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COMMERCIAL IN CONFIDENCE

CAL 3300/9300/9400/9500(P)

MODBUS RTU

COMMUNICATIONS GUIDE

September 2000

ISSUE 1.10

Doc:33034 Iss:00

Содержание CALCOMMS 3300

Страница 1: ...COMMERCIAL IN CONFIDENCE CAL 3300 9300 9400 9500 P MODBUS RTU COMMUNICATIONS GUIDE 7th September 2000 ISSUE 1 10 Doc 33034 Iss 002...

Страница 2: ...lers would perform before transmitting the new data out over the bus to the instrument The CAL controllers assume that the values they receive have been checked against limits and are valid no further...

Страница 3: ...ing and should not occur however they will be interpreted as if bit 2 was 0 Bit 4 is used to indicate reserved messages see the section Security Messages below Two types of bit value may exist those w...

Страница 4: ...s linear Also note that while linear input is selected the display of values on the instrument is effected by the setting in DECP not Disp The instrument provides no error checking on values transmitt...

Страница 5: ...wer priority than the displays recorded by the Display Byte If no bit is set the instrument is not in a ramp soak sequence If the unit has finished a ramp but no soak time is specified SOAK bit 2 will...

Страница 6: ...ending on disp selection min LoSc max HiSc Ofst 2 0083 RW 3 6 Degrees 10 LIN normal inc dec see separate details for limits Band 2 0085 RW 3 6 Degrees 10 LIN normal inc dec min 0 1 max 25 of Sensor Ma...

Страница 7: ...1 0190 RW 3 6 No scaling step by 1 min 0 max 100 PL 2 1 0191 RW 3 6 No scaling step by 1 min 0 max 100 SP2 A 1 0192 RW 3 6 0 none 1 dvhi 2 dvlo 3 band 4 fshi 5 fslo 6 cool 9500P 7 EOP SP2 b 1 0193 RW...

Страница 8: ...with degC to decF if required if unit 1 Read hi 2 007A R 3 Read hi 10 LIN Read lo 2 007C R 3 Read lo 10 LIN Data Ct A 2 0432 R 3 CtA 25 Data Ct B 2 0434 R 3 CtB 25 Data Ct 1 2 0436 R 3 Ct1 25 Data Ct...

Страница 9: ...sc Rev 3 1 03E5 RW 3 6 0 3d 1 3r Set 3 2 02E8 RW 3 6 Degrees 10 LIN step 0 1 min 0 0 max 2500 When LIN sensor selected max 9999 Hys 3 2 02EA RW 3 6 Hys3 10 LIN step 0 1 min 0 1 max 100 of HiSc Note Th...

Страница 10: ...ing the enter program mode message causes the push buttons on the instrument to be locked out This feature prevents potentially dangerous conditions arising from simultaneous adjustment of the instrum...

Страница 11: ...n 5 15 4 not used any value may be sent xx 5 not used any value may be sent xx 6 not used any value may be sent xx 7 CRC lo byte 8 CRC hi byte The security byte must be set to 5 prior to this message...

Страница 12: ...is not a valid readable bit an error response code 2 invalid address is returned otherwise the following response is sent Byte No Meaning Value hex 1 Slave address xx 2 ModBus Function code read coil...

Страница 13: ...Starting Address MSB xx 4 Starting Address LSB xx 5 Data MSB xx 6 Data LSB xx 7 CRC lo byte 8 CRC hi byte The normal response is the same as the message An error response code 2 illegal address will b...

Страница 14: ...ceives full message correctly but cannot act on it An error response as detailed under each message heading is returned as follows Byte No Meaning Value 1 Slave address xx 2 Original ModBus Function c...

Страница 15: ...erformed 7 Repeat from step 2 for the next byte of the message until all bytes have been processed 8 The final contents of the CRC register is the CRC value to use 9 When the CRC is placed in the mess...

Страница 16: ...to read the setpoint the various sections of this code would normally be held in separate functions and would be optimised for better speed but this example shows the thought process involved note als...

Страница 17: ...he reply if the Function code is 03 and the CRC is correct The CALController stores the Setpoint internally in 10th degree units so the value can be computed as setpoint reply 3 8 reply 4 10 or in a l...

Страница 18: ...rrectly the whole sequence must be re started from message 1 1st Message byte 0 Slave address xx byte 1 Function code write register 06 hex always byte 2 Register Address high byte 03 hex always byte...

Страница 19: ...ce for the values to take effect 1st Message byte 0 Slave address xx byte 1 Function code write register 06 hex always byte 2 Register Address high byte 03 hex always byte 3 Register Address low byte...

Страница 20: ...D 2 Detailed later dependant on other functions CYC 2 ON OF 0 1 9 9 10 81 Seconds LEVEL 2 Function Values Limits SP1 P 0 100 Read only HAND OFF 1 100 PL1 100 0 PL2 100 0 SP2 A NONE DV HI DV LO BAND FS...

Страница 21: ...LOSC SP LK So set point 1 is adjustable between the current high and low scale settings as long as the setpoint lock is off OFST INPT LIN CYC T ON OF 0 0 to 25 of sensor full scale DECP 0 1 to 81 0 0...

Страница 22: ...DISP 1 0 to 250 0 1 0 to 199 9 If you change SP3 A at any time then the value of SET 3 defaults to zero There are a number of functions which when changed can have an effect on the values of other fun...

Страница 23: ...ting C to F Here is a list of the functions that are effected by a C to F conversion and if a relative or absolute conversion is needed FUNCTION CONVERSION NOTES Set point 1 Absolute HISC Absolute LOS...

Страница 24: ...99 9 400 0 LIN1 0 400 0 0 400 0 LIN2 25 400 25 0 400 0 LIN3 0 3000 0 0 999 9 LIN4 250 3000 199 9 999 9 LIN5 0 3000 0 0 999 9 LIN 9500 0 9999 N A N A TABLE 2 MIN MAX SENSOR FULL SCALE DEGREE F SENSOR M...

Страница 25: ...0 0 400 0 LIN1 0 400 0 0 400 0 LIN2 0 400 0 0 400 0 LIN3 0 3000 0 0 999 9 LIN4 0 3000 0 0 999 9 LIN5 0 3000 0 0 999 9 LIN 9500 0 9999 N A N A TABLE 4 HI SC LO SC DEFAULT SETTINGS DEGREE F SENSOR DEFA...