Delta D25886 User Manual Page 283

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Appendix A
A-20 DVP-MC operating manual
Function code: 0x02 to read bit-device register value
The data structure of function code of 0x01 is the same as that of 0x02. So 0x01will not be introduced
additionally. When COM2 is possessed by PLC in DVP10MC11T, the input point status can not be read via
0x01 function code.
Data structure of request message:
Data order Name Byte
Byte0 Modbus ID Single byte
Byte1 Function code Single byte
Byte2 High byte
Byte3
The start address of DVP10MC11T bit device to be read.
Low byte
Byte4 High byte
Byte5
The number of DVP10MC11T bit device to be read.
Low byte
Byte6 Low byte of CRC check sum Low byte
Byte7 High byte of CRC check sum High byte
Data structure of response message:
Data order Name Byte
Byte0 Modbus ID Single byte
Byte1 Function code Single byte
Byte2 Read byte number of bit device. Single byte
Byte3 Read state value of bit device. Single byte
Read state value of bit device. Single byte
Byte n Read state value of bit device. Single byte
Byte n+1 Low byte of CRC check sum Low byte
Byte n+2 High byte of CRC check sum High byte
Data structure of abnormality response message:
Data order Name Byte
Byte0
Modbus ID
Single byte
Byte1
0x80+ function code
Single byte
Byte2
Abnormality response message
Single byte
Byte3
Low byte of CRC check sum
Low byte
Byte4
High byte of CRC check sum
High byte
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