Appendix B Abnormality response message data structure: Note: Suppose the number of the bit device to be read in DVP10MC11T in request message is A (Byte 10, Byte 11), If A is divided by 8 with no remainder, the quotient is B; otherwise, the quotient is B +1. B or B+1 is the Byte number (Byte 8) of bit devices in response message. The low bit （ Byte 9 ） of the state value of the read bit device in response message is the state value of the start address of bit devices in DVP10MC11T. Example: To read the state value of M0~M19 in DVP10MC11T via function code 02 The address of M0 is 0x0800; suppose M7...M0=1000 0001, M15...M8=0001 1000, M19...M16=0110 Request message:
“ 00 00 00 00 00 06 01 02 08 00 00 14” Response message: “00 00 00 00 00 06 01 02 03 81 18 06” Function code: 0x05 to write one single bit-device register value Request message data structure:
B-10 DVP-MC operating manual Data order Name Byte Byte0 Transaction identifier High byte Byte1 Low byte Byte2 Protocol identifier High byte Byte3 Low byte Byte4 Modbus data length High byte Byte5 Low byte Byte6 Modbus ID Single byte Byte7 0x80+ function code Single byte Byte8 Abnormality response code Single byte Data order Name Byte Byte0 Transaction identifier High byte Byte1 Low byte Byte2 Protocol identifier High byte Byte3 Low byte Byte4 Modbus data length High byte Byte5 Low byte Byte6 Modbus ID Single byte Byte7 Function code Single byte Byte8 Modbus address of the bit device High byte Byte9 Low byte