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Measuresoft Development Ltd. SNET to USB Interface 35954U User

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1. System zero error The IMP is unable to perform a drift correction System calibration corrupt The calibration constants Including backup values held in the non volatile memory show read errors Non volatile memory is either corrupted or not fitted Strain gauge not initialised The IMP database must be loaded with the gauge offset resistance and factor See the Command Directory entry for IN Relevant only to IMP type 3595 1B Digital result pending Relevant only to IMP types 3595 1H and 1J Period time out The IMP has tried to measure a time period but took longer than the maximum time allowed as set by the CH TI command Not measured The channel has been set to skip digital output or event capture The remainder of possible error codes are unassigned Page 94 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 3 Appendix Upgrading Interface Firmware The 35954U Interface allows the user to upgrade the Interface firmware If your Interface requires an upgrade please follow the steps below 1 Disconnect the Interface 2 Remove and retain the 4 screws on the front panel of the unit and slide off the top cover 3 Place a Jumper on the program link highlighted in red below Fig 1 1 and Fig 1 2 3 1 1 Fig 1 1 Location of progr
2. open circuit o p output info information Page 30 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 2 1 2 2 Table 2 2 Additional commands for the 3595 1H and 1J IMP Command Purpose CHLR Returns the loop resistance of a thermocouple CH UC Converts a measured parameter into alternative units With the function y mx c UT Defines a set of coefficients to be used for thermocouple linearisation These are applied by selecting the appropriate channel mode CH PL Enables a measured parameter to be linearised into alternative units PL Defines coefficients of the polynomial applied by CH PL CH HL Defines a high limit for channel alarm checking CH LL Defines a low limit for channel alarm checking CH GO Defines a group of alarm channels to be used with a digital output channel AS Enables an IMP to start automatically after a hard reset RM Selects the result mode from real time time tagged historical Page 31 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 2 1 3 COMMAND DIRECTORY In this directory the IMP commands are classified under the following headings Commands fo
3. Same modes as for 2A 800 Switch output off high For digital output set channel to logic 1 or 0 801 Switch output on low Similar to modes as for 2A except 810 Alarm op high a Status of channel can be read back 820 Alarm op low b Outputs default to Off on power up 830 Hw watch 840 Sw watch 850 Hw amp Sw 900 Gate time 10ms Frequency Measurement 901 Gate time 100ms 902 Gate time 1s 903 Gate time 10s 910 1 period Multiple period measurement 911 10 periods Returns the time for one period in seconds 912 100 periods Same modes as for 2A 913 1000 periods Page 39 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual For status measurements in channels 1 through 18 the logic levels applicable are Mode 700 TTL m lt 0 8V 0 m gt 2 4V 1 Mode 701 3V 9V m lt 3V 0 m gt QV 1 Mode 702 25kQ m lt 1000 0 M gt 1kQ 1 In each of the above modes the last value measured is maintained during the intermediate region for example in Mode 700 where 0 8V lt m lt 2 4V For frequency and period measurements on channels 19 and 20 modes 900 903 and 910 913 the following conditions apply e For continuous scans a 3595 1H and 1J type IMP does not wait for a measurement to complete but returns the e
4. low zero impedance When the IMP is powered off the switch is high impedance and is read as a 1 by another IMP The digital channel output maintains this state until changed by a set up command Page 71 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 2 1 10 2 CH LR CHannel Loop Resistance Where nis an integer that defines the channel number in the range 1 lt n lt 18 Function Reports the loop resistance between high and low of a thermocouple on channel n Channel n must be configured as a thermocouple type MOde 310 3A4 If nis out of range the command does not return an error and is ignored Response In Stream 3 CHnLR lt 4 byte result gt The result is in kohms no time lag 2 1 10 3 CH UC CHannel Unit Conversion i Where nis an integer that defines the channel number in the range 1 lt n lt 18 mis an IEEE 754 floating point number defining the slop of a line cis an IEEE 754 floating point number defining a constant y axis catersian intersection eis an enable flag 1 enable 0 disable Function Used to convert a measured parameter into alternative units with the function y mx c Where x is the input parameter and y is the output Notes 1 The input parameter is post Channel Mode Therefore if the required output
5. yosoinsesuw Measuresoft Development Ltd SNET to USB Interface 35954U User Manual Version 1 0 0 0 prepared for measuresoft by Ryan Craven Thursday December 22 2011 measuresoft development This document is the copyright of Measuresoft and may not be modified copied or distributed in any form whatsoever without the prior permission of Measuresoft Page 1 of 98 measuresoft development limited partnership courtyard the ramparts dundalk ireland tel 353 42 933 2399 fax 353 42 932 7187 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual Technical Specifications 3595 4U IMP Interface Inputs Power requirement 24 48Vdc External Power Supply Power connection Panel mounted 9 pin D sub plug Outputs Output SNET IMP power supply serial communication network Output connection Panel mounted 9 pin D sub socket Panel mounted USB B connection Network Cable Details Cable Spec Screened single pair cable 100Ohm impedance 12 24AWG depending on network length number of IMPs Maximum No IMPs 50 Operating Conditions Temperature range 20 to 50C Relative humidity 0 to 40C lt 90 Mechanical Casing Aluminium sealed to IP55 Size w x d x h 170 x 116 x 36mm Weight 2kg Accessories USB Cable SNET ne
6. 2 1 10 11 Where Function 2 1 10 12 Function SNET to USB Interface 35954U User Manual RM Result Mode fie acs ae eal time mode default eal time mode with time tagging See page 1 45 Il results returned in Stream 2 historical 3355 Wow i N gt O Wow ou gt DD Mode 0 outputs data on Stream 0 in the same format as for all IMP devices Mode 1 outputs the same data but with a time tag Mode 2 outputs historical data on Stream 2 and allows all 960 buffers to be used Each buffer holds a scan of 20 channels If for example the scan period is set to 10s with the SP command the 960 buffers will be filled in 9 600 seconds 2hrs 40mins Historical mode buffering operates on a first in first out basis FIFO If the IMP is measuring faster than the PC can read results the results are stacked in the FIFO buffer queue When the buffer is full the IMP continues measuring so that it can monitor alarm inputs but does not store new results in the buffer until soace becomes available FB Flush Buffers Flushes the historical results FIFO buffer and returns the FIFO buffer to the free buffer list FB is a one shot command and has no persistent effect For further flushing another FB command must be sent Page 78 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 2 1 10 13
7. Version 1 0 0 0 SNET to USB Interface 35954U User Manual 1 4 5 MESSAGES Messages may be generated either as a result of errors at the IMP or the interface or in response toa valid command These messages are presented on the current port either USB serial or both The full complement of messages is contained in Tables 1 2 and 1 3 For more information on the result and error formats refer to Part 2 of the manual 1 4 5 1 Table 1 2 Responses to Valid Commands Displayed Message prks Comments Number Descriptive String S00 DD MM YY HH MM SS Returned in response to _ TI command TH S01 Status XY Returned in response to _IN command X status Y issue 1 4 5 2 Table 1 3 Error Messages Displayed Message Number Descriptive String comments S50 XX IMP command string fails to arrive at IMP XX S51 XXY Requested data from stream Y of IMP XX is either corrupted during reception or nothing is received at all S54 S Net command too long A single S Net command has been issued that contains more than 256 characters after any numbers contained in the command have been converted S62 Command string too long This error is received when a command string of more than 256 characters is sent to the interface When this happens the interface discards the entire command string S70 Invalid number Some S Net commands require the parameter values to be in IEEE format Error S70 means that the IEEE format has not been used S7
8. for test purposes e All analogue input channels are set to volts DC auto ranging e All digital channels are set to digital status e The IMP is armed When all channels are set up in this way unused channels should be shorted out at t he connector block Response None Page 46 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 2 1 4 11 Where Note Function Note SNET to USB Interface 35954U User Manual SP Scan Period pis a 4 byte floating point number that defines the scan period in the range Oms through 16777215ms This command does not apply to type 1D IMP devices The SP command defines the period between start points of successive scans in the continuous measurement mode and this allows scan data to be sent to the PC ata defined rate Defined scan periods are intended for an IMP in the fast scanning mode See entry for the FR command For example a 3595 1A IMP could be set to make a fast scan of 20 thermocouples every second the duration of each scan being 300ms FR2 Actual scan time e g 300ms eil ool E a Time pon Period e g 1s gt Trigger Figure 2 1 Scan Period Command Defining the scan period gives two advantages a it provides a manageable amount of useful data for the PC and b the data becomes available at predictable intervals thus
9. lt t lt 80 C 177 F This command applies only to IMP types 1A 1C 1E 1H and 1J Sets the value of the external temperature reference into the IMP For use only when an external reference junction is to be used The units used for temperature results and references are set by the UN command None AM and UN 1 Historically called the cold junction Now known more accurately as the reference junction Similarly the hot junction is now known as the measurement junction Page 56 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 2 1 6 3 Where Note Function Response SNET to USB Interface 35954U User Manual TC set Thermocouple Checking for open circuit n 0 thermocouple checking off n 1 thermocouple checking on This command applies only to IMP types 1A 1C 1E 1H and 1J With checking enabled a second measurement follows the thermocouple measurement thi is to confirm thermocouple integrity Note that this may slow down the data acquisition rate to less than 1 per second When an open circuit is detected the measurement result is replaced with the error code See Chapter 2 None Page 57 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB I
10. the output is switched into the alarm state i e no change in this case thus disabling the machine Once the IMP has read the machine parameters and determined that none are in alarm it closes the output switch and thus enables the machine 2 1 10 10 AS Auto Start fae Where n 0 False do not auto start default n 1 True do auto start Function When auto start is set to true the IMP automatically begins operations after a hard reset power up or a hardware watchdog timeout After a hardware reset and just before entering an idle loop the IMP checks the value of nin its non volatile database If nis true the non volatile database is restored to the database proper as if the RD command had been issued A check is then made on the CONTINUOUS_SCANNING Boolean variable if this is true a scan is triggered automatically if it is false no further action is taken When auto start is set to false no action is taken Example A typical AS command sequence is 1 SE set up the IMP to default mode 2 CO set continuous triggering 3 AS1 set auto start to true 4 SD save settings in non volatile memory These commands prepare an IMP to respond to a hard reset by restoring its database and issuing a trigger command to itself Page 77 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0
11. 1 2 1 1 Table 1 1 S Net Connections Pin Function 1 2 amp 6 Screen 3 5 SNET 7 9 SNET 1 2 2 S NET TERMINATION The IMPs and S Net Interface within the 35954U Interface are high impedance devices whilst the S Net cable which interconnects them has a characteristic impedance of approximately 100Q Therefore to avoid signal reflections the S Net cable must be correctly terminated at both ends The way in which the S Net cable is terminated depends on where the 35954U Interface is placed in the S Net system An S Net terminator is fitted in the Interface A pair of terminators for use on the IMPs are supplied with the 35954U Interface Where the interface is placed at one end of the network Fig 1 2 the terminator in the IMP Interface must be connected A terminator should also be fitted to the IMP at the other end of the network Page 7 of 98 Working copy if printed P iIDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 1 2 2 1 Figure 1 1 The 35954U Interface placed at end of S Net IMP IMP IMP IMP 1 2 3 4 CONTROLLER IMP Interface Unit IN I 7 YJ i gt S Net To further IMPs if required S Net terminators should be fitted to the IMP Interface and to the IMP at the end of the S Net Where the Interface is placed in the network Fig 1 2 the terminator in the 35954U Interface should be discon
12. 1A 3595 1C Use AM or TE command to set the Use CH TI command to set time temperature reference for out period on each channel thermocouples next channel 2 1 11 3 STRAIN GAUGE SET UP This procedure must be used to enable strain gauge measurements Applies only to IMP type 3595 1B only Use CH GA command to set the gauge factor for each channel Use CH OF command to reload Use IN command to initialise initial strain gauge offset data strain gauge and store initial from the Host PC data to Host PC Figure 2 6 IMP Specific and Strain Gauge Set up Page 82 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 2 2 Chapter 2 Result and Error Formats 2 2 1 INTRODUCTION Table 3 1 summarises the result formats applicable to 3595 Series IMP types 1A 1B 1C 1D 1E 2A and 2B For IMP types 3595 1H and 1J the same formats apply However depending on the result mode selected the results may be time tagged The three result modes of IMP types 3595 1H and 1J are e Real time exactly the same format as for all other IMP types e Time tagged each scan data block or single measurement result has a bookmark and time tag appended e Historical allows the IMP to pass historical time tagged results back to the Host PC The formats of the b
13. 2 Chapter 3 Chapter 4 Introduces the various facilities of the 35954U Interface Relates to the installation of the 35954U Interface Explains how to e Connect the Interface to IMPs via S Net e S Net Termination e Connect up an external power supply e Connect to a PC Details the cabling and power supplies required for your particular system Describes the syntax function and response of each of the Interface commands The commands relate specifically to the 35954u Interface Part 2 of the manual contains details of the IMP commands and responses Chapter 1 Chapter 2 Describes the syntax function and response of each of the IMP commands Describes the format of the results and error messages received from the IMPs Page 5 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 1 1 3 DATA STREAMS To categorise data the S Net protocol operates four separate data types called streams Each stream uses a different data format This allows an application program to attach different priorities to data types and so to improve the speed with which high priority data such as event timing is handled The steams are arranged as follows Stream 0 Data in response to a command to measure all channels a scan or long numeric responses Stream 1 Data in response to a
