it ranges from 0 135607A to 0 178146A The OCXO current jumps lower every 24 hours because the unit is sitting next to a window and the sun shines onto the OCXO in the evenings heating it up and thus making the unit use lower power during that event In Figure 5 6 which is a zoom of Figure 5 5 we can see the phase offset error of the internal OCXO to the UTC GPS reference We can see the maxim
8. 9 10 SERVo TRACe This command sets the period in seconds for the debug trace Debug trace data can be used with Ulrich Bangert s Plotter utility to show UTC tracking versus time etc This command has the following format SERVo TRACe lt int gt 0 255 An example output is described here 08 07 31 373815 60685 32 08 2 22E 11 14 10 6 0x54 date 1PPS Count Fine DAC UTC offset ns Frequency Error Estimate Sats Visible Sats Tracked Lock State Health Status Please see the SYNChronization command for detailed information on how to decode the health status indicator values Note health status information is available with firmware versions 0 913 and later The Lock State variable indicates one of the following states Value State 0 OCXO warmup 1 Holdover 2 Locking OCXO training 4 Value not defined 5 Holdover but still phase locked stays in this state for about 100s after GPS lock is lost 6 Locked and GPS active 3 9 11 SERVo 18 This command returns the result of the following queries SERVo COARSeDac SERVo DACGain SERVo EFCScale SERVo EFCDamping SERVo SLOPe SERVo TEMPCOmpensation 2011 Jackson Labs Technologies Inc Jackson FireFly 1A User Manual abs SERVo AGINGcompensation SERVo PHASECOrrection SERVo 1PPSoffset SERVo TRACe 2011 Jackson Labs Technologies Inc 19 FireFly 1A User Manual 20 Jackson ii 2011 Jackson Labs Tec
9. E ONLY File ISP Options Tools Help TENET ODEI ARM Cortex LPC900 2 clock 80051 80051 XA www esacademy com fag docs C Expand the ARM7 folder and select the appropriate processor in this case the LPC2138 26 O 2011 Jackson Labs Technologies Inc J ac k 5 ony FireFly 1A User Manual abs Figure 4 6 Expanded device selection window b Flash Magic NOM PROOUCTE Ble GP Options Tools Help OO AIGvE gt e Fee JE D Select the Baud Rate of the Flash Magic utility to be 38400 or slower Faster Baud rates will not work properly E Set the Oscillator MHz to 10 F Check the box marked Erase blocks used by Hex File Warning Make sure NOT to check the box marked Erase all Flash Code Rd Prot under any circumstances this may erase factory calibration data and the unit will not operate and will have to be returned to the factory Checking this box on the ISP utility will thus void the warranty G Under Step 3 Hex File browse for the hex file that you downloaded in step 4 4 H Go to Step 5 and press Start You wil observe the firmware being downloaded to the FireFly 1A 4 5 Verifying Firmware Update Remove the jumper from header J2 and power cycle the unit Both LED s should blink During power on the unit sends an ID string out of the serial port at 115200 Baud by default The firmware version can also be queried by sending the IDN comman
10. Flew 213 E Timan EN Fite cu 00025 Span mins 15000 al Tune Map Gisp ra toits LE Mes sala M 41419 90 Phi W liiin 48 1 3 5 Le b a0 aF ae 1727 H Ao TE 9 18 he Sed ie A D Logt Flogetooun M Trareltetine codes OU 95 pus 76622 0006106 4 072206 000630 gee paea F mwar FOIE pa Pag ff r M Condal esd ena queue M Flash LED ES La em ete 5 3 4 Exporting the graphics The settings which control the mode of the Export function are contained in the Options dialog Export allows you to create an image file of either the graph or the satellite map You select which you want using the radio buttons If you select Graph you have the option to export only that which is currently visible or to export the graph which is a plot of the entire logfile contents Use the checkbox All to make this choice You may nominate a size in X and Y The file format may be BMP JPG GIF or PNG Your settings will be stored and will be the default next time you open this dialog If you choose to export the graph you might want to override the TI max setting in force on the screen display You may do this by entering a non zero value into the Override TI control A value of zero causes the export to take the same setting if any as the screen display The export may be done automatically on a timed basis Simply enter a non zero value in seconds to choose an export time interval To manually export in accordance
11. GPS This query displays the configuration position speed height and other relevant data of the GPS receiver in one convenient location 3 4 PTIME Subsystem The PTIME subsystem regroups all the commands related to the management of the time The list of the commands supported is the following PTIMe TZONe PTIMe DATE PTIMe TIME PTIMe TIME STRing PTIMe TINTerval PTIME 3 4 1 PTIMe TZONe Returns the local time zone offset 3 4 2 PTIMe DATE This query returns the current calendar date The local calendar date is referenced to UTC time The year month and day are returned 10 O 2011 Jackson Labs Technologies Inc Jackson FireFly 1A User Manual Labs 3 4 3 PTIMe TIME This query returns the current 24 hour time The local time is referenced to UTC time The hour minute and second is returned 3 4 4 PTIMe TIME STRing This query returns the current 24 hour time suitable for display for example 13 24 56 3 4 5 PTIMe TINTerval This query is equivalent to the command SYNChronization TINTerval 3 4 6 PTIME This query returns at once the result of the four following queries PTIME DATE PTIME TIME PTIME TZONE PTIME TINTerval 3 5 SYNChronization Subsystem This subsystem regroups the commands related to the synchronization of the FireFly 1A with the GPS receiver The list of the commands supported for this subsystem is the following SYNChronization SOURce MODE GPSIEXTernall AUTO SY
