CEL-MAR ADA-4040PC6, User Manual

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Algorithm 2.Readout register is saved to regular type variable 16-bit (short int) and then divide by the factor DW , received change
of the dividing it is a number of the hundredth parts of the measurement value.
// The fragment of code in C language (VS6.0) presenting above algorithm
short int siMeasurementReg;
div_t div_MeasurmentValue;
......
div_MeasurmentValue= div((int)siMeasurementRegister,
DW )
printf( "Total measurement value = %d\n, Hundredths of measured values= %d\n",
div_MeasurmentValue.quot, div_MeasurmentValue .rem );
8.4.1.2. READOUT TALKER ID FROM 16-BIT REGISTER [4X / 3X-REFERENCES]
0x03 / 0x04 Function are used for readout of converter registers value.
Example query MODBUS-RTU about TALKER ID from NMEA0183 protocol is shown below.
Query about TALKER ID register
Byte no Designation Size Value [hex]
00 Converter address 1 Byte 11 [ 11 do F7]
01 Function code 1 Byte
03 / 04
02 Registry address Hi 1 Byte
00
03 Registry address Lo 1 Byte
00
04 Registry number Hi 1 Byte 00
05 Registry number Lo 1 Byte 01
06 CRC-Lo 1 Byte ---
07 CRC-Hi 1 Byte
---
Example. Query TALKER ID from registry address 40001 / address 30001
11-03-00-00-00-01-CRCLo-CRCHi
11-04-00-00-00-01-CRCLo-CRCHi
Response with TALKER ID value
Byte no Designation Size Value [hex]
00 Converter address 1-Byte
11 [ 11 do F7]
01 Function code 1-Byte
03 / 04
02 Data bytes number N-Byte 02
03 Dane1-Hi 1-Byte 47
04 Dane1-Lo 1-Byte 50
05 CRC-Lo 1-Byte
---
06 CRC-Hi 1-Byte
---
Example. Readout TALKER ID from register address 40001 / address 30001
11-03-02-47-50-CRCLo-CRCHi
11-04-02-47-50-CRCLo-CRCHi
In respond TALKER ID is presented as 2-byte with values (Hex): 0x47, 0x50 ( ASCII : G, P ) .
Response – in case or error
Byte no Designation Size Value [hex]
00 Converter address 1-Byte 11 [ 11 to F7]
01 Function code 1-Byte 83 / 84
02 Error code 1-Byte 01 – unknown function
02 – unknown data address
03 – unknown data value
04 – NMEA0183 device not respond or is faulty
03 CRC-Lo 1-Byte
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ADA-4040PC6