14. CH1GAn1n2n3n4 IN1 ME1 for analogue IMP 1B only Where n1 n4 IEEE 754 floating point number n1 most significant byte For a strain gauge factor of say 2 25 First byte n1 01000000 equivalent to 6410 Second byte n2 00010000 equivalent to 1640 Third byte n3 00000000 equivalent to 0 Fourth byte n4 00000000 equivalent to 0 This command sequence e Resets previous settings e Sets channel 1 to measure strain using a 1 2 bridge 4mA configuration on auto ranging e Uses a strain gauge factor of 2 25 in strain calculations e Initializes the strain gauge and e Tells the IMP to take a measurement on Channel 1 A detailed explanation of how to convert the decimal number 2 25 into a binary number in IEEE 754 floating point format is given in Chapter 2 Page 28 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 2 1 1 5 INCORRECT COMMANDS The IMP checks command strings for correct syntax If it finds a command that it does not understand it ignores the command and moves on to the set of characters after the next semicolon or the next command string if the message ends before a semicolon occurs For example if the following command string is sent to an IMP HELLO TR The first five characters HELLO mean nothing to an IMP and it will
15. CHannel Time out Where Note Function Response 2 1 8 3 Where Note Function nis an integer that defines the channel number in the range 1 lt n lt 20 pis an integer that defines the time out code in the rangeO lt ps5 This command applies only to IMP types 1H 1J and 2A For a specific channel sets the time out period for period measurements The settings available are listed in Table 2 17 The default period is 2 seconds p 1 The time out period is the maximum time any period or one shot measurement is allowed to take If the period to be measured exceeds this time the error period time out is returned instead of a result For single period measurement of cyclic signals the time out period must be at least twice that of the measured signal This ensures both edges of the signal are within the time out period None Table 2 17 Time out periods Time out code Time out Period 0 200ms 2s 20s 50s 70s 130s Available on 1H and 1J IMP types only ahWN CL CLear event totalise counter nis an integer that defines the channel number in the range 1 lt n lt 20 This command applies only to the digital IMP type 2A and the Universal IMP types 1H and 1J Instructs the IMP to clear its event totalise counter and to inhibit counting until the next ME or TR command for a specified channel only The event totalise counter keeps a continuously updated reco
16. Interface connects to a PC via a USB B cable To install the Interface on your machine follow the steps below for the appropriate operating system 1 2 4 1 Windows XP If you are installing the Interface for operation on Windows XP you will need to download and install the appropriate virtual COM port drivers These drivers are available from www solartron imp com or from http www ftdichip com Drivers VCP htm When you have downloaded the drivers please follow the steps below 1 Ensure the 35954U Interface Unit is placed securely 2 Download the virtual COM port drivers save it where you can access it easily 3 Connect the Interface to your machine using a USB B cable 4 When prompted choose to install the drivers manually 5 Navigate to the folder you downloaded in Step 2 and click ok 6 The drivers for the Interface will now be installed 7 Once completed you should now see the Interface appear in your device manager under Ports 1 2 4 2 Windows Vista 1 Ensure the 35954U Interface Unit is placed securely 2 Connect the Interface to your machine using a USB B cable 3 Windows Vista should automatically detect and install the drivers for the Interface If not please download the driver from our site choose manual install navigate to the downloaded file and click ok 4 The drivers for the Interface will now be installed 5 Once completed you should now see the Interface appear in your device
17. Note Function Response Equipment Procedure nis an integer that defines the channel number in the range 1 lt ns4 X the measured current value corresponding to an non calibrated 0 004A output y the measured current value corresponding to an non calibrated 0 02A output Values x and y are both in amps in floating point format This command applies only to an IMP type 1D with a 3595 3Y connector block Allows current calibration of a specific output channel This should normally be left to users with specialist reference equipment Stream 3 4 characters Cnle where nis the channel number and e represents the calibration response as shown in Table 2 18 Same as for CH CV command The procedure for calibrating the output current of a type 1D IMP is 1 5 Same as for CH CV command 6 Using the CH VO command set the channel output current first to 0 004A and second to 0 02A and in each case measure the current actually output by the IMP 7 Using the measurements obtained in Step 6 send the channel calibrate current command CHnClxy In this command x is the actual current measured when 0 004A was requested and yis the actual voltage measured when 0 02A was requested 8 Check the calibration response in stream 3 see Table 2 18 to ensure that the IMP channel has been successfully calibrated Page 69 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User M
18. for totally fast IMP system Scans per second Integration Time 3595 1A 35951B 35951C 20ms FRO 1 56 2 01 1 48 16 67ms FR1 1 88 2 38 1 78 5 00ms FR2 5 41 5 85 4 48 4 17ms FR3 6 45 6 63 5 16 1 25ms FR4 12 95 11 33 9 10 1 04ms FR5 14 83 12 50 9 38 Table 2 14 Scan rate scan sec v no of fast five IMP system No of Fast No of Fast Combined Scan No of Slow Combined Scan Overall Scan IMPs FR2 IMPs FR4 Rate of Fast IMPs IMPs FRO Rate of Slow IMPs Rate 1 5 4 4 5 4 9 2 10 3 3 10 3 13 3 15 2 2 15 2 17 4 20 1 1 20 1 21 5 25 0 0 25 0 25 1 10 4 4 10 4 14 2 20 3 3 20 3 23 3 30 2 2 30 2 32 4 40 1 1 40 1 41 5 50 0 0 50 0 50 Page 54 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 2 1 5 4 Note Function Response See also 2 1 5 5 Note Function Response SNET to USB Interface 35954U User Manual KA calibration off at ee This command does not apply to the digital IMP types 2A and 2B With calibration on measurements are corrected with the offset and scale factors kept in EEPROM These factors are determined during factory calibration or changed by the calibrate command CA CH CV or CH Cl and suit the individual IMP This function defaults to on With calibration off the correction factors used assume perfect co
19. has recorded in that channel so far MEasure does not reset any counters Stream 1 one 4 byte result RM for the 1H and 1J IMP types Page 43 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 2 1 4 8 RE REset Function Sets all IMP settings to their default values this normally assumed on first power up COntinuous off Not armed Defined scan period set to Oms KAlibration on DRift correct on External temperature on AMbient temperature reference on All channels to skip Time out 2 seconds Temperatures returned in C Integration time set to 20ma FRO Voltage and current outputs set to default values see installation guide Sets scan to be sent over stream 0 Sets digital sample rate to default Event counters cleared User conversions cleared and disabled Both user thermocouples cleared Both user post linearisations cleared All channel alarm conditions cleared and disabled Response None Page 44 of 98 Working copy if printed P iIDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 2 1 4 9 Where Note Function Response SNET to USB Interface 35954U User Manual SA SAve set up ee eee
20. is pressure and the nout is measured from a 4 20mA transmitter two conversions are possible a Froma measured voltage across a precision resistor through which the current flows unit conversion is post CHannel MOde voltage b From a measured current through a 100Q precision resistor unit conversion is post CHannel MOde current 2 Once the measured parameter has been converted it is no longer available as current or voltage for example Page 72 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 2 1 10 4 SNET to USB Interface 35954U User Manual UT User Thermocouple linearisation Where Function Notes See also 2 1 10 5 lt gt defines the user thermocouple as Thermocouple 1 or 2 a5 agare IEEE 754 floating point numbers for the coefficients of a fifth order polynomial bs bo are IEEE 754 floating point numbers for the coefficients of a fifth order polynomial butare the inverse of the a5 a0 polynomial This command is used to apply a user defined linearisation to a thermocouple measurement The aim is to cover any thermocouple type not covered by the polynomials available in 3595 IMP types 1H and 1J Channel modes 390 394 use the coefficients defined by UT1 Modes 3A0 3A4 use coefficients defined by UT2 The computation of reference junction 4
21. manager under Ports Page 10 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 1 2 4 3 Windows 7 1 Ensure the 35954U Interface Unit is placed securely 2 Connect the Interface to your machine using a USB B cable 3 Windows 7 should automatically detect and install the drivers for the Interface If not please download the driver from our site choose manual install navigate to the downloaded file and click ok 4 The drivers for the Interface will now be installed 5 Once completed you should now see the Interface appear in your device manager under Ports Page 11 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 1 3 Chapter 3 Cabling and Power Supplies 1 3 1 S NET CABLE IMPs are linked to the 35954U Interface by S Net a serial communications network The S Net cable consists of a twisted par of multi stranded wires with a screen around them and has a nominal characteristic impedance of 100Q Unscreened cables may be used but in electrically hostile environments S Net signals may be subject to interference In most applications signals and IMP power a both delivered via the S Net cabl
22. period is less than the actual scan time the IMP outputs the scan data at the maximum uncontrolled rate Page 47 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual The defined scan period is not effective for single scans With the continuous mode inoperative scans start immediately on trigger To ensure long term repeatability of the defined scan period the analogue type IMP has its internal calendar clock synchronised to the time in the 4C Interface card Synchronisation occurs every second Due to the uncertainty of the clock in the PC 4C Interface card a small number of scans may be lost or gained over a 24 hour period This number is lt 2500 scan period where the scan period is in milliseconds Table 2 10 Average scan times for Fast Integration IMP devices Average Scan Time ms IMP type Measurement mode FR2 FR3 FR4 FRS5 3595 1A Voltage 189 159 81 71 3595 1B Voltage 176 155 95 84 3595 1C 1E Voltage 225 196 112 111 3595 1A Thermocouple 300 292 270 269 3595 1C 1E Thermocouple 337 328 311 309 3595 1A Thermocouple with OCTD 403 385 338 335 3595 1C 1E Thermocouple with OCTD 474 454 408 408 3595 1B Strain 360 328 238 8 221 3595 1B Resistance 284 254 168 151 3595 1B Temperature PRT 355 322 234 121 Notes on Autoscan Firmware 1 IMP types no
23. simplifying the reading of the data On power up the scan period is set to the default value of Oms which allows the IMP to output scan data at the fastest rate possible With this however the intervals at which data becomes available are unpredictable and if the PC is unable to cope with the large amount of data produced the system may hang To make scanned data more manageable and predictable the scan period defined by the SP command should also allow the PC enough time to process each block of scan data as it occurs For a guide the average scan times for the various types of IMP and their measurement modes are listed in Table 2 10 The scan period may be re defined at any time If a defined scan period is in operation the new period effectively merges with the old one See note on exception to this For example consider a scan with a defined period of 5 seconds that has been running for one second Commanding a new scan period of four seconds causes the next scan to start in three seconds Conversely if the new scan period is one second or less the next scan starts immediately on completion of the present scan Note that a scan is never terminated by re definition of the scan period When a new scan period is loaded with the LO command with continuous scanning the new period takes effect from the beginning of the next scan An IMP can not be made to output data faster than the inherent measurement rate If the defined scan
24. supply via the Interface is given below 1 3 3 1 1 3 3 1 CABLE SELECTION WHEN USING THE INTERFACE INTERNAL SUPPLY The internal power supply of the Interface can supply 43V to the S Net system For this Table 4 2 shows the recommended maximum cable length in metres for a given gage of cable and number of IMPs Page 13 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual Table 1 1 Maximum Cable Lengths for IMPs Using the Interface Internal Supply No of Maximum Cable Length Metres IMPS 12 AWG 16 AWG 20 AWG 24 AWG 3 4mm 1 3mm 0 5mm 0 2mm 1 1000 1000 1000 660 2 1000 1000 1000 660 3 1000 1000 1000 660 4 1000 1000 1000 534 5 1000 1000 1000 427 6 1000 1000 900 356 7 1000 1000 772 305 8 1000 1000 675 267 9 1000 1000 600 237 10 1000 1000 540 213 11 1000 1000 491 194 12 1000 1000 450 178 13 1000 1000 415 164 14 1000 1000 384 151 15 1000 923 352 139 16 1000 841 321 127 17 1000 758 290 114 18 1000 676 258 102 19 1000 594 227 89 20 1000 512 196 T7 21 933 430 164 65 22 755 348 133 52 23 577 266 101 40 24 400 184 70 27 25 222 102 39 15 1 3 3 2 1 3 3 2 CABLE SELECTION WHEN USING THE INTERFACE EXTERNAL SUPPLY When IMPs are powered from an external supply connecte
25. to ate with real time measurements as they are made Unwanted historical data may be flushed out Stream 0 is not used except in the special case of SA and Stream 1 is not used Stream 3 is retained it resides at the top of the data page Stream 2 never splits scan result blocks across a data page Therefore after a loss in communications and while extracting buffered scans Stream 2 contains one or two full data scans and possibly measurement results The end of useful data is marked with and end tag Note that this does not imply that there is no more historical data to extract it does imply that the last piece of useful data has been read from the data page 2 2 6 2 BOOKMARK FORMAT A bookmark contains the calendar month day hour and minute The format is 4 First Byte gt Fourth Byte most significant bit of first byte All numbers are in binary coded decimal X4 months tens X3 X0 months units D7 D4 days tens D3 Do days units H7 H4 hours tens H3 Ho hours units M7 M4 minutes tens M3 Mo minutes units Page 92 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V 1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 2 2 6 3 TIME TAG FORMAT The time tag contains an indication of whether the following data is a scan or a single measurement the channel number and the calendar se
26. 1 Invalid hexadecimal This error is returned when an invalid ASCII hex number has been sent to the interface S72 Unknown internal command The initial code of a command e g I_XX is not recognised S73 Parameter error Indicates an interface command with invalid parameters Page 26 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 2 Part 2 2 1 Chapter 1 IMP Commands 2 1 1 INTRODUCTION This chapter provides information on the use of IMP commands a summary of commands a detailed command directory and suggested command procedures 2 1 1 1 COMMAND STRINGS The following rules apply to command strings a They must not contain more than 256 characters bytes b They may contain a number of individual commands as long as they are separated by semicolons c Commands are executed in order left to right across the string and responses are returned in order d They must not contain unnecessary spaces or lower case characters e Ifa command includes some binary coded information all bytes of this data must be included f Omissions can cause both the command involved and subsequent commands to be misinterpreted 2 1 1 2 IMP COMMAND TYPES Command strings are built from two basic command types General Command applicable to most IMP types Speci