12. Gain 3 9 3 SERVo EFCScale 3 9 4 SERVo EFCDamping 3 9 5 SERVo SLOPe 3 9 6 SERVo TEMPCOmpensation 3 9 7 SERVo AGINGcompensation 3 9 8 SERVo PHASECOrrection 3 9 9 SERVo 1PPSoffset 3 9 10SERVo TRACe 3 9 11SERVo Firmware Upgrade Instructions 4 1 Introduction 4 2 ISP Flash Loader Utility installation 4 2 1 Philips LPC2000 Flash Utility 4 2 2 Flash Magic Flash Programming Utility 4 3 Putting the PCB into In Circuit aes mode 4 4 Downloading the firmware 4 4 1 Philips LPC2000 Flash Utility 4 4 2 Flash Magic Flash nn uti 4 5 Verifying Firmware Update GPSCon Utility 5 1 Description 5 2 Installation 5 3 Using GPSCon 5 3 1 Setting the options 5 3 1 1 Communication Parameters 5 3 1 2 Auxiliary parameters 5 3 1 3 Other options 5 3 2 Sending manual commands to the receiver 5 3 3 Use of the mouse in graph mode 5 3 4 Exporting the graphics 5 4 Interpreting the Data 21 21 21 21 21 22 22 22 24 rer 2011 Jackson Labs Technologies Inc Jackson sis 6 Certification and Nano 6 1 Certification 6 1 1 Warranty 6 1 2 Limitation of Warranty 6 1 3 Exclusive Remedies 2011 Jackson Labs Technologies Inc FireFly 1A User Manual 111 FireFly 1 A User Manual J ack Ss ony abs iv 2011 Jackson Labs Technologies Inc Jackson FireFly 1A User Manual Labs Introduction 1 1 Overview The FireFly 1A GPSDO includes an extremely high
13. Inc or a service facility designated by Jackson Labs Technologies Inc Customer shall prepay shipping charges and shall pay all duties and taxes for products returned to Jackson Labs Technologies Inc for warranty service Except for products returned to Customer from another country Jackson Labs Technologies Inc shall pay for return of products to Customer If Jackson Labs Technologies Inc is unable within a reasonable time to repair or replace any product to condition as warranted the Customer shall be entitled to a refund of the purchase price upon return of the product to Jackson Labs Technologies Inc 6 1 2 Limitation of Warranty The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by the Customer Customer supplied software or interfacing unauthorized modification or misuse opening of the instruments enclosure or removal of the instruments panels operation outside of the environmental or electrical specifications for the product or improper site preparation and maintenance JACKSON LABS TECHNOLOGIES INC SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR O 2011 Jackson Labs Technologies Inc 37 FireFly 1A User Manual Jackson Labs PURPOSE No license express or implied by estoppel or otherwise to any intellectual property rights is granted by this document Jackson Labs Technologies Inc products are not intended for use in med
14. Jackson he FireFly 1A User Manual Document 80200501 FireFly 1A User Manual Copyright 2010 2011 Jackson Labs Technologies Inc Jackson FireFly 1A User Manual Labs 1 Introduction 1 1 1 Overview 1 1 2 General Safety Precautions 1 1 2 1 Grounding 1 2 2 Power Connections d 1 2 3 Environmental Conditions 1d 2 Quick Start Instructions 8 2 1 Powering Up the Unit 3 2 1 1 Major connections 3 2 2 Coaxial Connector types 4 2 3 Connecting the GPS Antenna 4 2 4 Remote serial control 5 2 4 1 Help and command overview 5 2 4 2 Loop parameter adjustment 5 3 SCPI Control Quick Start Instructions lt 7 3 1 Introduction 7 3 2 General SCPI Commands 7 3 2 1 IDN 7 3 2 2 HELP 7 3 3 GPS Subsystem 7 3 3 1 GPS SATellite 8 3 3 2 GPS SATellite TRAcking COUN 8 3 3 3 GPS SATellite VISible COUNt 8 3 3 4 NMEA Support 8 3 3 5 GPS GPGGA 9 3 3 6 GPS GGASTat 9 3 3 7 GPS GPRMC 9 3 3 8 GPS XYZSPeed yi Ge a ey ete a le ae es a ete fe oO 3 3 9 GPS POSition 2 a 10 3 3 10GPS RESET ONCE 10 33 1TGPRS eee ea ha ns A da pe ae a wl amp 410 3 4 PTIME Subsystem a 10 3 4 1 PTIMe TZONe a 10 3 4 2 PTIMe DATE 10 3
15. Log sal court FF Tio GPS F Log PU FF Translate pra codes O Denant sad emr queus FT Aad LED FF Us biman FF Statistics A Sheer best os ERC 7 ANSI fort in statua Time CS ra Fier cost ous 2011 Jackson Labs Technologies Inc Jac ks On abs FireFly 1A User Manual Figure 5 2 Setting the communications parameters Pathe songe FTF Enar Coma Tina services Austery Aue come Export graptics Remote corral Por Bud Panty f msm Pra Cta Bits Stop Bis B 1 M ROHFF C RTACTS 2011 Jackson Labs Technologies Inc 31 FireFly 1A User Manual Jackson abs Figure 5 3 Auxiliary Parameters window Paths amp settings FTP Email Coms Time services Awdliary Aux coms Export graphics Remote control nite een 2nd port enor request sting SYST ERR lt CR gt 7 Enable second serial port 2nd port OK prompt scpi lt SPC gt gt lt SPC gt Wildcard for any character type is 7 Wildcard for numeric character is Y Camiage retum is 2nd port error prompt E7 H gt lt SPC gt lt CR gt Linefeed is lt LF gt Aux request string meas curent lt CR gt M Log Aux1 or Log Max SS Aux2 request string FHDATAET lt CR gt TF Log Aux2 or Log Min SS Aux3 request string DATAE4 lt CR gt T Log Aux3 rm Traces to be visible on the graph EFC Label Mag Offset Fan M Ant PCXO cur fi fo F Sas D Aus fi fo 5 3 1 3 Other options The other tabs in t
