CEL-MAR ADA-DIOC40, User Manual

Page: 14 / 20

Byte no. Description Size Value
06 CRC-Lo 1 Byte ---
07 CRC-Hi 1 Byte ---
Example. Readout of the input status 1 (address x10001 to x10001)
01-02-00-00-00-01-CRCLo-CRCHi
Response
Byte no. Description Size Value
00 Module address 1 Byte 0x01 [1 to 247]
01 Function code 1 Byte 0x02
02 Data bytes number 1 Byte 0x01 [depend on query]
03 Data-1 1 Byte 0x01
04 CRC-Lo 1 Byte ---
05 CRC-Hi 1 Byte ---
Example. Readout of the input status 1 (address x10001 to x10001) input status ON.
01-02-01-01-CRCLo-CRCHi
In the response, status of input 1, is presented as byte with value 0x01, it is equal 0000 0001 binary.
Response - in case of error
Byte no. Description Size Value
00 Module address 1 Byte 0x01 [1 to 247]
01 Function code 1 Byte 0x82
02 Error code 1 Byte
0x01 - unknown function
0x02 - unknown data address
0x03 - unknown data value
0x04 - unknown error occurred while processing the query
03 CRC-Lo 1 Byte ---
04 CRC-Hi 1 Byte ---
6.2.3.3. FUNCTION 0X03 –
READOUT OF HOLDING REGISTERS
Function 0x03 is used to readout of 16 bits holding register.
Query
Byte no. Description Size Value
00 Module address 1 Byte 0x01 [1 to 247]
01 Function code 1 Byte 0x03
02 Register address Hi 1 Byte 0x00
03 Register address Lo 1 Byte 0x00
04 Register number Hi 1 Byte 0x00
05 Register number Lo 1 Byte 0x02
06 CRC-Lo 1 Byte ---
07 CRC-Hi 1 Byte ---
Example. Readout of output and input status (address 40001 to 40002)
01-03-00-00-00-02-CRCLo-CRCHi
Response
Byte no. Description Size Value
00 Module address 1 Byte 0x01 [1 to 247]
01 Function code 1 Byte 0x03
02 Data bytes number 1 Byte 0x04 [depend on query (4)]
03 Data1-Hi 1 Byte 0x00
04 Data1-Lo 1 Byte 0x01
14
ADA-DIOC40