27. 5 2A and switch IMP type 3595 2B set up for events capture The 3595 2A IMP can store up to 6000 bytes of event data whilst the 3595 2B can store up to 512 bytes Both types can transmit up to 112 bytes of data at a time Event data carries information on the time and directional change of a digital signal The time of a detected event is referenced to the IMP internal calendar and clock which is regularly synchronised from the 3595 4C Interface card Synchronisation is performed regularly and does not affect measurement integrity Event data is transmitted in Stream 2 If the on card input buffer for Stream 2 and the relevant IMP is empty the event data is transmitted as soon as it occurs However if the input buffer already holds unread data the IMP stores the results and transmits the event data when the buffer is free Event data consists of Bookmarks Four bytes containing the calendar month day hour and minute Event tags Four bytes containing the channel number direction of transition calendar seconds and milliseconds One event tag is sent per event End tags Four bytes containing only binary zeroes This indicates the end of a set of event data and is used when less than 112 bytes of event data is transmitted Lost event results When the event storage area of the IMP and on card input buffer are full the IMP has nowhere to send or store event results Instead it counts the number of events that occur This data is
28. 53Y This allows the IMP to recognise the calibrate commands b A stable temperature environment of 20 C 3 C The IMP should be powered up and allowed to stabilise at this temperature ideally for 24 hours c An accurate multimeter to measure the output channels Procedure The procedure for calibrating the output voltage of a type 1D IMP is 1 Fit all cables to the 3595 3Y connector block PCB terminal connectors are as shown in Figure 1 4 a The S Net cable is connected to the COMMS IN terminals Strictly observer to and to polarity and the S screen to S connections throughout the network b The multimeter is connected to the channel to be calibrated Note To avoid signal reflections a terminator connector P N 35900222 must be connected across the COMMS OUT terminals of the last IMP in the system The terminator connector is supplied with the S Net host interface package 2 Set the rotary address switches on the 3595 3Y connector block PCB toa number between 01 and 50 3 Insert the 3595 3Y connector block into the IMP to be calibrated 4 Power up the PC 5 Turn the calibration mode off by sending the KA1 command to the IMP Page 67 of 98 Working copy if printed P iIDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 6 Using the CH VO command s
29. Ae sis the database e 1 2 or3 for IMP types 1A 1B 1C 1E 2A and 2B and e 1 2 3 7 for the Universal IMP UIMP types 1H and 1J This command does not apply to type 1D IMP devices On IMP types other than the 1H and 1J the set up data mode strain gauge data etc is stored in one of three databases in the IMP Database 1 contains the set up data selected by the AR CO UN DR KA AM FR and TE commands Database 2 contains the set up data for individual channels mode strain gauge values etc Database 3 contains the scan period defined by the SP command Note that when the scan period is loaded by the IO command with the IMP in continuous scanning mode the new scan period takes effect from the beginning of the next scan On the 1H and 1J Universal IMP the set up data is stored in seven databases This is described in Appendix A of Part 2 SA instructs the IMP to transmit this data to the PC The complete output buffer capability of the IMP is needed to transmit this data Therefore the user must ensure that no data is waiting for transmission at the IMP In addition if two SA commands are sent in quick succession the IMP may ignore the second one due to shortage of buffer space This problem can be overcome by putting another command for example STATUS between the two SA commands If the IMP is powered down it loses the contents of the databases The LOad command in conjunction with previously SAved data allows se
30. MP type 2B Function Enables or disables the software watchdog Once the watchdog is enabled the watchdog output channel channel 20 for UIMP or 32 for digital IMP goes from a O state to a 1 no alarm state The IMP then expects the ST command to be sent within every n seconds If a time out period passes without a ST command being received the output is set to a 0 alarm state The IMP is not reset Disabling causes the output to go into the 0 state The RE command does not disable the watchdog Note Enabling either watchdog causes the output to go into the 1 no alarm state For the output to be disabled from the watchdog both the hardware and software watchdogs need to be disabled Response None Page 65 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 2 1 9 2 1 9 1 SNET to USB Interface 35954U User Manual COMMANDS FOR ANALOGUE OUTPUTS CH VO CHannel VOltage Output Where Note Function Response See also 2 1 9 2 nis an integer that defines the channel number in the range 1 lt n lt 4 X is the output voltage in 4 byte floating point format in the range 10 lt x lt 10 This command applies only to IMP type 1D Sets the specified channel to the specified voltage None OS CH IO CHannel Current Where Note Func
31. Mode Kemel already running In BOOT Program mode the device erases its FLASH prior to connection The Toolkit downloads programming kernels to the device as required The Recommended Speed setting is based on the current device and clock The user may also input their own if this is supported by the kernel and the interface board Recommended Speeds fisz00 E f gt User Specified Use Default aan On the next screen please set Readback Verification to Yes and click Finish Programming Options a Pacer gt a 4 Display eano N iles i5 LCD mot SJ Keyboard Comms m t ch IStrial Device Image y Target Files fe Drive mot What level of device protection would you like r Protection Automatic Interactive C None When programming the device any blocks found to have been written previously will automatically be erased What level of messaging would you like m Messaging Standard Advanced The Toolkit will display verbose messages whenever it is communicating with the Target device This mode is useful for Interface hardware development and Kernel development Would you like to perform readback verification after programming r Readback Verification C Yes No lt Back cancel Now select User Data Area and navigate to the 35954U a20 file supplied in the Firmware Upgrade folder you pr
32. Once the watchdog is enabled power down forces the output into the 0 alarm state The RE command does not disable the watchdog None SF Status data Format n 0 for IEEE 754 floating point format n 1 for binary compressed format This command applies only to the Switch IMP type 2B Command SF defines whether scan data is supplied as IEEE 754 floating point numbers 128 bytes in stream 0 or as a binary compressed quantity 9 bytes in stream 3 for the single trigger or continuous mode of operation The default value is for IEEE 754 floating point format The binary format consists of Byte 1 ASCII character 37 decimal Bytes 2 5 Binary inputs from channels 1 to 32 starting from bit 7 of byte 2 to bit 0 of byte 5 for channels Bytes 6 9 Control bytes one bit per channel A bit value of 0 indicates that the channel is set to status input A bit value of 1 indicates the channel is Not measured or Unknown mode type or range None Page 64 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 2 1 8 8 SW Software Watchdog Ks Where n 0 to disable the software watchdog n 1 to 255 to set the software watchdog time out in seconds Note This command applies only to the Universal IMP types 1H and 1J and digital I
33. RA set CHannel sample RAte Where nis an integer that defines the channel number in the range 1 lt n lt 20 dis an integer that defines the sample rate in the range 1 lt d lt 4 Note This command applies only to IMP types 1H 1J and 2A In the case of the 1H and 1J IMP types the command applies only to channels 19 and 20 Function Sets the sample rate for the specified channel The sample rates selectable are listed in Table 2 15 On power up the IMP selects the default sample rate This rate is suited to mode of operation as shown in Table 2 16 At the sample rates of 20Hz and 1kHz a level change is detected only if four consecutive samples are the sample value This improves immunity against contact bounce and similar effects Note however that the time recorded for event capture is four sample periods late at the lower sample rates Response None Table 2 15 Sample rate settings Rate setting d Sample rate selected 0 Default as on power up 1 20Hz 2 1kHz 3 10kHz 4 100kHz Table 2 16 Default sample rates Mode Default Sample Rate Digital status 20Hz Event counting 1Hz Event capture 1kHz Frequency 100kHz Period 100kHz One shot time 100kHz Page 60 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 2 1 8 2 SNET to USB Interface 35954U User Manual CH TI set
34. SNET to USB Interface 35954U User Manual SD Save Database and RD Restore Database Function Response Note The SD and RD commands provide for a quick set up The SD command saves the database of a previously configured IMP into a Flash PROM Later the RD command can be used to load the current contents of the Flash PROM into the same database When the database is restored two things happen 1 The watchdogs are disabled and 2 Ifthe channel mode is 80x the output is set accordingly Refer to Appendix A for details of the database format Compared with the PC saving and restoring the IMP database over S Net the above method is more convenient but less flexible Stream 3 Single character H SD command only This response confirms that the database has been written Before storing the database in the Flash PROM the SD command generates an internal HA halt command This does not change the state of the COntinuous Scan Parameter While the database is being restored there is no communication with the IMP and S Net This causes polling errors which stop when storage is complete It can take up to three seconds for the IMP database to be restored Therefore after sending the SD command any software application should wait three seconds then clear the error flags from the 3595 4C Interface card and then read Stream 3 for an H character Once this is received the IMP is ready to resume normal opera
35. Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 2 1 4 COMMANDS FOR ANALOGUE AND DIGITAL MEASUREMENTS 2 1 4 1 AR ARm Note This command does not apply to IMP types with analogue outputs i e the 3595 1D Function Arms an IMP Only an armed IMP can respond to a TR Trigger command for scanning all channels This allows individual IMP devices to be armed and only they will then respond to broadcast TR Trigger command Once an IMP is armed it will continue to respond to a TR command until disarmed with DR command Response None See also TR and DI 2 1 4 2 CH MO set CHannel MOde i Ea Note This command does not apply to IMP types with analogue outputs i e the 3595 1D Function Sets the channel mode measurement function and range on specified channel See Table 2 3 through Table 2 7 for encoding details Response If an IMP is given a channel mode command with which it is unable to comply it will return the error message unknown mode type or range but only when instructed to measure Any channel can be set to skip The channel is then not measured and returns the error message not measured instead of any data requested Channels set to skip can be left without termination Channels set to a particular mode other than skip but not used s
36. age 53 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 Function Response See also SNET to USB Interface 35954U User Manual Sets the integration time of all analogue measurements It provides for optimum rejection of 50Hz 60Hz or 400Hz supply frequencies Also allows a shorter integration time to be selected for increased scan rates at the expense of reduced interference rejection Note A scan refers to the series of measurements made on all IMP channels and obtained on data stream 0 Typical scan rates scans per second obtained with shorter integration times are show in Table 2 13 The scan rates shown in Table 2 13 are for individual IMP devices on a fixed voltage range See SP command for further information Mixing fast and slow IMP devices in a large system may result in the fast IMP being slowed down XXXxxx Shows the effect on the overall scan rate of increasing the number of fast IMP devices types 1A and 1B in a five IMP system With a small system such as this the fast IMP devices are not slowed down by the slow IMP devices Actual throughputs are also dependent on the PC and the application software Error FF87 Unknown mode type or range is returned instead of a measurement value when an unsupported integration time is requested SP Table 2 13 Scan rates V integration times
37. am link 3 1 2 Fig 1 2 Program link with jumper attached 4 Connect the Interface to your PC with the USB B cable There should be no LED activity when the Interface is in programming mode 5 Download the 35954U Upgrade folder from our site This folder contains the upgrade file and software required 6 Install the Renesas Flash Development Toolkit which you downloaded and once complete run the Renesas Flash Development Toolkit 4 05 Basic 7 When the program runs you will be asked to select your device Navigate down the list of Interfaces and select H8S 2398F and click Next Page 95 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual Choose Device And Kernel The FLASH Development Toolkit supports a number of Renesas FLASH devices Select the device you wish to use with this project from the list below Filter Full Name H8S 2329EF H8S 2329F H8S 2339EF H8S 2339F H8S 2366F H8S 2367F H8S 2376F H8S 2377F H85 2378F H8S 2398F H8S 2602F i 2 A ON NNN a am Poh ol N Oobjooooocea obpoocooocee it v Cancel 8 On the next screen select the COM port which is associated with the Interface on your machine 9 Nowenter 14 74 as the frequency for the Interface Device Settings Please ente
38. anual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 2 1 9 5 OS Output Status Note This command applies only to IMP type 1D Function This command returns the status of the analogue channels Response Stream 3 12 characters Where digits d1 d2 d3 d4 relate to channels 1 2 3 and 4 they are either V or T depending on whether the last command sent to that channel was CHnVOx or CHnClx e represents the output status code as shown in Table 2 19 For example 30 VOVOIOIO shows that channels 1 and 2 have been correctly set for voltage output and channels 3 and 4 have been correctly set for current output Table 2 19 Analogue Output Status codes e Code Meaning 0 OK channel is correctly set 1 Calibration mode on but calibration data corrupt and 2 Value requested is out of range EEPROM not fitted or IMP not yet calibrated The last channel output command sent to that channel was not executed Page 70 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 2 1 10 ADDITIONAL COMMANDS FOR 3595 IMP TYPES 1H AND 1J 2 1 10 1 DEFINITION OF TERMS Physical Channel These are the twenty channels present on the IMP connector block in the range of one through
39. atus from the IMP at address 5 I_IA05 ST _SR05312 The first command contains the address of IMP5 the second command is a Request Status IMP command sent by the interface to IMP5 and the third command reads the 12 character status from IMP 5 stream 3 b Fetch data continuously from IMP 05 1 1A05 SE CO TR The first command sets the IMP address for communication with IMP 05 The next two commands i Set the IMP channels to either Volt dc auto ranging analogue IMP or digital status digital IMP ii Enable continuous measurement 1 4 1 5 INCORRECT INTERFACE COMMANDS Any commands received at the interface that do not start with an _ are routed through to the S Net Therefore it is possible to send an IMP a command which it is not capable of complying This may have no noticeable effect if the command does not instruct an immediate response A subsequent command to perform a measurement can then give an error message or an incorrect reading It is the responsibility of the application program to check that any commands sent are of the correct syntax and that the IMP or interface is capable of complying with them Page 17 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 1 4 2 INTERFACE COMMAND SUMMARY The function of each interface command is s