16. NChronization SOURce STATE SYNChronization HOLDover DURation SYNChronization HOL Dover INITiate SYNChronization HOLDover RECovery INITiate SYNChronization TINTerval SYNChronization IMMEdiate SYNChronization FEEstimate SYNChronization LOCKed SYNChronization 3 5 1 SYNChronization SOURce MODE GPS EXTernal AUTO The board may be configured lock to an external 1PPS source or the internal GPS receiver A small through hole pad next to the SMA connectors labeled 1PPS IN may be used to feed an external CMOS rising edge 1PPS signal with OV lt x lt 5V signal level and lus minimum pulse width into the unit Use one of the various ground pins on the board as a 1PPS signal return O 2011 Jackson Labs Technologies Inc 11 FireFly 1A User Manual Jackson Labs By default the unit is set to GPS It may be hard coded to only use the external 1PPS source by setting EXT or it may be auto switched to the external 1PPS signal if the internal GPS receiver does not generate 1PPS pulses for longer than 15 seconds if the signal is too week or there is a GPS failure When set to the AUTO setting the unit will switch back to the internal GPS receiver once 1PPS pulses are generated internally again 3 5 2 SYNChronization HOLDover DURation 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
17. OK on the utility window s button Warning DO NOT PRESS THE ERASE BUTTON AT ANY TIME THIS WILL RENDER THE PCB USELESS AND CAN ONLY BE RECOVERED AT THE FACTORY 4 4 2 Flash Magic Flash Programming Utility A Open the Flash Magic utility Set the COM port in the Flash Magic application as needed on your PC Set Interface to None ISP 24 2011 Jackson Labs Technologies Inc Jac ks ony FireFly 1A User Manual abs Figure 4 4 Flash Magic utility PRODUCTI ON USE ONL RECERCA Step 1 Communications LPC2138 Erase block O 0x000000 0Ox000FFF a Erase block 1 0x001000 0x001FFF COM Port COM 4 Y Erase block 2 0x002000 0x002FFF i Erase block 3 0x002000 0x003FFF Baud Rate 38400 7 Erase block 4 0x004000 0x004FFF Erase block 5 f0x005000 0x005FFF A Erase all Flash Code Rd Prot Oscillator MHz 4 Erase blocks used by Hex File Interface Step 3 Hex File Hex File FireFly IIA_2 19 hex Modified Unknown more info 4 Options 5 Fill unused Flash _ Gen block checksums Execute our Training or Consulting Partner Embedded Systems Academy www esacademy com B Press the Select Device button and the window shown in Figure 4 5 will appear 2011 Jackson Labs Technologies Inc 25 FireFly 1A User Manual Jackson Figure 4 5 Device selection window Flash Magic NON PRODUCTION US
18. alth of the unit s OCXO performance GGASTat shows height in MSL Meters this is different from traditional GPS receivers that display height in GPS Meters The difference between MSL and GPS height can be significant 35m or more are common 3 3 7 GPS GPRMC This command instructs the FireFly 1A to send the NMEA standard string GPRMC every N seconds with N in the interval 0 255 The command is disabled during the initial 4 minute OCXO warmup phase This command has the following format GPS GPRMC lt int gt 0 255 3 3 8 GPS XYZSPeed Firmware version 0 909 and later add a 3D velocity vector output command Enabling this command will output a 3 dimensional velocity vector indicating the unit s speed in centimeters per second as well as the Time Of Week in milliseconds X Y and Z speed are individually given and are independent of each other An accuracy estimate in centimeters per second is also given The velocity data is time stamped using the time of week with O 2011 Jackson Labs Technologies Inc 9 FireFly 1A User Manual Jackson Labs a resolution of milliseconds Use the following format to generate the velocity vector every N seconds with N in the interval 0 255 GPS XYZSPeed lt int gt 0 255 3 3 9 GPS POSition This command will return the position and height of the GPS antenna including velocity and track over ground 3 3 10 GPS RESET ONCE This command will re initialize the GPS receiver 3 3 11
19. d Verify that the firmware version is the version that was downloaded O 2011 Jackson Labs Technologies Inc 27 FireFly 1A User Manual 28 Jackson ii 2011 Jackson Labs Technologies Inc Jackson FireFly 1A User Manual Labs GPSCon Utility 5 1 Description GPSCon is a program for the monitoring and control of a variety of GPS time and frequency standard receivers It communicates with the receiver using the SCPI command set This utility can be obtained directly from Real Ham Radio com at the following URL http www realhamradio com gpscon buy now htm Important note On newer faster computers running Windows 7 GPSCon may not acquire data correctly If you encounter this problem it is recommended that you install GPSCon on a slower computer using Windows XP 5 2 Installation Follow the directions that come with GPSCon for installing the utility on your computer 5 3 Using GPSCon The GPSCon utility has a help file that should be consulted in order to get the full functionality of this utility Only a few of the features and commands are mentioned in this appendix for convenience 5 3 1 Setting the options To set up the options for your GPSCon session press the Options button below the display area The window shown in Figure 5 1 will appear You can select from the tabs which options you wish to set O 2011 Jackson Labs Technologies Inc 29 FireFly 1A User Manual Figure 5 1 Ni GPSCon Utilit
