The actual value of measurement value of amperage from DES-216-I transducer in mA DC (0 – 20 [mA A20] is obtained from readout
register according to algorithm from paragraph 7.3.1.1 by use appropriate factor value DW=100 (table p.7.3.1.1).
7.3.2. FUNCTION 0X03 / 0X04 - READOUT OF CIRCUIT SERIAL NUMBER FROM MEASURING
CHANNEL [4X / 3X-REFERENCES]
Use function code 0x03 / 0x04 for readout of 1-WIRE circuit serial number from measuring channel.
In case of query not the whole serial number, the module will respond the exception 2 - unknown address data.
The serial number in measuring channel is presented by four 16-bit registers.
Example of the circuit serial number (hex) : 26 10 17 40 01 00 00 23 will be saved in the MODBUS register like in the table below.
Channel
Register
address
(dec)
Hi
Register Contents
Lo
Register Contents
0 400
Byte 0 of serial number
26
Bajt 1 of serial number
10
0 401
Byte 2 of serial number
17
Bajt 3 of serial number
40
0 402
Byte 4 of serial number
01
Bajt 5 of serial number
00
0 403
Byte 6 of serial number
00
Bajt 7 of serial number
23
Query of circuit serial number from channel nr 0 .
Byte no Designation Size Value [hex]
00 Module address 1 Byte
01 [ 01 to F7]
01 Function code 1 Byte
03 / 04
02 Registry address Hi 1 Byte
01
03 Registry address Lo 1 Byte
90
04 Registry number Hi 1 Byte
00
05 Registry number Lo 1 Byte
04
06 CRC-Lo 1 Byte
---
07 CRC-Hi 1 Byte
---
Example. Readout of circuit serila number from measuring channel nr.0 (address 40401 to 40404 / address 30401 to 30404)
01-03-01-90-00-04-CRCLo-CRCHi
01-04-01-90-00-04-CRCLo-CRCHi
Response
Byte no Designation Size Value [hex]
00 Module address 1-Byte
01 [01 to F7]
01 Function code 1-Byte
03 / 04
02 Number of data bytes N-Byte
08 [dependent on query]
03 S/N0-Hi 1-Byte
26
04 S/N1-Lo 1-Byte
10
05 S/N2-Hi 1-Byte
17
06 S/N3-Lo 1-Byte
40
07 S/N4-Hi 1-Byte
01
08 S/N5-Lo 1-Byte
00
09 S/N6-Hi 1-Byte
00
10 S/N7-Lo 1-Byte
23
11 CRC-Lo 1-Byte
---
12 CRC-Hi 1-Byte
---
Example. Readout of circuit serila number from channel nr.0 (address 40401 to 40404 / address 30401 to 30404)
25
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