40. c docx Measuresoft Development Ltd Version 1 0 0 0 2 1 4 3 Note Function Response See also 2 1 4 4 Note Function Response See also SNET to USB Interface 35954U User Manual CO COntinuous measurement This command does not apply to a type 1D IMP Instructs an ARmed IMP upon receiving a TRigger to continuously scan all channels and return data An IMP can hold the measurement results of two complete scans in a pair of output buffers When continuous measurement starts the IMP puts the result of the first scan in the first buffer and then puts the results of the second scan in the second buffer If the scan period is set to Oms default value and the PC is able to read the results of the first scan by the time the second scan is complete the results are placed in the first buffer This sequence continues and allows the IMP to continuously scan inputs without waiting for scan data to be read by the PC If the scan period is defined the start points of successive scans are separated by this period Also if the PC is unable to read the scan data as fast as the IMP provides it the IMP hangs whilst to PC catches up Note that Universal IMP type 1H and 1J do not hang in the historical mode but continues scanning even when the output buffer is full This is to allow the alarm inputs to continue to be monitored Until the PC reads the data from the buffer the data presently stored is not
41. ce ranges 201 800A drive 250 range 202 800A drive 2500 range 203 800A drive 2k5Q range 204 80UA drive 25kO range 210 800 80pA drive auto ranging Two wire resistance ranges 211 Not Used 212 Not Used 213 800A drive 1k5Q range 214 80UA drive 25kO range 220 800 80pA drive auto ranging Two wire resistance ranges 221 Not Used 222 Not Used 223 800A drive 5000 range 224 80UA drive 25KQ range 310 314 Thermocouple type E Same modes for 1A 1C and 1E 320 324 Thermocouple type J 330 334 Thermocouple type K 340 344 Thermocouple type R The third digit sets the range 350 354 Thermocouple type S 0 auto ranging 360 364 Thermocouple type T 4 least sensitive range 10V 370 374 Thermocouple type B 380 384 Thermocouple type N 390 394 Thermocouple User TC 1 User defined linearisation See UT description 3A0 3A4 Thermocouple User TC 2 in Section 1 3 7 page 1 45 400 800A drive auto ranging Four wire 1000 RTD PRT ranges 401 800A drive 200 C to 180 C 402 800A drive 200 C to 400 C 403 800A drive 200 C to 600 C 410 800HA drive auto ranging 411 800A drive 200 C to 180 C 412 800A drive 200 C to 180 C 413 800UA drive 200 C to 600 C Three wire and four wire resistance and temperature measurements use a pair of channels connected as shown in Chapter 12 of the 3595 Series IMP Installation Guide The channel mode is configured for the odd numbered channel Page 38 of 98 Work
42. command to measure one channel or short numeric responses Stream 2 Event information Stream 3 Character ASCII data in response to some commands status information or confirmations etc 1 1 4 INTERFACE AND IMP COMMANDS Commands are used in the form of ASCII character strings For example the RESET command is RE A command may be made more specific by using it with a number For example the command CL2 means clear event totalize counter on channel 2 Multiple commands may be sent in strings to IMPs They must be separated by semicolons For example ST CL2 A directory of Interface commands is presented in Part 1 Chapter 4 and a directory of IMP commands is given in Part 2 Chapter 1 of this manual Page 6 of 98 Working copy if printed P iIDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 1 2 Chapter 2 Interface Installation This chapter outlines the installation of the 35954U Interface It details how to e Connect the Interface to IMPs via S Net e S Net Termination e Connect an external power supply e Connect to a PC 1 2 1 CONNECTING THE INTERFACE TO IMPS VIA S NET The 35954U Interface unit is connected to the S Net via a 9 way female D type connector on the rear panel of the unit labeled S Net The connections to this are listed in Table 1 1 below
43. compensation requires both the linearisation polynomial and its inverse User defined thermocouple linearisation acts in the same way as predefined thermocouple linearisation with respect to the AM TR and TC commands See mode codes 310 3A4 in Table 1 7 page 1 14 If a thermocouple is measured and the corresponding linearisation equation has not been defined the error code FF82xxxx is returned instead of the 4 byte result CH MO CH PL Post Linearisation Where Function Note See also nis an integer that defines the channel number in the range 1 lt n lt 18 lt gt defines the user defined linearisation equation to use 1 or 2 0 disables post linearisation on channel n Enables conversion of a measured parameter into alternative units with the linearisation function Y asx agx gx aX asx ay Where x is the input parameter and y is the output The coefficients used are those defined by the PL command The CH PL command can be used with channel unit conversion Post linearisation is applied first and then the unit conversion PL Page 73 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 4 Historically called the cold junction Now known more accurately as the reference junction Similarly the
44. conds and milliseconds It has the following format lt First Byte gt Fourth Byte gt aon SS RaR P eP ooo nost significant bit of first byte M if M 0 a single measurement follows the time tag if M 1 a scan follows the time tag C4 Co channel number in binary Not used if M 1 a scan All remaining numbers are in binary coded decimal 7 S4 seconds tens 3 S9 seconds units R4 R7 milliseconds hundreds R3 R o milliseconds tens P7 P4 minutes units 2 2 6 4 END TAG FORMAT An end tag in historical data indicates that there is no more data following it in the data page The format is as follows 4 First Byte gt lt Fourth Byte gt 00000000 ost significant bit of first byte Note that the end tag does not imply that there is no more historical data to extract it does imply that the last piece of useful data has been read from the data page Page 93 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 2 2 7 SNET to USB Interface 35954U User Manual IMP ERROR MESSAGES Error messages are transmitted by an IMP instead of a 4 byte result They occur only in response to a ME or TR command An error message is in the form of a 4 byte analogue result with a negative sign and an exponent of 255 In hexadecimal format this is represented by any number i
45. d whilst the port receiving the INitialize remains enabled d IMP address is set to 1 Page 20 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 Response 1 4 3 4 Function Response 1 4 3 5 Function Response 1 4 3 6 1 4 3 7 1 4 3 8 Function SNET to USB Interface 35954U User Manual e Configured for all 50 IMP addresses Initialize acknowledge The acknowledge message contains the status and issue of the firmware in the interface It has the format S01 status CX where C is the status and X is the issue The acknowledgement is preceded by a sequence of three nulls and a terminator to terminate any line that the interface may be sending when the interface interprets the _IN command PO Power Off IIN The Initialize command shuts down the interface which in turn shuts down the S Net S00 Powered down _PS Product Serial Number PS The product serial number commands returns the product serial number in hex SOO XXXXXXXXXXXXXXXX _ SRaasn Stream Read in Acsii imp address stream and bytes SRaasn STaasn Stream Test imp address stream SRaas _ SBaasn Stream Read in Binary imp address stream and bytes SRaasn The Stream commands instructs the interface to process a single block of data from IMP address aa a
46. d to the Interface it is possible to use longer lengths of S Net cable than those listed in Table 4 2 It is important however that the core of the cable is of an adequate gage The actual gage required depends on the number of IMPs to be powered their distribution along the cable and the power supply voltage To select a suitable wire gage and supply voltage for a given system refer to the cable selection graph Fig 4 1 This graph assumes the worst case distribution of IMPs i e all IMPS grouped at the far end of the cable ad incorporate a safety factor 1 3 3 2 1 EXAMPLE OF THE USE OF THE CABLE SELECTION GRAPH Say for example that the supply voltage has been fixed at 50V and 10 IMPS are to be powered via the S Net cable The total cable length is expected to be around 400 metres Refer to Fig 4 1 and determine the point on the graph where 10 IMPs and 0 4km intersect in this case the 20 AWG region This is the smallest gage cable that can be used Therefore the 20 16 or 14 AWG cables are suitable Page 14 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual Fig 3 1 Graph showing recommended minimum wire gage for 50V external supply current limited to 3A with minimum voltage at IMP of 100V Cable Gage AWG 12 3 4mm 16 1 3mm m 20 0 5mm 24 0 2
47. e 1 6mA drive 2 200mV range 660 663 Three wire 4mA drive 3 2V range 670 673 Three wire 0 8mA drive Page 35 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual Table 2 5 Mode Codes for IMP type 2A Digital Code m Mode Set Comments 000 Skip 700 Digital status Event count totalise On receipt of a measurement trigger keeps a 740 ve going edge continuous count of events This count may be 741 ve going edge cleared either by the CL command or by setting the 742 ve or ve going edge channel mode again to event count totalise Event count increment A continuous count of events is kept since the last 750 ve going edge trigger On receipt of the next trigger the event 751 ve going edge count is stopped the result is sent to the PC and 752 ve or ve going edge another event count is begun Event capture 760 ve going edge Enabled by EV command only 761 ve going edge 762 ve or ve going edge 800 Switch output off high For digital output set channel to logic 1 or 0 801 Switch output on low Frequency Measurement 900 gate time 10ms 901 gate time 100ms 902 gate time 1s 903 gate time 10s Multiple periods 910 1 period Returns the time over which periods are counted 911 10 periods Measurement starts on the negative go
48. e which is connected to a D type connector on the Interface The connection details are given in Chapter 3 Table 1 1 lists the cables selected as being particularly suitable for liking IMPs to the Interface The cables are intended for general purpose use Table 1 1 Cables recommended for S Net Gage single Type conductor AWG 12 Brand Rex 712459 14 Brand Rex CD8920204 16 Brand Rex T12460 Alpha 9820 Belden 9860 18 Brand Rex CD8920251 Belden 9250 20 Brand Rex BC57207 Alpha 9818 Belden 9207 Belden 9815 direct burial 24 Brand Rex BI56641 Alpha 2400 Belden 8641 The large diameter of these cables necessitates special consideration when making connections to the IMP For details see the IMP Installation Guide Approximately 10 meters of 24 AWG Belden 8641 cable are provided with each module This is sufficient for small data acquisition systems or for testing purposes The connections are S NET ve black and S Net ve white 1 3 2 POWER SUPPLY Each IMP consumes approximately 1W 1 2W at power up 35951D Analogue output IMPs can in some applications require more In these circumstances they need special consideration refer to the 3595 Series IMP Installation Guide for details IMPs may be supplied with power in one of three ways 1 From the internal power supply of the Interface via the S Net cable The internal power supply of the interface can provide 43V for the S Net system 2 From an e
49. e four bytes there represent 1 0012 2 10 012 2 2519 Note Zero is represented by all four bytes being all zeroes Page 84 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 2 2 3 FOUR BYTE RESULT FORMAT Analogue and digital data are sent in a 4 byte result format that closely resembles the IEEE 754 format The 4 byte format differs from IEEE 754 in having a shorter mantissa that is 17 bits rather than 23 Four of the six bits are thus freed and are used to hold information on the significance of the result as follows lt First Byte gt lt Fourth Byte gt S e ep Moy M46 M45 Mg m m 00S S S S L Implied 1 of mantissa Fractional part of mantissa Binary exponent with excess of 127 m most significant e most significant Significance Sign bit most significant bit of first byte The significance is the number of valid decimal places in the result This is decided by the range selected in the IMP Page 85 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V 1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 2 2 4 EVENT RESULT FORMAT Event results are obtainable only from digital IMP type 359
50. el is also cleared when that channel is set again to the totalise mode The maximum number of events that can be recorded per channel by the event counting circuitry is 16 777 215 after which the rolls over to zero No indication of this is given Table 2 6 Mode Codes for IMP type 2A Switch IMP Code m Mode Set Comments 000 Skip 700 Digital Status Event capture 760 ve going edge Enabled by EV command only 761 ve going edge 762 ve or ve going edge 800 Switch output off high For digital output sets channel to logic 1 or 0 801 Switch output on low Note ve edge refers to a negative going edge a transition from high to low ve edge refers to a positive going edge a transition from low to high Channels 29 to 32 are digital input output channels Digital outputs are set when the IMP devices receive the relevant CH MO command For more details on each individual mode refer to the IMP Installation Guide Page 37 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual Table 2 7 Mode Codes for IMP type 1H and 1J Code m Mode Set Comments 000 Skip 100 Volts dc auto ranging 101 Volts dc 20mV range 102 Volts dc 200mV range 103 Volts dc 2V range 104 Volts dc 10V range 200 800 80pA drive auto ranging Three wire resistan
51. en transmitted continuous scanning will be started by the TR command On IMP types other than the 1H and 1J the channels set for event capture skip or digital output are not affected by this command but return not measured instead However the digital channels 19 and 20 on the 1H and 1J IMP types when set for digital output respond to an ME command by returning the present status TRigger will start counting on all channels set to event count increment or event count totalise provided counting has not already started If counting has already started Trigger will return to number of events recorded so far additionally channels set to event count increment will begin counting from zero Stream 0 Each IMP transmits a 4 byte result for each of its channels If the status data format command instructs the Switch type IMP for compressed data this data will appear over stream 3 as a 9 byte quantity AR EV SF and for 1H and 1J IMP types RM Page 52 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 2 1 5 2 1 5 1 Where Note Function 2 1 5 2 Where Note Function Response 2 1 5 3 Where Note SNET to USB Interface 35954U User Manual COMMANDS FOR ANALOGUE MEASUREMENTS ONLY CA CAlibrate ris an integer 1 lt rs 8 which defines the analo
52. et the channel output voltage first to OV and second to 10V and in each case measure the voltage actually output by the IMP 7 Using the measurements obtained in Step 6 send the channel calibrate voltage command CHnCVxy In this command x is the actual voltage measured when OV was requested and yis the actual voltage measured when 10V was requested 8 Check the calibration response in stream 3 see Table 2 18 to ensure that the IMP channel has been successfully calibrated Table 2 18 Calibration responses e Code Meaning 0 Calibration completed 1 Invalid range 2 EEPROM fault missing or not working 3 35953Y calibration connector not fitted e 1 is caused either by an arithmetic error in calculating the calibration coefficients or by the same coefficients not allowing the full range of the channel to be utilised Either an incorrect measurement was made or there is a faulty circuit in the IMP 3595 3Y Calibration Connector CH2 CH4 V out lout lin V out lout lin a GG CH 1 CH3 V out lout lin Terminator for last IIMP in system HOST PC i F ANAM Page 68 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual Figure 2 4 connections to 3595 3Y calibration block connector CH Cl CHannel Calibrate current
53. eviously downloaded Page 97 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual FDT Simple Interface Unsupported Freeware Version Options BASIC FILE PROGRAMMING Device H8S 2398F Peas COM10 File Selection Download File MV User Data Area iyan craven D esktop 3595 4U Firmware Programming 35954U a20 gt iat b Program Flash j Flash Development Toolkit and flash programming components are provided without support 05 Windows XP Admin FDT API initialised version 4 05 00 009 FCF Settings Applied H85 2396F C Program Files Renesas FDT4 05 ker 13 Click Program Flash and allow the upgrade to complete The upgrade progress and any errors will appear in the status box located at the bottom of the screen 14 Once completed exit the program 15 Disconnect the Interface remove the Jumper from the program link and replace the top cover and front panel securing with the 4 screws 16 You can now reconnect the Interface to your machine and confirm the successful upgrade Page 98 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0