20. enables disables echo on RS 232 This command has the following format SYSTem COMMunicate SERial ECHO lt ON OFF gt 3 8 1 2 SYSTem COMMunicate SERial PROmpt This command enables disables the prompt scpi gt on the SCPI command lines The prompt must be enabled when used with the software GPSCon This command has the following format SYSTem COMMunicate SERial PROmpt lt ON OFF gt 3 8 1 3 SYSTem COMMunicate SERial BAUD This command sets the RS 232 serial speed The serial configuration is always 8 bit 1 stop bit no parity no HW flow control Upon Factory reset the speed is set at 115200 bauds This command has the following format SYSTem COMMunicate SERial BAUD lt 9600 19200 38400 57600 115200 gt 2011 Jackson Labs Technologies Inc 15 FireFly 1A User Manual Jackson Labs 3 8 2 SYSTem STATus This query returns a full page of GPS status in ASCII format The output is compatible with GPSCon 3 8 3 SYSTem FACToryReset ONCE This command applies the Factory Reset setting to the EEPROM All aging tempco and user parameters are overwritten with factory default values 3 9 SERVO Subsystem This subsystem regroups all the commands related to the adjustment of the servo loop SERVo COARSeDac lt int gt 0 225 SERVo DACGain lt int gt 0 1 10000 SERVo EFCScale lt float gt 0 0 500 0 SERVo EFCDamping lt float gt 0 0 4000 0 SERVo SLOPe lt NEG POS gt SERVo TEMPCOmpensation lt float
21. er RF Input Shield GND connector J2 ISP Status Alarm Lock Status Pin 3 3 3V CMOS output 3 LOCK OK indicator can drive an indicators and Pin 2 4 7Kohm pull up on open LED Enable ISP Flash collector to 3 3V 2 ALARM unlock indicator needs Download Mode buffering 1 GND Connect pin 2 to ground during power on to enter ISP flash firmware download mode 2 2 Coaxial Connector types There are three coaxial connectors on the FireFly 1A board They are the following types J1 antenna MMCX J3 1PPS output SMB J4 10MHZz sine output SMB 2 3 Connecting the GPS Antenna Connect the GPS antenna to the BNC to MMCX cable adapter Caution use a Lightning Arrestor on your Antenna setup Use an amplified GPS antenna that is 3V LNA compatible The FireFly 1A GPS receiver is a 50 channel high sensitivity GPS receiver with very fast lock time It does not require any self survey or position hold mode auto survey and thus can be used in mobile platforms FireFly 1A is capable of generating standard navigation messages see GPS GPGGA and GPS GPRMC RS 232 commands that are compatible with most GPS based navigation software Please note that FireFly 1A indicates MSL height rather than GPS height in its GPGGA GPS and syst stat output strings The GPS receiver generates a 1PPS time signal that is phase synchronized to UTC This 1PPS signal is used to frequency lock the 1OMHz Sine Wave output of the FireFly 1A GPSDO to UTC thus disciplini
22. fect 2 Dees Use DTAVATS re D emo rit Boot Louder STAL Fseg tH 10000 Boot Loader I0 Sabin Please note that the Use Baud Rate setting needs to be set to 38400 Baud or less it will not work faster than 38400 Baud The DEVICE should show up as LPC2138 after pressing READ DEVICE ID 2011 Jackson Labs Technologies Inc 23 FireFly 1A User Manual Jackson abs Also please point the Filename to the directory where you have stored the latest firmware hex file that is to be downloaded D Start the download by pressing Upload to Flash button The window in Figure 4 3 should appear if the correct COM port has been chosen etc Figure 4 3 LPC2000 flash download LEA Minah Lihis ie Buses LPC2000 Flash Utility V2 2 3 Flach Fiori Ennii Blane Cuman akon Connecter Ta P CAPM Fup GPS DO App sonne Blak Check FF Ene Dee rot Decin Becton Unload ta Flash Sint Sector O IPN z r Dapa fih em End aca Firmada fonc 2 Ciara Use DIFUATS Bence LCD pci Pan i CRT MEAL Freq ted fing Bevin ID at Ladies ID ras LAS Flat ley Beet hia LE EL Please reset your UPC2000 board mow and them press OF DE Press the OK button and the download should start Sometimes the utility gets confused and this process from item 4 4 B has to be tried several times It is not necessary to press reset as the utility is asking Just press
23. gt 4000 0 4000 0 SERVo AGINGcompensation lt float gt 10 0 10 0 SERVo PHASECOrrection lt float gt 100 0 100 0 SERVo 1PPSoffset lt int gt ns SERVo QUIet lt ON OFF gt SERVo TRACe lt int gt 0 255 SERVo 3 9 1 SERVo COARSeDac This command sets the coarse Dac that controls the EFC The FireFly 1A control loop automatically adjusts this setting The user should not have to change this value This command has the following format SERVo COARSeDac lt int gt 0 225 3 9 2 SERVo DACGain This command is used for factory setup 3 9 3 SERVo EFCScale Controls the Proportional part of the PID loop Typical values are 0 7 double oven OCXO to 6 0 simple single oven OCXO Larger values increase the loop control at the expense of increased noise while locked Setting this value too high can cause loop instabilities 16 2011 Jackson Labs Technologies Inc Jackson FireFly 1A User Manual Labs This command has the following format SERVo EFCScale lt float gt 0 0 500 0 3 9 4 SERVo EFCDamping Sets the Low Pass filter effectiveness of the DAC Values from 2 0 to 50 are typically used Larger values result in less noise at the expense of phase delay This command has the following format SERVo EFCDamping lt float gt 0 0 4000 0 3 9 5 SERVo SLOPe The parameter determines the sign of the slope between the EFC and the frequency variation of the OCXO This parameter should be set to match your OCXO s