54. fic Command applicable to a particular type of IMP For example the EV command applies only to the digital and switch IMP devices 2 1 1 3 NUMBERS IN COMMANDS The majority of commands require one or more numbers to further specify the command For example the ME measure command must be specified with a channel number Unless otherwise stated in the command directory these numbers are ASCII keyboard characters and not numeric values 2 1 1 4 EXAMPLES OF COMMAND STRINGS A string of two or more commands may be sent by inserting semicolons between individual commands On receipt of a command string the IMP executes each command in turn left to right Each command string should not exceed 256 characters bytes in length including semicolons As an example the command sequence SE TR provides a quick measurement set up 1 Onan IMP other than the Universal IMP 1H and 1J it selects volts dc auto ranging for analogue versions or digital status for digital and switch versions 2 It arms the IMP to make measurements 3 It tells the IMP to take a scan that is measure on all channels Page 27 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual Other useful command sequences are a RE CHnMO103 MEn For analogue IMP and Universal IMP Thi
55. g copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual and the terminators depend on the port and the Set Interface command e g H101 lt terminator s gt 40A00000 lt terminator s gt 1 4 4 2 INTERFACE ERROR STATUS FORMAT The message consists of an identifier to indicate a status message and an error status number which identifies the particular error or status information Additional information may also be sent in the remaining bytes innbO b1 b2 bn lt terminator s gt where i s for error status nn 00 to 49 for status numbers or 50 to 99 for error numbers b0 bn bytes of information depending on the error status number The terminators used depend on the port and the Set Interface command e g S00dd mm yy hh mm ss th lt terminators gt The data returned may contain time information as in the above example or the IMP address and stream information When using the ENQ SOH protocol on the Serial port the complete response from the stream is terminated after the last byte with the ETX control character e g H101 lt terminator gt 40A00000 lt terminator s gt ETX Page 25 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd
56. gue input range to be calibrated This command does not apply to 1D 2A or 2B IMP types Allows calibration of a specified measurement range on an IMP Calibration should normally be left to Measuresoft or to those users with specialist reference equipment Equipment and Procedure These are detailed in the operating manual entitled Calibration of the 3595 Series Analog IMPs P N 35952233 SR DRift correct d 0 continuous update default setting d 1 fixes drift correct value to existing setting d 2 sets drift correct value to a nominal test value This command does not apply to 1D 2A or 2B IMP types This command is intended for diagnostic and test purposes only An analogue IMP continuously corrects for drift in between measurements By using the DR command the correction may be continuously updated frozen at the last value or set toa specific test value None FR Set integration time i f 0 20 00ms integration time for 50Hz or 400Hz supply areas f 1 16 67ms integration time for 60Hz supply areas f 2 5 00ms integration time for 400Hz supply areas f 3 4 17ms integration time f 4 1 25ms integration time f 5 1 04ms integration time This command does not apply to 1D 2A or 2B IMP types Furthermore IMP types 1A and 1C must have software status E onwards and IMP type 1B must have software status C onwards to be able to comply with the commands FR2 FR3 FR4 and FR5 P
57. he event status contains the event level instead of the event transition all other information is the same 4 First Byte gt lt Fourth Byte gt most significant bit of first byte L status level if L 1 status high if L 0 status low C4 Co channel number in binary C4 is most significant Note Channel numbers entered for the 3595 2A IMP correspond exactly with the physical channels 1 Channel 1 2 Channel 2 etc With the 3595 2B IMP however channel numbers 0 through 31 represent the physical channels 1 through 32 All remaining numbers are in binary coded decimal S7 S4 seconds tens 3 S9 seconds units R4 R7 milliseconds hundreds R3 R o milliseconds tens P7 P4 milliseconds units 2 2 4 4 END TAG FORMAT An end tag indicates the end of a set of event data It is used when less than 112 bytes are transmitted The format is as follows 4 First Byte gt lt Fourth Byte gt 00000000 ost significant bit of first byte Page 88 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V 1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 2 2 4 5 LOST EVENT RESULT FORMAT The lost event result contains the number of events lost due to the 4C Interface card input buffer being full The format is as follows 4 First Byte gt lt Fourth By
58. he trigger This is so that in each IMP the scan begins at a pre defined subdivision boundary of a second minute or hour Each IMP clock is synchronised to that of the PC Therefore all scans will start at the same point in time The time subdivision used for scan synchronisation equals the scan period where this is an integral sub multiple of 100ms 1s 60000ms 1m or 3600000 1h The algorithm that each 1H and 1J IMP uses for scan synchronisation operates as shown in Figure 2 2 Pie ce TRIGGER pi SP lt 1000 Is 1000 SP and integer Is SP lt 600000 Delay scan start to next subdivision boundary Page 49 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual Figure 2 2 Scan synchronisation of 1H and 1J IMP types Example The command SP 250 is given which specifies a scan every 250m 1000 250 4 remainder 0 Therefore depending on the time at which the trigger occurs the scan is delayed until Oms 250ms 500ms or 750ms past the second lt Actual scan time a Scan Period oo E Se a oe oe GOON hr Time 08 10 03 08 10 05 Triggers 1 and 2 Trigger 3 Figure 2 3 SP 250 Command Example A scan starts within 50ms worst case of the required time Only the first scan is aligned Thereafter
59. hh mmiss th The command Time command loads the time and date into the real time clock calendar of the interface DD day 00 31 MM month 00 12 YY year 00 99 hh hour 00 24 ss seconds 00 60 th Tens and hundredths of seconds 00 99 None TI command Time request Page 22 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual Function The command Time request command requests the interface to return the time and date Response A message with the format S00 DD MM YY hh mm ss th where the parameters have the same meaning as in the I_TI command above If the time has not been set since either an _IN command or since power up then the response will be S00 00 00 00 00 00 00 00 Page 23 of 98 Working copy if printed P iIDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 1 4 4 OUTPUT FORMATS The blocks of ASCII data known as messages that are output from the Serial and USB ports of the interface may contain S Net measurement status data or interface error status information The first byte in a message identifies the message type S Net measurement results from Streams 0 1 and 2 are sent as HEX characte
60. hot junction is now known as the measurement junction 2 1 10 6 Where Function See also PL Post Linearisation ae ae lt gt defines the linearisation equation to use 1 or 2 a5 ag are IEEE 754 floating point numbers for the coefficients of a fifth order polynomial Defines the coefficients of the polynomial that is applied by a CH PL command If the polynomial is undefined the result returned is zero and not an error code CH PL Where Function See also nis an integer that defines the channel number in the range 1 lt n lt 18 lt limit gt is an IEEE 754 floating point number that defines the limit in channel units lt gt is an IEEE 754 floating point number that defines the limits for hysteresis in units Defines the high limit for alarm checking on a channel This is used only in conjunction with the CH GO command The effect of hysteresis is described in the following example 1 The limit for a thermocouple is set to 100 C 2 Hysteresis is set to 3 3 With arising temperature an alarm is signalled at 113 C The signal remains until the temperature falls below 107 C CH LL and CH GO Page 74 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual Where nis an integer that defines the channel number i
61. hould be shorted out at the connector block Note By using an HV connector block type 3D the 10V range can be converted into a 250V range If the HA attenuated input is used results from the IMP must be multiplied by 50 Example The command CH1MO330 configures channel 1 of an addressed IMP type 3595 1A or 1C to measure K type thermocouples Page 33 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual Table 2 3 Mode Codes for IMP Types 1A 1C and 1E Code m Mode Set Comments 000 Skip 100 Volts dc auto ranging 101 Volts dc 20mV range 102 Volts dc 200mV range The 10V range can extend to 12V 103 Volts dc 2mV range 104 Volts dc 10mV range 310 314 Thermocouple type E The third digit sets the range 320 324 Thermocouple type J 0 auto ranging 330 334 Thermocouple type K 4 least sensitive range 10V 340 344 Thermocouple type R 350 354 Thermocouple type S Type B and N thermocouples may be used only 360 364 Thermocouple type T with an IMP marked with product status C3 370 374 Thermocouple type B onwards 380 384 Thermocouple type N 500 Current dc auto ranging 501 Current dc 200A Channels used for current measurements require 502 Current dc 2mA the fitting of a 1000 shunt See IMP Installation 503 Current dc 20mA G
62. ift it out of the PCB The jumper should be retained for future use To reinsert the jumper push it firmly into the PCB 4 Slide the panel back into the housing unit and with care secure the 4 screws Figure 1 3 Location of the terminator jumper on the main PCB of the 35954U Interface Terminator Jumper 1 2 3 CONNECT EXTERNAL POWER SUPPLY Where the power is supplied to the IMPs down the S Net cable this power may be generated either by the internal power supply of the 35954U Interface Unit or where this is inadequate for the system in use by an external supply The external power supply is connected via a 9 way D Type connector located at the rear of the unit The connections to this are located in Table 1 2 1 2 3 1 Table 1 2 External Power Connections Pin Function 1 5 GND 6 9 24 to 48V Page 9 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual The cable requirements for S Net power for either the internal or external power supply are detailed in Chapter 3 as are the requirements for the external supply Note When an external supply is used the 35954U Interface must still receive ac power to provide its own dc rails Connection of the external supply automatically disconnects the internal supply from S Net 1 2 4 CONNECT TO A PC The 35954U
63. ignore these The command TR will then be processed and executed However it is possible to send an IMP a command that it understands but can t obey For example the command may specify an invalid mode or range In such a case the IMP stores an appropriate error code and returns this when it next receives a measure or trigger command for the affected channel s Thus when the command string does not instruct an immediate response the error is not immediately reported this may lead to confusion Therefore it is important that the application software checks that each command sent has the correct syntax and that the parameters are valid 2 1 1 6 COMMAND DELAYS To ensure that an IMP correctly executes commands it is good practice to insert a delay of 100ms between command strings and a delay of 500ms after each of the following commands REset TRigger and HAIt Page 29 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 2 1 2 COMMAND SUMMARY 2 1 2 1 Table 2 1 IMP Command Summary Applicable to 3595 1A 1B etc Gonitiand AA 4B AC D 1E 1H i 2A 2B Purpose AR t x Arms an IMP CH MO fi i i i i S Sets channel mode CO i x i ii 5 5 Continuously scan channels DI i g s ji i bg i Cancels the AR command HA
64. incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual P7 P4 minutes units Page 91 of 98 Working copy if printed P iIDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 2 2 6 HISTORICAL DATA FORMATS FOR 3595 1H and 1J With the result format set to historical results from 3595 Series IMP types 1H and 1J are preceded with a bookmark and time tag These are described in Section 3 6 2 and 3 6 3 In addition to increase data throughput and thus allow the historical buffer to be emptied quickly after a temporary loss of S Net the data streaming is completely reorganised This allows up to 240 bytes of scan or single measurement data to be passed back in Stream 2 to the Host PC for every poll Data streaming for historical results is described in Section 3 6 1 The end of useful data in Stream 2 is defined by an end tag This is described in Section 3 6 4 2 2 6 1 HISTORICAL DATA STREAM Historical data is carried on Stream 2 This is enlarged to 240 bytes so that more than one scan and possibly some single measurements can be returned every poll After a temporary loss of S Net the enlarged Stream 2 allows the Host PC to extract data from the historical data buffer as quickly as possible The Host PC can then get up
65. ing copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual e g channel 1 Any configuration set up for the companion even numbered channel e g channel 2 is ignored but for good practice it is recommended that this channel is configured for skip code 000 Code m Mode Set Comments 500 Current dc auto ranging Channels used for current measurements 501 Current dc 200A require the fitting of a 100Q shunt See IMP 502 Current dc 2mA Installation Guide 503 Current dc 20mA 504 Current dc 1mA Same modes as for 1A 1C and 1E 700 TTL logic levels Digital status inputs 701 12V 3V 9V logic levels Codes 701 and 702 apply only to channels 1 702 Two wire 25KQ measurement through 18 1 high V or Q measured 0 low V or Q measured For channel 19 and 20 the only logical level mode applicable is mode 700 Selection of the TTL or 12V logic levels is made by split pads in the connector block 710 Reserved for internal use 720 Reserved for internal use 740 ve going edge Event count totalise 741 ve going edge A continuous count of events is kept reset only 742 ve or ve going edge by the CL command Same modes as for 2A 750 ve going edge Event count increment 751 ve going edge A continuous count of events is kept since the 752 ve or ve going edge last trigger
66. ing edge 912 100 periods 913 10000 periods One shot time 920 ve going start ve going stop Measures ve pulse width 921 ve going start ve going stop Measures ve pulse width Note ve edge refers to a negative going edge a transition from high to low Event Count ve edge refers to a positive going edge a transition from low to high This facility permits a number of events to be counted The events transitions to be included in the count can be ve ve or both Two types of count are offered increment or totalise These operate as follows Increment On receipt of a measurement trigger an event count is started Then on receipt of another measurement trigger the event count is stopped The result is sent to the 3595 4C Interface card and another count begins Page 36 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual Totalise On receipt of a measurement trigger events are counted until an HA halt command is received or until the channel mode is set to Event Count Increment In the latter case the counter is cleared prior to starting the incremental count If a CL clear command is received at any time the event counter is reset to zero A new count is started on receipt of the next measurement trigger The event counter of a particular chann
67. limits appears under the flow diagram as shown above After the flow diagram the following information is given Function Description of the command function Response What the IMP transmits to the host in response to the command Page 19 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 1 4 3 1 Function Response NOTE 1 4 3 2 1 4 3 3 Function SNET to USB Interface 35954U User Manual Aaa fiom Deletion The Imp Address command specifies the address of the IMP that is to receive the IMP commands This address remains in force until changed by another IMP address command For normal operation aa takes the values 00 lt aa lt 50 To transmit to all IMPS aa 00 this is particularly useful for sending a broadcast trigger The default setting for aa is 01 None A transmit error S50 is not indicated should an IMP fail to receive a command transmitted to all IMPs i e when aa 00 LIN Initialize IIN LIP Initialize with Poll Table _IP lt 0 or 1 for 50 Imps gt The Initialize command initializes the interface which in turn initializes the S Net The default set up obtained on initialization is as follows a Crystal derived time synchronisation b Terminator is Carriage Return Line Feed for the Serial and USB ports c The output to the other port is disable