24. gt 0 255 GPS GPRMC lt int gt 0 255 GPS XYZSPeed lt int gt 0 255 GPS POSition GPS RESET ONCE GPS 3 3 1 GPS SATellite This group of commands describe the satellite constellation 3 3 2 GPS SATellite TRAcking COUNt This query returns the number of satellites being tracked 3 3 3 GPS SATellite ViSible COUNt This query returns the number of satellites PRN that the almanac predicts should be visible given date time and position 3 3 4 NMEA Support The following two commands allow the FireFly 1A GPSDO to be used as an industry standard navigation GPS receiver The GPGGA and GPRMC NMEA commands comprise all necessary information about the antenna position height velocity direction satellite info fix info time date and other information that can be used by standard navigation applications via the FireFly 1A RS 232 interface Once enabled FireFly 1A will send out information on the RS 232 transmit pin automatically every N seconds All incoming RS 232 commands are still recognized by FireFly 1A since the RS 232 interface transmit and receive lines are completely independent of one another Please note that the position direction and speed data is delayed by one second from when the GPS receiver internally reported these to the FireFly 1A Microprocessor so the position is valid for the 1PPS pulse previous to the last 1PPS pulse at the time the data is sent one second delay The time and date are properly outp
25. he options window can be selected and you can set whatever options you need such as paths for logging or exporting graphics 5 3 2 Sending manual commands to the receiver You can send SCPI commands manually by using the drop down box under the display window as shown in Figure 5 4 Care must be taken when sending these commands so be sure that the command that you select is supported by the FireFly 1A GPSDO Once you ve selected the command you can press Send to send it to the FireFly 1A 32 2011 Jackson Labs Technologies Inc J ack 5 ies FireFly 1A User Manual abs ae 5 4 Sending manual commands QUISITIOH ree racking Y Hot Tracking EN RH El az PAH El az 17 59 15 2447 a 72 18 73m 15 in 26 18 Ji 176 3 256 54 209 dd J32 68 268 10 286 UTE 22 60 62 28 Oct 2010 LAT H 37 16 52 797 Lon W 120259275 645 HTEHHA DELAY 30 ns HET 74 10 m CPL ajay oe teens ne A ea antes a care CXD Current Gh EFG OK PS Aecelver Status 30 Fix PPS SOURCE MOGE GPS 1PFS SOURCE STATE GPS PS Status Locked ed EE ET 22 33 20 28 10 10 UTC Alecereer irasu gt Log Dial eo 123929 235000 UTC Pecera imacu F Log Olik E 2202939 28 10410 UTC Receren iraul a plan FOSC EFC AOL F Titol Cua TEMP Def TEST RES F boot ar TEST a GPS MIT CATE promo dol D Cond SEE IT POS BEG IW deg rain sp ere 224217 26 10 00 UTE Fieceren birrul 5 3 3 Use of the mouse in graph mode Refer to Figure 5 5 for the f
26. hnologies Inc Jackson FireFly 1A User Manual Labs Firmware Upgrade Instructions 4 1 Introduction The following is a short tutorial on how to upgrade the FireFly 1A GPSDO firmware Please follow the instructions in order to prevent corrupting the FireFly 1A Flash which may require reflashing at the factory With some practice the entire Flash upgrade can be done in less than one minute even though the following seems like a fairly long list of instructions 4 2 ISP Flash Loader Utility installation There are two Flash loader utilities available to upgrade the FireFly 1A firmware You can download the Philips LPC2000 utility from the Jackson Labs Technologies Inc website under the Support tab http www jackson labs com support html The Flash Magic utility is available for download on the Flash Magic website http www flashmagictool com 4 2 1 Philips LPC2000 Flash Utility The first is the Philips LPC2000 utility version 2 2 3 Please note that some computers are known to be incompatible with the LPC2000 flash utility Preliminary investigations show Windows Media Center and or Centrino vPro processor systems to create download difficulties Please use a different computer if you experience problems such as the download breaking up in the middle of the transfer Or alternatively you may use the Flash Magic programming tool Please ensure that you have at least version 2 2 3 of the LPC2100 flash utility installed Ea
27. ical life saving or life sustaining applications 6 1 3 Exclusive Remedies THE REMEDIES PROVIDED HEREIN ARE THE CUSTOMER S SOLE AND EXCLUSIVE REMEDIES JACKSON LABS TECHNOLOGIES INC SHALL NOT BE LIABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES WHETHER BASED ON CONTRACT TORT OR ANY OTHER LEGAL THEORY 38 O 2011 Jackson Labs Technologies Inc
28. ng the unit s 10MHZ frequency output to the US Naval master clock for very high frequency accuracy typically better than 1ppb of frequency accuracy when locked to GPS Over the long term the FireFly 1A will out perform free running Cesium Atomic Frequency Standards 4 2011 Jackson Labs Technologies Inc Jackson FireFly 1A User Manual Labs 2 4 Remote serial control e The unit is controlled via the Serial port at 115200 baud 8N1 Other Baud Rates can be set via SCPI commands e Connect the RX TX and GND pins of connector J6 to a standard RS 232 connector attaching the FireFly 1A unit to your PC s Hyperterminal or the optional GPSCon software package An RS 232 level shifter is built into the FireFly 1A PCB A free control graphing program for Windows called Z38XX is available on the Jackson Labs Technologies Inc website under the support tab 2 4 1 Help and command overview e A listing of the available RS 232 commands can be shown by typing help e IDN can be used to see if the connection works Both commands need to be followed by pressing Enter 2 4 2 Loop parameter adjustment e All loop parameters can be controlled via the RS 232 serial port e Loop parameters are optimized for the OCXO on the board and changing the factory settings may result in the unit s performance to deteriorate The commands to control the loop parameters are part of the servo command See also the SERVO Subsy
29. ollowing description In graph mode the span of the graph may be set using the span setting Alternatively the start and or stop time of the graph may be locked using the mouse Set the start time by left clicking on the desired start point If you wish the stop time may also be locked by right clicking the desired stop point This can all be unlocked by left double clicking anywhere on the graph Double click always causes all of the selected span data to be displayed At the next update cycle the selected span if not set to zero will be enforced However the left click and if chosen the right click always overrides the span setting To display all of the data in the file without manually setting the span to zero you should right double click in the graph This has the effect of setting the start time to zero the stop time to infinity and asserting the mouse override condition To release left double click Since this is harder to describe than to actually do here is a paraphrase of the above To zoom in The mouse is used to set the left extent and the right extent of the portion of the curve that the user wants to fill the screen Click once with the left mouse button on the point that marks the left side of what you want to be the magnified curve Immediately that point becomes the left end of the curve Then similarly click the right mouse button on the curve at the time you wish to be the right most portion of the magnified curve and i
30. rlier versions may not recognize the LPC2138 processor used on the FireFly 1A boards 4 2 2 Flash Magic Flash Programming Utility The second utility is the Flash Magic tool available on the Flash Magic website 2011 Jackson Labs Technologies Inc 21 FireFly 1A User Manual Jackson abs http www flashmagictool com If the Philips LPC2000 tool doesn t work please use this one 4 3 Putting the PCB into In Circuit Programming ISP mode Momentarily short out pins 1 and 2 of header J2 using a jumper or other conductive material during power on Both LED s should remain off indicating the unit is properly placed into ISP mode If the LED s light up after power on the unit is not in ISP mode Figure 4 1 Location of J2 SHORT OUT PINS AND 2 OF HEADER PRIOR TO POWER ON 4 4 Downloading the firmware Download the latest version of FireFly 1A firmware from the Jackson Labs Technologies Inc support website and store it in a place that will be remembered The file is in hex format The unit needs to be connected to the computer s RS 232 serial port prior to firmware download Connect a DB 9 serial connector to the FireFly 1A as indicated in Section 2 1 1 4 4 1 Philips LPC2000 Flash Utility A Open the LPC2000 utility Set the COM port in the LPC2000 application as needed on your PC 22 2011 Jackson Labs Technologies Inc Jackson FireFly 1A User Manual abs B Select the Baud Rate of the LPC2000 utility
31. s tables for the ac mains voltage requirements and ambient operating temperature range 2011 Jackson Labs Technologies Inc 1 FireFly 1A User Manual Jackson abs 2 2011 Jackson Labs Technologies Inc Jackson FireFly 1A User Manual abs Quick Start Instructions 2 1 Powering Up the Unit The unit is powered from a 8V 14V DC source The current is typically less than 0 15A at 12V Connect a clean 12V power supply to J5 The connector style is a MolexPart Number 22 23 2031 connector Warning Do not reverse the polarity of the power connector this will damage the unit 2 1 1 Major connections The major connections and features of the FireFly 1A PCB are shown in Figure 2 1 Figure 2 1 Major connections to FireFly 1A a RS 232RX fr ed le A o ia E RS 232 TX S 2011 Jackson Labs Technologies Inc 3 FireFly 1A User Manual Table 2 1 shows the FireFly 1A revision 2 0 hardware connectors Table 2 1 FireFly 1A hardware connectors Jackson Ref Name Function Specification Pinning J5 12V Clean 12V Supply 8 0V 14 0V DC lt 0 5A lt 10mVac 3 12V 2 GND 1 GND J4 Sine Out 10MHz Output 11dBm 3dB 10MHz Output Center Sine Output Shield GND J3 1PPS Out 1PPS Output 3 3V CMOS Rising Edge Center 1PPS Output Shield GND Synchronized J6 RS 232 RS 232 115Kbaud 8N1 RS 232 3 RX 2 GND 1 TX Communication Ji Antenna GPS Antenna 3 0V Amplified Antenna MMCX Cent