68. me tag into the event buffer This command operates independently whether events are enabled or not If the event buffer is full this command in part or in full is ignored It will not affect the events lost count Note Only a digital IMP with a product status marked B4 onwards and the Switch IMP are able to comply with this command Event Status data is sent in stream 2 For a detailed explanation on event status formats see Chapter 2 CH MO and EV Page 63 of 98 Working copy if printed P iIDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 2 1 8 6 Where Note Function Response 2 1 8 7 Where Note Functions Response SNET to USB Interface 35954U User Manual HW Hardware Watchdog ea et n 0 to disable the watchdog n 1 to enable the watchdog This command applies only to the Universal IMP types 1H and 1J and digital IMP type 2B Enables or disables the hardware watchdog Once the watchdog is enabled the watchdog output channel channel 20 for UIMP or 32 for digital IMP goes from a 0 state to a 1 no alarm state If a time out period passes without the IMP being patted the output is set to a 0 alarm state The IMP is reset into the power up state The watchdog can then be re enabled by sending the HW1 command Disabling causes the output to go into the 0 state
69. mm n a 2 5 2 1 cable length km Page 15 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 1 4 Chapter 4 Interface Commands 1 4 1 INTRODUCTION This chapter describes the commands that are used to control the 35954U Interface The commands used to control the IMPs on the S Net are described in Part 2 of the manual 1 4 1 1 COMMAND STRINGS The following rules apply to command strings 1 Individual commands within a command string must be separated by semi colons Any number of commands may be strung together in this way The commands are executed in order left to right across the string and the responses are returned in the same order 2 Command strings must not contain unnecessary spaces or lower case characters 1 4 1 2 COMMAND TYPES Command strings are built from three basic command types 1 Interface Commands Used only to control the 35954U and not routed to IMPs on the S Net These commands always start with I 2 General IMP Commands Applicable to most IMPs in the system 3 Specific IMP Commands Applicable only to a specific type of IMP For example the EV command applies only to the 35952A Digital IMP The IMP commands are detailed in Part 2 of the manual 1 4 1 3 NUMBERS IN COMMANDS The majority of commands req
70. mponents This provides the user with a reference or a means to operate with a missing corrupted or non programmed non volatile memory None CA CH CV and CH Cl UN UNits of temperature ea a This command does not apply to IMP types 1D 2A and 2B Decides the units of temperature used for 1 Temperature measurement results thermocouple and RTD 2 Setting the external reference temperature with the TR command The IMP default is C on power up None Page 55 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 2 1 6 2 1 6 1 Note Function Response See also 2 1 6 2 Where Note Function Response See also SNET to USB Interface 35954U User Manual COMMANDS FOR THERMOCOUPLE MEASUREMENTS AM AMbient temperature reference This command applies only to IMP types 1A 1C 1E 1H and 1J Instructs the IMP to use the ambient temperature as a reference for those channels set for thermocouple measurement The ambient temperature is sensed by a thermistor in the IMP connector block This is the default power up condition To set an external temperature reference use the TE command None TE TE set external temperature reference Lo tis the external reference junction temperature defined by an IEEE 754 floating point number in the range 30 C 22 F
71. n excess of FF800000 In IEEE 754 floating point format this is equivalent to Not a number FF81 xxxx FF82 xxxx FF83 xxxx FF84 xxxx FF85 xxxx FF86 xxxx FF87 xxxx FF88 xxxx FF89 xxxx FF8A xxxx FF8B xxxx FF8C xxxx FF8D xxxx FF8E xxxx FFFF xxxx Analogue overload The input to an analogue measurement channel has exceeded the maximum value of the present range User thermocouple undefined Returned when a channel mode is set to 39x or 3Ax but the corresponding thermocouple has not been defined 3595 1H and 1J only Out of linearisation range Returned by a thermocouple channel when the temperature is out of measurable range Ambient temperature range The IMP has been instructed to use a temperature reference outside the permitted range 30 C to 80 C Transducer error The IMP analogue to digital converter is unable to decide a value This is commonly du to an open circuit input or a large over voltage Open circuit thermocouple error Open circuit thermocouple checking is enabled and the IMP detected a failure Unknown mode type or range The IMP has been instructed to select an inapplicable channel mode or an unsupported integration time This error code is unassigned Channel number out of range A channel number n outside the permitted range has been specified The permitted range is 1 lt n lt 10 for IMP type 3595 1B or 1 lt n 20 for IMP types 3595 1A 1C 1H 1J and 2A
72. n the range 1 lt n lt 18 lt limit gt is an IEEE 754 floating point number that defines the limit in channel units lt i gt is an IEEE 754 floating point number that defines the limits for hysteresis in units Function Defines the low limit for alarm checking on a channel This is used only in conjunction with the CH GO command The effect of hysteresis is described in the following example 1 The limit for a thermocouple is set to 10 C 2 Hysteresis is set to 3 3 With a falling temperature an alarm is signalled at 7 C The signal remains until the temperature rises above 13 C See also CH HL and CH GO Page 75 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 2 1 10 9 CH GO CHannel Group alarm Output Where nis an integer that defines the digital output channel number 19 or 20 lt string gt is a string defining on which the analogue channels an alarm check is required The format for lt string gt is PATA2A3 A36 p defines the output state of channel n for alarm detected e p 2 disable alarm checking on channel n e p 1 FET on switch closed i e as MODE 80 e p 0 FET off switch closed i e as MODE 800 An is the identity of an alarm check and consists of an analogue channel number in the range 1 through 18 and the character H o
73. nd stream s The parameter n specifies the number of S Net bytes to be returned from this source Page 21 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 Response 1 4 3 9 Function Response 1 4 3 10 SNET to USB Interface 35954U User Manual The _SR command returns twice the number of bytes requested returned by the interface because of the output format used Except for Stream 3 which uses alphanumeric ASCII characters only The _SB can return up to twice the number of bytes requested as control characters in the range O to Ox1F are transmitted as Ox1F and 0x20 byte The ranges of the values that can be assigned to aa and s are as follows 00 lt aa lt 50 O lt ss3 The value of n see Table 5 2 depends on the stream and the application These commands are particularly useful for reading data from streams 2 and 3 since data in these streams is returned asynchronously An appropriate single read can be put on each IMP and stream after initialization On receipt of any data no more data need be received until the interface has processed the present data and issued another single read For stream test and ascsii read H lt number of bytes gt The data is returned as specified or an error is returned for reception errors See section on output formats _ TI command Time TIDD MM YY
74. nected and the IMPs at either end of the network should each have a terminator fitted 1 2 2 2 Figure 1 2 The 35954U Interface placed between IMPs on the S Net CONTROLLER IMP Interface Unit 1 I I IMP IMP IMP I y IMP IMP IMP IMP 1 2 3 1 4 5 6 7 S Net NIN 1 i eed es eee Jey wuy wus ke lt VY i To further IMPs if required To further IMPs if required S Net terminators should be fitted to the IMPs at either end of the S Net cable Page 8 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 1 2 2 3 1 2 2 1 INSERTING OR REMOVING THE TERMINATOR JUMPER The S Net terminator within the 35954U Interface Unit is connected via an internal jumper To disconnect the terminator you simply remove the jumper The configurations which decide whether or not the terminator is to be connected are described on the previous page The procedure for accessing the terminator jumper is as follows 1 Remove and retain the 4 screws from the rear panel where the S Net and Power Connections are located of the Interface 2 With care slowly slide out the panel You do not need to remove the panel from the housing completely 3 Inthe top right hand corner you will see the jumper See Fig 1 3 for assistance To remove the jumper simply l
75. ntation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 2 1 7 3 IN INitialise strain gauge parameters Re Where nis an integer that defines the channel number in the range 1 lt ns 10 Note This command applies only to IMP type 1B with strain gauge s Function Before a strain gauge channel can be used the IMP must first know the initial voltage of a gauge connected to a specified channel to store this and also transmit this data to the PC The IMP must then be informed of the gauge factor using the CH GA command The IMP uses these parameters to calculate strain results and unless the IMP holds these parameters it will return the error strain gauge not initialised when commanded to measure The PC should be programmed to store the strain gauge data as a string and later if necessary send it back to the IMP using the LO or CH OF commands This allows a re start after the IMP has been powered down Response Stream 1 8 bytes oooo out of balance voltage represented by 4 bytes rrrr initial gauge voltage represented by 4 bytes See also CH GA CH OF SA and LO Page 59 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 2 1 8 COMMANDS FOR DIGITAL MEASUREMENTS ONLY 2 1 8 1 CH
76. nterface 35954U User Manual 2 1 7 COMMANDS FOR STRAIN GAUGE MEASUREMENTS 2 1 7 1 CH GA set CHannel GAuge factor Where nis an integer that defines the channel number in the range 1 lt n lt 10 gis an IEEE 754 floating point number defining the strain gauge factor Note This command applies only to IMP type 1B with strain gauge s Function Loads the IMP database with the gauge factor required for a specified channel A strain gauge channel can t perform measurements until it has been INitialised and the gauge factor sent to the IMP Response None See also IN CH OF LO and SA Where nis an integer that defines the channel number in the range 1 lt ns 10 o is an IEEE 754 floating point number defining the offset in volts p is an IEEE 754 floating point number defining the initial gauge voltage Note This command applies only to IMP type 1B with strain gauge s Function Sets the strain gauge offset and initial voltage values used by an IMP to calculate strain results These values will have been returned by the INitialise command and should be stored in the PC After an IMP has been powered down this command can be used to set up a strain gauge channel to the original condition set by the previous IN command This must be used in conjunction with the CH GA command before the strain gauge can return data Response None Page 58 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Docume
77. overwritten and the most recent results are discarded For more information in buffering refer to part 1 of this manual As TRigger subsequent scans are loaded into the IMP output buffer as previous scans are accepted by the PC TR AR SP and RM DI Disarm This command does not apply to type 1D IMP devices Cancels the ARm command None AR Page 41 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 2 1 4 5 Note Function Response Note Function Response See also SNET to USB Interface 35954U User Manual HA Halt This command does not apply to type 1D IMP devices Cancels the continuous measurement mode If an IMP is making measurements when the HA command is received it completes the scan and sends the results to the PC before halting If no measurements are made the IMP halts immediately The HA command does not alter the scan period set with the SP command Stream 3 Single character H confirms that measurement has stopped LO Load set up data to IMP ci s is the database e 1 2 or 3 for IMP types 1A 1B 1C 1E 2A and 2B and e 1 2 3 7 for the Universal IMP UIMP types 1H and 1J d1 d2 dn are n data bytes where n is dependent on the IMP type and on the database This command does not apply to type 1D IMP devices Loads previously SA
78. parameters in several IMP commands To represent a number in IEEE 754 format four bytes are used 4 First Byie gt lt Fourth Byte gt L Implied 1 of mantissa Fractional part of mantissa Binary exponent with excess of 127 m most significant e most significant L Sign bit most significant bit of first byte The S sign bit is one if the number is negative and zero if the number is positive The binary exponent has an excess of 12719 This means that it consists of the sum of the true exponent with 12710 This allows a range of exponent values form 12710 to 12810 To retrieve the true exponent subtract 12710 The mantissa has an implied one Only the fractional part of the mantissa is actually written When the number is converted to IEEE format the exponent is adjusted until there is only a single binary one to the left of the binary zero This binary one is then omitted and becomes implied Example To convert a decimal number of 2 25 2 2519 10 012 10 01 2 1 001 2 Mantissa with implied 1 001 Exponent 1 With excess of 127 127 1 128 This gives the result o 1000000 o 0010000 00000000 00000000 The result breaks down into Sign bit 0 there fore the number is positive An exponent with the excess of 12710 100000002 12810 the true binary exponent is 110 Mantissa with implied 1 001 a true mantissa of 1 0012 Th
79. r Analogue and Digital Measurements Commands for Analogue Measurements Only Commands for Thermocouple Measurements Commands for Strain Gauge Measurements Commands for Digital Measurements Only Commands for Analogue Outputs Additional Commands for the Universal IMP In each section commands appear in alphabetical order Each command description is headed with the command code and the command title in brackets For example CH MO set CHannel MOde The command syntax is shown by a flow diagram which includes any command variables For example ee Where nis an integer that defines the channel number in the range 1 lt n lt 20 for IMP types 3595 1A 1C 1E 1H 1J and 2A in the range 1 lt n lt 10 for IMP type 3595 1B and in the range 1 lt n lt 32 for IMP type 3595 2B mis a 3 digit code which defines the channel mode Note that the command codes are shown in bold UPPER CASE characters and variables in lower case Italics Only the items in boxes form part of the command string A description of each command variable and the variable limits appear under the flow diagram as illustrated above Following the flow diagram the following information is given Note Detailing specific IMP devices when appropriate Function Description of command function Response What the IMP transmits to the PC in response to the command See also Other related commands In some cases an example of use is also given Page 32 of 98