32. stem section below The individual commands are EFC Scale this is the proportional gain of the PID loop Higher values will give quicker convergence and faster locking of the GPS time lower loop time constant lower values give less noise Values between 0 7 and 6 0 are typical EFC Damping overall IIR filter time constant Higher values increase loop time constant Jackson Labs Technologies Inc typically uses values between 10 to 50 Setting this value too high may cause loop instability Phase compensation this is the Integral part of the PID loop This corrects phase offsets between the FireFly 1A 1PPS signal and the UTC 1PPS signal as generated by the GPS receiver Set higher values for tighter phase following at the expense of frequency stability Typical values range from 4 30 25 being the default Setting this value too high may cause loop instability A well compensated unit will show performance similar to the plot in Figure 2 2 when experiencing small perturbations 2011 Jackson Labs Technologies Inc 5 FireFly 1A User Manual Jacksol Figure 2 2 FireFly 1A phase compensation plot 6 O 2011 Jackson Labs Technologies Inc Jackson FireFly 1A User Manual Labs SCPI Control Quick Start Instructions 3 1 Introduction The SCPI Standard Commands for Programmable Instrumentation subsystem is accessed via the RS 232 interface and a terminal program By default the terminal settings are 115200 8N 1
33. t immediately becomes the end point on the right side And finally to return to the zoomed out fit to window view left double click on the curve 2011 Jackson Labs Technologies Inc 33 FireFly 1A User Manual Jackson Remember in order to see all the data in the log file you must either set the span control to zero or right double click in the graph When you have locked the start and stop time using the mouse you can scroll left or right through the data without changing the span To scroll to a later time use Shift Left click To scroll to an earlier time use Shift Right click Double left click to release everything The time span indication at the lower right of the graph will turn red to signify that mouse override is in effect Figure 5 5 Graph display GPoilon Utility Fro Gr Loan LIMA AZ 55 Hate Labs FiseFiyll Fanwara Flew 2 15 d 266 30 341338 0 1 0 ra Tra O ee tir AE AAA im Cie OF Bow DELE EAT REAL Eon A D EE TTD ba o Far teapa OFA UTC 20008 ce A Send Fos Log State FF Log sat coun D Teandiain lime codes Legere ai Op ens timers DEC aa Fool fT cro Continue wad ove came ah LED Eede ren Late CS 4 SET RITE DORIS 4 072305 0 00530373 E 34 O 2011 Jackson Labs Technologies Inc J ac k 5 ony FireFly 1A User Manual JLabs Figure 5 6 Expanded Graph Display GPa Com Wilby Pra GPECon COME il SS son Labs FoeFipdl Farevers
34. time units are seconds The first number in the response is the holdover duration The duration units are seconds and the resolution 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 3 5 3 SYNChronization HOLDover INITiate The command will place the unit into a forced holdover state while still indicating the difference between the internal 1PPS generated by the OCXO and the GPS generated 1PPS This command is useful to measure the OCXO drift when in holdover Please note that the Time Interval Counter is limited to 2000ns display range The time interval difference may be displayed with the SYNC command 3 5 4 SYNChronization HOLDover RECovery INITiate This command terminates a manual holdover that was initiated with the SYNC HOLD INIT command and return the unit to normal GPS locking mode 3 5 5 SYNChronization TINTerval This query returns the difference or timing shift between the FireFly 1A 1 PPS and the GPS 1 PPS signals The resolution is 1E 10 seconds 3 5 6 SYNChronization IMMEdiate This command initiates a near instantaneous alignment of the GPS 1 PPS and Receiver output 1 PPS To be effective this command has to be issued
35. to be 38400 or slower Faster Baud rates will not work properly C Press the READ DEVICE ID button this should then show LPC2138 in the DEVICE window if the unit is communicating correctly to the application Warning Make sure NOT to press the erase button under any circumstances this may erase factory calibration data and the unit will not operate and will have to be returned to the factory Pressing the erase button on the ISP utility will thus void the warranty A Open the LPC2000 utility Set the COM port in the LPC2000 application as needed on your PC B Select the Baud Rate of the LPC2000 utility to be 38400 or slower Faster Baud rates will not work properly C Press the READ DEVICE ID button this should then show LPC2136 in the DEVICE window if the unit is communicating correctly to the application Warning Make sure NOT to press the erase button under any circumstances this may erase factory calibration data and the unit will not operate and will have to be returned to the factory Pressing the erase button on the ISP utility will thus void the warranty Figure 4 2 LPC2000 flash utility UPEAT Flash Utility PHILIPS LPC2000 Flash Utility V2 2 3 Flash Programa Erase Y Diank Ferara EMSAM F uy GPSO DiAopicationunainF ur se lank Check Enie Dees 0 Selected Sector rw E Stat Sector Upload to Flash r Eras Cimpara Flesh li End Sector Tien
36. um drift is 77ns to 93ns The average is TI av 0 03ns The standard deviation over the 200 hour plot is sd 11ns This means the average error of the 10MHZ phase of this unit over 200 hours is only 11ns rms Or in other words the average jitter wander over 200 hours of operation is 11ns 200Hrs 1 528E 014 or in other words the unit performs as well as a high quality Cesium Atomic reference clock over long periods of time The unit disciplines its internal 10MHz reference to within less than 80ns peak to peak of UTC at all times which is less than one complete clock cycle at 10MHz 36 2011 Jackson Labs Technologies Inc Jackson FireFly 1A User Manual Labs Certification and Warranty 6 1 Certification Jackson Labs Technologies Inc certifies that this product met its published specifications at time of shipment 6 1 1 Warranty This Jackson Labs Technologies Inc hardware product is warranted against defects in material and workmanship for a period of 1 one year from date of delivery During the warranty period Jackson Labs Technologies Inc will at its discretion either repair or replace products that prove to be defective Jackson Labs Technologies Inc does not warrant that the operation for the software firmware or hardware shall be uninterrupted or error free even if the product is operated within its specifications For warranty service this product must be returned to Jackson Labs Technologies
37. ut with correct UTC synchronization to the 1PPS pulse immediately prior to the data being sent 8 O 2011 Jackson Labs Technologies Inc Jackson FireFly 1A User Manual Labs Once set the following two commands will be stored in NV memory and generate output information even after power to the unit has been cycled 3 3 5 GPS GPGGA This command instructs the FireFly 1A to send the NMEA standard string GPGGA every N seconds with N in the interval 0 255 The command is disabled during the initial 4 minute OCXO warmup phase This command has the following format GPS GPGGA lt int gt 0 255 GPGGA shows height in MSL Meters this is different from traditional GPS receivers that display height in GPS Meters The difference between MSL and GPS height can be significant 35m or more are common 3 3 6 GPS GGASTat This command instructs the FireFly 1A to send a modified version of the NMEA standard string GPGGA every N seconds with N in the interval 0 255 The command is disabled during the initial 7 minute OCXO warmup phase This command has the following format GPS GGASTat lt int gt 0 255 This command replaces the regular NMEA GGA validity flag with a decimal number indicating the lock state of the unit Please see section SERVo TRACe for a detailed description of the lock state variable The command allows capture of the position and other information available in the GGA command as well as tracking the lock state and he
38. while not in holdover 3 5 7 SYNChronization FEEstimate This query returns the Frequency Error Estimate similar to the Allan Variance using a 1000s measurement interval and comparing the internal 1PPS to GPS 1PPS offset Values less than 1E 012 are below the noise floor and are not significant 12 2011 Jackson Labs Technologies Inc Jackson i FireFly 1A User Manual Labs 3 5 8 SYNChronization LOCKed This query returns the lock state 0 0FF 1 ON of the PLL controlling the OCXO 3 5 9 SYNChronization health The SYNChronization health query returns a hexadecimal number indicating the system s health status Error flags are encoded in a binary fashion so that each flag occupies one single bit of the binary equivalent of the hexadecimal health status flag The following system parameters are monitored and indicated through the health status indicator Individual parameters are ored together which results in a single hexadecimal value encoding the following system status information If the OCXO coarse DAC is maxed out at 255 HEALTH STATUS l 0x1 If the OCXO coarse DAC is mined out at 0 HEALTH STATUS l 0x2 If the phase offset to UTC is gt 250ns HEALTH STATUS 0x4 If the run time is lt 300 seconds HEALTH STATUS l 0x8 If the GPS is in holdover gt 60s HEALTH STATUS l 0x10 If the Frequency Estimate is out of bounds HEALTH STATUS l 0x20 If the OCXO voltage is too high HEALTH STATUS l 0x40 If the OCXO
39. y Pro GSC on COM ees ace el Expat _Heb seca Options window Mec D trimite F El interval fe Haa I Local HTML arde tea fe program fea EE opacar grat Fam Browse Bit heen display bran HTML fe Pasta 317 HTML usdata riera 30 sec Cotelas tracking history tie Track ide E program files AiG ignacon gradmp bin Some Max kB 8 urita 51 Span 2030 5 3 1 1 Communication Parameters Before you can use GPSCon you must set the communication parameters for your system Open the dialog box by pressing the Options button Then select the Coms tab You will see the window shown in Figure 5 2 Select the correct COM port for your computer and set the baud rate to 115200 parity to None Data Bits to 8 and Stop Bits to 1 Set Flow Control to None Once you have configured the communication parameters press the OK button to close the window 5 3 1 2 Auxiliary parameters After pressing the Options button you can select Auxiliary and set other options or measurements See Figure 5 3 for an example of an auxiliary measurement You will notice that the Aux 1 request string has been set to meas current lt CD gt and the Log Aux1 box is checked In the area below labeled Traces to be visible on the graph the box Aux 1 is checked and the label OCXO curr has been added 30 FF Leg Sima F Log EFC FF
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