80. r L The H specifies a high limit alarm check See CH HL L specifies the low limit alarm check See CH LL Function Defines the group of alarms to be associated with a digital output If any of the alarms are active OR logic the digital output will be active Only the channels specified in the last CH GO command are checked The CH GO command provides for alarm checking on all 18 analogue channels Checking is against the high and low limits defined by the CH HL and CH LL commands On all analogue channels it is possible to specify a high limit alarm check or a low limit alarm check or both Specifying both alarm limit checks is equivalent to specifying an out of window check Note that it is not possible to specify an in window check by specifying a high limit that is less than the low limit See also CH HL and CH LL Notes 1 2 If n 20 Watchdogs are disabled Alarm checking operates only for scanned channels NOT for single measurements The CH GO command stays in operation unless a it is overridden by a CH MO command or b another CH GO command is received or c the Watchdog is enabled channel 20 only This command sets the MOde database to MO80x where x the Go state for the channel The state of the digital output may be read at any time by measuring or scanning the channel The group may consist of one alarm element only If p 2 no alarms need be specified ala
81. r the specific device options based on H8S 2398F using Protocol B PACE Indi Istria cd Select the external clock or the External Clock Display internal clock J Device Irnage I Target files Enter the CPU crystal frequency eran Mhz 3 LCP mot for the selected device E Keyboard 15 Comme met Enter the clock mode for the No NE z ge selected device Device Image Ea Target Fes Select the multiplier f i E i plier for the Main 1 tag cOntverff pe clock frequency CKM Data mot Algorithm Select the multiplier for the Peripheral clock frequency CKP lt Back Cancel Page 96 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual Next please select BOOT Mode and uncheck the Use Default option for the recommended speed From the drop down list select 19200 as shown below and click Next Connection Type b k Space 1A T EP Display Bea tage ne r lles iS LCD mot S Keyboard S Comms mot dustrial c Device Image ae Target files fe Drive mot Fee aka not 3 Algorithm The FLASH Development Toolkit can connect to your device in a number of different ways All the options on this page may be changed after the Project has been created Select Connection BOOT Mode C USER Program
82. rd of the number of events that have occurred since an initial ME or TR command It can only be cleared by a power down or the CL command Maximum count value 16 777 215 Page 61 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual Response None Page 62 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 2 1 8 4 Where Note Function Response See also 2 1 8 5 Note Function Response See also SNET to USB Interface 35954U User Manual EV enable EVent capture e 0 stop event capture e 1 enable event capture This command applies only to the digital IMP types 2A and 2B Enables event capture on any channels in the IMP already set to event capture mode Event capture can be enabled or stopped only by this command TRigger ARm or MEeasure commands have no effect on event capture Event data is sent to stream 2 For a detailed explanation on event result formats see Chapter 2 CH MO and ES ES Event Status This command applies only to digital IMP types 2A and 2B This command checks the configuration for channels selected for event capture and for each one inserts an event status result with ti
83. rm checking is disabled for all alarms previously specified Page 76 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 6 On alarm the defined digital output is active Active can be defined as switch closed or switch open depending on the value of p in the command string This gives the option of an active alarm when the IMP is non functional Consider a requirement to disable a machine when off limit readings are obtained for oil temperature oil pressure or both or monitoring equipment is non functional The oil temperature should be in the range 10 to 95 C The oil pressure should be in the range 1 to 3bar The channel definitions for this scenario could be a Minimum acceptable oil temperature on channel 1 low limit CH1LL 10 b Maximum acceptable oil temperature on channel 1 high limit CH1HL95 c Minimum acceptable oil pressure on channel 2 low limit CH2LL1 d Maximum acceptable oil pressure on channel 2 high limit CH2HL3 e Define channel 19 associated with the above alarm group CH19GO001L01H02L02H Note that alarms use data post unit conversion or post linearisation While the IMP is powered down the digital output is open thus disabling the machine When the IMP first powers up the machine remains disabled When CH19GO command is sent
84. rovide sufficient output smoothing It is important that external power supply is able to supply maximum current on short circuit without folding back Foldback is performed by the 35954U unit itself A suitable supply is the 48V System PSU 1 3 3 CABLE SELECTION Cable selection depends on two cable characteristics 1 The a c attenuation of the cable This affects the digital communications running back and forth along the cable between the IMPs and the Interface There are two specific points to consider a The high a c attenuation of the 24 AWG cable means that S Nets using this cable cannot be longer than 660 meters b The low a c attenuation of the 14 and 18 AWG cables means that the S Nets using these cables cane be extended up to 1 5km The large diameter of these cables necessitates special consideration when making connections to the IMP For details see the IMP Installation Guide 2 Thed c resistance of the cable This and the voltage of the power supply determines the maximum number of IMPs that can be powered via the cable Generally if any IMPs on the network are powered from the Interface via the S Net cable it is important that a cable of adequate gage is used The optimum cable size depends on the number of IMPs to be powered via the S Net cable the cable length required and the power supply voltage Information on choosing the cable either for power provided internally from the interface or from an external
85. rror code OxFF8D measurement pending for all scans until a result is available When the measurement is complete the result is returned in the next scan e Fora single scan the results are not returned until the measurement is complete EXAMPLE 1 Assume that the measured input is a 20Hz nom square wave and that mode 902 has been selected This means that the frequency of the square wave is to be measured for 1 second the gate time For continuous scanning with a scan period of 100ms error code OxFF8D is returned in place of each of the first nine results On the tenth scan a valid measurement result 20Hz is returned This sequence is repeated whilst continuous scanning is in operation For a single scan the result 20Hz is returned on completion of the one second 1s gate time 2 Assume that the measured input is a 200Hz nom square wave and that mode 901 has been selected This means that the frequency of the square wave is to be measured for 100ms For continuous scanning with a scan period of 100ms a valid measurement result 200HZ is returned for each scan For continuous scanning with a scan period of 1s a valid measurement result of the same accuracy is returned every second For a single scan the result 200HZ is returned on completion of the 100ms gate time Page 40 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 do
86. rs Stream 3 data which consists normally of ASCII characters is sent as received Error status data from the interface consists of an error status number plus additional information in accordance with the circumstances When data is requested from Streams 0 1 and 2 twice the number of requested bytes are actually received This is because the four byte IEEE measurement data read from the IMPs are converted by the interface to eight byte ASCII IEEE format In fact any byte received from these three streams is converted to the two byte ASCII hex equivalent e g 8AH is converted to 38H 65H which are the ASCII codes for the characters 8 and A The reason for this conversion is that the bytes sent by an IMP could if relayed without conversion to the serial and USB ports be misinterpreted as ASCII control characters e g ODH carriage return and 3H Xoff 1 4 4 1 S NET MEASUREMENT STATUS FORMAT The first line of the message contains the header identifier H IMP address aa and the stream number s Subsequent lines contain the results with each line containing up to eighty bytes ten results isaa lt terminator s gt b0 b1 b2 b3 b4 b5 b6 b7 bn lt terminator s gt b0 b1 b2 b3 b4 b5 b6 b7 bn lt terminator s gt where i H for header identifier s stream number aa 01 to 50 for IMP address b0 bn bytes of up to ten results Page 24 of 98 Workin
87. s command resets previous settings sets channel n to volts dc 2V range and tells the IMP to take a measurement on channel n On an IMP other than the UIMP channel n can be any channel on the UIMP channel n can be any channel from 1 through 18 RE CHnMO902 MEn For digital IMP and Universal IMP This command resets previous settings sets channel n to frequency measurement gate time 1 second and then tells the IMP to take a measurement on channel n On an IMP other than the UIMP channel n can be any channel on the UIMP channel n can be any channel from 19 or channel 20 SE CO TR For any IMP This command sets every IMP all channels to either volts dc auto ranging analogue IMP or digital status digital or switch IMP and enables measurements enables continuous measurement scanning and then starts the scanning measuring on all channels Scans will continue being until the buffers available are full or until the HA halt command is issued Examples a and b can be extended to setting up every channel on an IMP and begin scanning To do this use CH MO entry in the Command Directory to decide the required function for each channel The string together all the appropriate CH MO commands one for each channel As an example IMP type 1A would have twenty CH MO commands sent to it in order to configure every channel RE CH1M0O100 CH2MO500 CH20MO310 AR TR RE CH1MO600
88. scans are started at the beginning of each scan period unless the system runs out of output buffers in which case scan alignment will be lost Page 50 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V 1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 2 1 4 12 ST STatus Function Instructs the IMP to respond with information on type of IMP connector block and firmware fitted Response Stream 3 12 characters ee a Where XX IMP code indicates IMP type See Table 2 11 b Connector block code indicates connector block type See Table 2 12 c Bit function depends on the type of IMP For the 35951D Analogue Output IMP c indicates the minimum output current 0 for OA or 4 for 4mA For all other IMP types cis set to A if the IMP is capable of responding to a SP command r binary counter of the number of communication retries f If f F the IMP is capable of responding to an FRO or FR1 command nnyz The software number status and issue The software numbers are related to the IMP type and are listed in Table 2 11 Example A response of 1CDA F 03FB indicates a 3595 1G reed relay thermocouple IMP with a 3595 3D attenuator connector block and firmware version 03FB The IMP can respond both to the SP command and to the FR command Table 2 11 IMP Codes IMP Code Soft
89. st significant bit of first byte All numbers are in binary coded decimal X4 months tens X3 X0 months units D7 D4 days tens D3 Do days units H7 H4 hours tens H3 Ho hours units M7 M4 minutes tens M3 Mo minutes units 2 2 4 2 EVENT TAG FORMAT An event tag contains the channel number direction of transition calendar seconds and calendar milliseconds in the following format 4 First Byte gt lt Fourth Byte gt most significant bit of first byte T transitions if T 1 event is positive going low to high if T 0 event is negative going high to low C4 Co channel number in binary C4 is most significant Note Channel numbers entered for the 3595 2A IMP correspond exactly with the physical channels 1 Channel 1 2 Channel 2 etc With the 3595 2B IMP however channel numbers 0 through 31 represent the physical channels 1 through 32 All remaining numbers are in binary coded decimal 7 S4 seconds tens 3 S9 seconds units Page 87 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual R4 R7 milliseconds hundreds R3 R o milliseconds tens P7 P4 milliseconds units 2 2 4 3 EVENT STATUS FORMAT Event status information is similar to that contained in an event flag The only difference is that t
90. stored in a 4 byte result and loaded into the output buffer when space is available Up to 65535 lost events can be counted Event data transmitted by an IMP can consist of a number of bookmarks event tags ad one end tag Only a single bookmark is sent per calendar minute and this is only if an event occurs A bookmark gives the most significant calendar data for all event tags sent after it until the next bookmark is sent If event data is sent to a free buffer on the 4C Interface card data for the only one result is sent this consists of a bookmark an event tag and an end tag Subsequent data is sent only if the application software reads the initial data The IMP whilst waiting for the buffer to become free stores any new event tags and bookmarks This new data is sent when the buffer is free An end tag is added if the stream of event data is less than 112 bytes long but this tag can be replaced by a lost event tag if one has to be sent Event status responses also go into Stream 2 In this case the event tag is replaced by the event status format Page 86 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 2 2 4 1 BOOKMARK FORMAT A bookmark contains the calendar month day hour and minute in the following format 4 First Byte gt Fourth Byte gt o
91. t fitted with Autoscan firmware will ignore the SP command 2 IMP types that have the Autoscan firmware are 3595 1A 3595 51A 3595 1B 3595 51B 3595 1C 3595 51C 3595 2A 3595 52A 3595 1E 3595 51E 3595 2B 3595 52B 3595 1H 3595 1J Mod Mod Mod Mod Mod Mod Mod Mod Strikes C13 A9 Strikes C17 10 Strikes C16 A9 Strikes B12 A10 Strikes A1 Strikes A1 Strikes A1 Strikes A1 3 IMP devices that may be fitted retrospectively with the Autoscan firmware are 35952A 359552A Mod Mod Strike B11 Issue X Strike A9 Issue X 4 All IMP interfaces must be fitted with the correct issue of firmware that is firmware to issue AE The type 4B and types 9A 9B 9D will always have the correct issue of firmware fitted Page 48 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual Example An example of a command string in IMPVIEW using the SP command is AR SP 100 CO TR Where AR arms the IMP SP 100 sets a scan period of 100ms CO enables the continuous mod and TR triggers the IMP This command string instructs the IMP to scan all channels of the IMP continuously every 100ms SCAN SYNCHRONISATION OF THE 1H AND 1J IMP TYPES To make it possible for scans to be synchronised the 1H and 1J IMP types are able to delay the start of a scan from t
92. t up data to be quickly reloaded into an IMP database The general procedure for storing and loading an IMP database is 1 Stop all measurements in progress by the IMP 2 Read all data available 3 Send a SA command 4 Store the next stream 0 response from the IMP 5 Repeat steps 3 and 4 for each database to be saved 6 Power down and if required disconnect the IMP 7 Power up and if required reconnect the IMP 8 Send the following string to the IMP LOn bytes originally returned by SAn command 9 Repeat step 8 for each database to be loaded into the IMP Stream 0 n bytes of data Page 45 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual See also SD and RD Table 2 8 Database bytes 1A 1B 1C 1E 2A and 2B IMP types IMP Type No of bytes in No of bytes in No of bytes in Database 1 Database 2 Database 3 1A 1C amp 1E Thermocouple 11 63 80 1B Strain 6 163 80 1A Digital 2 100 80 2B Switch 2 97 80 Table 2 9 Database bytes 1H and 1J IMP types Number of bytes in Database Dn MR TYDE D1 D2 D3 D4 D5 D6 D7 1H and 1J Universal 12 86 165 146 182 180 180 2 1 4 10 SE SEt up to test condition and arm Note This command does not apply to type 1D IMP devices Function Quick set up of most IMP devices in the system
93. ta STRAIN GAUGE SET UP if applicable see opposite page Use SA command to save set up data IMP configuration to Host PC Use RD command Restores database on 3595 IMP types tHand 1J 3595 IMP TYPE 2A and 2B Use EV command to enable event logging 3595 IMP TYPE 2A ONLY Use CL command to clear totalise counters oo AS 1 3595 IMP types Use AR command to enable measurements 1H and 1J starts automatically S next IMP BASIC MEASUREMENT Use the CO and TR commands or SP CO Use TR command to take and TR commands to measurement on all channels take continuous measurements NOT 3595 IMP TYPE 2B Use ME command to take measurement on one channel Read scans As Use HA command to stop continuous measurements repeat measurement s Use DI command to disable measurements Figure 2 5 Set up and basic measurement Page 81 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V 1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 2 1 11 2 IMP SPECIFIC SET UP This procedure may be omitted if only default values are to be used ANALOGUE MEASUREMENT IMP IMP TYPES 3595 2A ONLY Use FR command to set the integration time Use UN command to set temperature units Use FR command to set the sample rate on each channel next channel IMP TYPES 3595
94. te gt ost significant bit of first byte Page 89 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 2 2 5 TIME TAG FORMATS FOR 3595 1H AND 1J IMPS With the result format set to time tag results from the 3595 1H and 1J IMP types are returned with a bookmark and time tag appended These appear at the end of each scan and at the end of each single measurement The formats of the bookmark and time tag are in Sections 3 5 1 and 3 5 2 2 2 5 1 BOOKMARK FORMAT A bookmark contains the calendar month day hour and minute The format is 4 First Byte gt Fourth Byte gt DE most significant bit of first byte All numbers are in binary coded decimal X4 months tens X3 X0 months units D7 D4 days tens D3 Do days units H7 H4 hours tens H3 Ho hours units Mz7 M4 minutes tens M3 Mo minutes units 2 2 5 2 TIME TAG FORMAT The time tag contains the calendar seconds and milliseconds in the following format 4 First Byte gt Fourth Byte most significant bit of first byte X5 X0 don t care All remaining numbers are in binary coded decimal S7 S4 seconds tens 3 S9 seconds units R4 R7 milliseconds hundreds R3 R o milliseconds tens Page 90 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0
95. tion Response See also nis an integer that defines the channel number in the range 1 lt n lt 4 X is the output current amps in 4 byte floating point format e inthe range 0 000 lt x lt 0 02 or e inthe range 0 004 lt x lt 0 02 if the split pad on the converter block is made See the IMP Installation Guide This command applies only to IMP type 1D Sets the specified channel to the specified current in amps None OS Page 66 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual Where nis an integer that defines the channel number in the range 1 lt n lt s4 X the measured voltage value corresponding to an non calibrated OV output y the measured voltage value corresponding to an non calibrated 10V output Values x and y are both in volts in floating point format Note This command applies only to an IMP type 1D with a 3595 3Y connector block Function Allows voltage calibration of a specific output channel This should normally be left to users with specialist reference equipment Response Stream 3 4 characters CnVe where nis the channel number and e represents the calibration response as shown in Table 2 18 Equipment The calibration equipment required for IMP type 1D is a An analogue output connector block P N 359
96. tions Page 79 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 2 1 11 SUGGESTED COMMAND PROCEDURES Before an Imp can take a measurement it must first be assigned a task and enabled set up Only then can an IMP be instructed to take a measurement Each result must then be read otherwise buffer space will be filled until the IMP no longer has room to store new data and measurements will stop The command language used by the IMP is very versatile allowing great flexibility in the way each channel can be configured and used To assist in preparing a software application suggested command procedures are outlined overleaf The detailed function and syntax of each command is documented in the Command Directory Once familiar with commands procedures can be tailored to suit a particular requirement Page 80 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 2 1 11 1 SET UP START Use LO command to configure IMP with previously stored set up data including initial strain gauge data ont shone rere IMP SPECIFIC SET UP See ite previously stored set up danii data including initial strain gauge da
97. twenty User Unit Conversion A simple first order conversion of the measurement unit resulting from CHannel MOde to required unit User Linearisation A fifth order linearisation from the measurement unit resulting from CHannel MOde to required unit Real time Mode An IMP outputs data in this standard mode The messages are streamed and real time results appear without a timestamp in Stream 0 For IMP types 1A 1B 1C 1D 1E 2A and 2B this is the only mode available The same mode can also be selected for IMP types 1H and 1J but there are two additional modes available time tag mode and historical mode See below Time Tag Mode Same as real time mode with an extended Stream 0 that includes a time tag Historical Mode This mode is unique to IMP types 1H and 1J and does not use Streams 0 and 1 Stream 2 is enlarged to fill the first 240 bytes of the receive page All results alarms etc from the IMP are passed through with a timestamp This mode must be used if buffering of IMP data during S Net downtime is required Stream 3 is preserved to return status and error information Do not use the SA command while in continuous historical mode since this command uses Stream 0 and overlaps the same data space on the 3595 4C Interface card Logic States When channels 19 and 20 are used for digital status inputs the logic states recognised are e logic 1 switch open off high impedance e logic 0 switch closed on
98. twork terminator on interface unit 24 48VDC power supply not included P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Page 2 of 98 Working copy if printed Version 1 0 0 0 SNET to USB Interface 35954U User Manual 1 Part 1 1 1 Chapter 1 Introduction to 35954U Interface 1 1 1 THE INTERFACE The 35954U Interface is operable with any host computer that is fitted with a USB compatible interface The Interface allows the host to communicate with a maximum of 50 IMPs via an S Net cable The Interface provides all the hardware timing control error checking and data protocol necessary for reliable communication between the host computer and the S Net system 1 1 1 1 The 35954U Interface Page 3 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 1 1 1 2 Front Panel 1 1 1 3 Rear Panel Page 4 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V 1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 1 1 2 SNET to USB Interface 35954U User Manual THE MANUAL This manual explains how to install and operate the 35954U Interface Part 1 of the manual relates to the Interface itself Chapter 1 Chapter
99. uide 504 Current dc 100mA Page 34 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 Table 2 4 Mode codes for IMP type 1B Strain SNET to USB Interface 35954U User Manual Code m Mode Set Comments 000 Skip 100 Volts dc auto ranging 101 Volts dc 20mV range There is no 10V range 102 Volts dc 200mV range 103 Volts dc 2V range Resistance 4 terminal 200 0 8mA drive auto ranging 201 0 8mA drive 250 range 202 0 8mA drive 2500 range 203 0 8mA drive 2k5Q range Resistance 3 terminal 210 0 8mA drive auto ranging Only an IMP with a product status of 211 0 8mA drive 250 range C6 or higher are able to comply with 212 0 8mA drive 2500 range an auto ranging command 213 0 8mA drive 2k5Q range RTD PRT 100Q 4 terminal 400 auto ranging 411 20mV range 412 200mV range 413 2V range RTD PRT 100Q 3 terminal 410 auto ranging Only an IMP with a product status of 411 20mV range C6 or higher are able to comply with 412 200mV range an auto ranging command 413 2V range Strain Gauges 600 603 2 bridge 4mA dual current 610 613 bridge 0 8mA dual current The last digit in the code sets the 620 623 bridge 4mA dual current range 630 633 74 bridge 0 8mA dual current 0 auto ranging 640 643 Full bridge 8mA drive 1 200mV range 650 653 Full bridg
100. uire one or more numbers to further specify the command For example the _ lA command must be specified with an IMP address Unless noted otherwise in the command directory these numbers are ASCII keyboard characters and not numeric variables For example I_IA15 Values for parameters such as gauge factors and offsets should be sent in ASCII decimal format or ASCII HEX IEEE format The ASCII decimal values must be enclosed in single quotes and the ASCII hex must also be preceded with a dollar sign or an ampersand amp e g 2 25 40A00000 amp 40A00000 In the above example the ASCII hexadecimal numbers i e 40A00000 amp 40A00000 are in the compressible format mentioned in Section 1 1 Binary information should be sent in ASCII Hex format enclosed in single quotes and preceded with a or NRE Page 16 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 1 4 1 4 EXAMPLES OF COMMAND STRINGS A command string which consists of a sequence of two or more commands can be sent by inserting semi colons between individual commands Each command is then executed in turn by the interface Each complete transmission should not exceed 256 characters in length including semi colons Two examples of useful command sequences are a Fetch st
101. ummarised in Table 1 1 Details of the commands are given in Section 1 3 1 4 2 1 Table 1 1 Interface Command Summary Command Purpose _lAaa Specifies the address of the IMP to be commanded IIN Initializes the interface and applies power to S Net _IP Initializes the interface with a polling table and applies power to S Net PO Shuts down the interface and switches off power to S Net IPS Returns the product serial number in hex l_SRaasn Reads a single data block from IMP aa stream s as ASCII _ TIDD MM YY hh mm ss th _ TI Loads the time and date Requests a time readout Page 18 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 1 4 3 COMMAND DIRECTORY In this directory the commands appear in alphabetical order Each command description is headed with the command code and the command title in brackets e g SR Stream Read The command syntax is shown by a flow diagram which includes any command variables e g aa is the IMP address s is the stream number n is the number of S Net bytes to be returned from stream s at IMP address aa Note that command codes are shown in upper case characters and variables in lower case Only the items in the box form part of the command string A description of each command variable and its
102. ved set up information into the database of the IMP This allows the same channel configurations and values to be used after an IMP is powered down None SA and for 1H and 1J IMP types SA and RD Page 42 of 98 Working copy if printed P iIDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 2 1 4 7 Where Note Function Response See also SNET to USB Interface 35954U User Manual ME MEasure a channel a ee nis an integer which defines the channel number e inthe range 1 lt n lt 20 for IMP types 1A 1C 1H 1J and 2A or e inthe range 1 lt n lt 10 for IMP types 1D or 2B This command does not apply to type 1D IMP devices Instructions an IMP to take a single measurement on a specified channel On IMP types other than the 1H and 1J the channels set for event capture skip or digital output are not affected by this command but returns the error message not measured instead However the digital channels 19 and 20 on the 1J and 1H IMP types when set for digital output respond to a ME command by returning the present status MEasure starts the counting on a single channel set to event count increment or event count totalise provided that counting has not already started An initial result of zero is then returned If counting has already started the result returned is the number of events the IMP
103. ware No Software IMP Xx mm IMP Type Part Number 1A 01 Solid State thermocouple 3595 1A 1B 02 Strain Gauge 3595 1B 1C 03 Reed Relay thermocouple 3595 1C 1D 11 Analogue Output 3595 1D 1E 25 500V Reed Relay thermocouple 3595 1E 1H 30 Universal IMP 200V ch ch isol 3595 1H 2J 30 Universal IMP 500V ch ch isol 3595 1J 2A 04 Digital 3595 2A 2B 18 Switch 3595 2B Page 51 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual Table 2 12 Connector block codes Connect Block Connector Block Type Connector Block P N Code b Standard Block Glanded Block A Thermocouple 3595 3A 3596 3A B Strain Gauge 3595 3B 3596 3B C Digital 3595 3C 3596 3C D Reed Relay Attenuator 3595 3D E Analogue Output 3595 3E F Switch 3595 3F J Universal 3595 3J W Universal Calibration 3595 3W Y Analogue Output Calibration 3595 3Y Z Calibration 3595 3Z Unknown 2 1 4 13 TR TRigger scan Notes This command does not apply to type 1D IMP devices Function Response See also If trigger broadcasting is to be used please read the relevant sub section in Chapter A of the 3595 4A 3595 4B or 3595 9A 9B 9D Operating Manual before implementation Instructs an ARmed IMP to make a measurement scan An IMP must already be ARmed to respond If CO has already be
104. xternal 43V 50V dc power supply connected to the external power plug on the Interface again via the S Net cable The location and the pin numbering of this external power plug are shown in Chapter 3 Electrical Installation of the 35954U Interface This method allows up to 50 IMPs to be operated with a maximum cable length of 1km See Section 4 3 2 in present chapter Cable Selection When Using the Interface External Supply 3 Directly from a power supply local to the IMP s For 3596 Intrinsically Safe IMPs this is the only method of providing power For further information refer to the 3595 or 3596 Series IMP Installation Guides Page 12 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 1 3 2 1 1 3 2 1 EXTERNAL POWER SUPPLY REQUIREMENTS Operation is automatically switched to the external supply when a voltage over 43V is applied to the external power plug on the Interface An external power source must fulfil the following requirements a Current limited to 3A 4A or protected by a 4A fuse b Voltage 43V 50V This depends on the wire gage the cable length and the number of IMPs connected to the cable c Supply ripple less than 100m V rms It is permissible for a battery operated S Net system to have a charger permanently connected Batteries generally p
105. ytes appended in the time tagged and historical modes are described in Sections 3 5 and 3 6 The error messages that may be returned by an IMP are listed in Section 3 7 together with their meanings Table 3 1 IMP Result Formats IMP Result Stream Format Scan data of all measurements except event totalise and event increment Scan data of event totalise and event increment measurements Single measurement Events capture From 3595 2A and 2B IMP types only IMP status and Command responses Response to a SA SAve set up data command 0 4 byte floating point number 0 IEEE 754 floating point number 1 4 byte floating point number 2 Event capture results are returned in the form of bookmarks event tags event status end tags and lost events Each of these has an individual format which is described in Section 3 4 3 ASCII characters 0 Command format See Chapter 2 IMP Commands Page 83 of 98 Working copy if printed P iDAS_makediscs 22 IDAS IMP 4 0 0 incUSB Documentation 35954U User Manual V1 2 doc docx Measuresoft Development Ltd Version 1 0 0 0 SNET to USB Interface 35954U User Manual 2 2 2 IEEE 754 FLOATING POINT NUMBER FORMAT The IEEE 754 floating number format is used for the event totalise and event increment results as returned by the 3595 IMP types 2A and 2B It is also used for the response to the IN command and for the set up
106. z x i Halts all measurements i LO x 2 A x z Loads saved set up information ME j id Takes a single measurement RE i y i j i i Sets all IMP settings to default SA i is i a z Store set up data SE K ii a i ki j S Quick set up of all IMPS E SP j i i i Set scan period ST E j h id Request information on IMP 2 TR i s 3 si i s Request data from armed IMP i CA i i 2 ij n Calibration on specific ranges 3 2 DR y i y For test purposes only FR ig i i i i S Sets the integration time 3 KA hi i j i s 7 J Calibrate ON UN i 4 iy Selects units of Temperature AM i j i ig C Ambient temperature reference 3 3 TE iy iy z Sets reference temperature TC j ij 7 Sets thermocouple check for o c CH GA a Loads IMP with gauge factor 3 4 CH OF h Sets the strain gauge offset E IN i Sets strain gauge parameters CH RA i y y Sets the sample rate 3 4 CH TI bi i Sets the time out period CL j bj Clear event totalling counter EV Enables event capture j ES x Event status 7 HW h s Enable Disable hardware w dog ij SF Status format IEEE compressed 5 SW i is Enable Disable software w dog i CH VO Sets channel to voltage 3 6 CH IO i Sets channel to current CH CV 3 Calibrates voltage channel i CH Cl y Calibrates current channel j OS Request info on o p channels Abbreviations used w dog watchdog o c

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