Appendix A
DVP-MC operating manual A-9
Field name Field character
ASCII code corresponding to field
character
“0” 30
“0” 30
“0” 30
Data number (Counted by
words): 2
“2” 32
“E” 45
LRC check code: 0xEA
“A” 41
End character 1: LF
CR 0D
End character 0: CR
LF 0A
Communication in RTU mode
1. Communication data structure
Start No input data for more than 10ms
Communication address Slave address: 8-bit binary address
Function code Function code: 8-bit binary address
Data(n-1)
…….
Data 0
Data content
n × 8 bit binary data, n<=202
Low byte of CRC check
High byte of CRC check
CRC check sum
CRC check sum is composed of two 8-bit binary data
End No input data for more than 10ms
2. Communication address
The valid communication address is 0~254. The communication address 0 indicates to broadcast the
message to all slaves and the slaves which have received the broadcast message do not make any
response. If the communication address is not 0, slaves will reply to master as normal. For example, to
communication with the slave with the communication address of 16, the address of the slave is set as
0x10 since decimal 16 is equal to hexadecimal 10.
3. Function code and data
The data format is determined by function codes. For example, to read the data of two continuous
addresses with 0x1000 as start address in DVP10MC11T, the address of DVP10MC11T is 1, 0x1000 is the
Modbus address of D0 in DVP10MC11T PLC.
The data in the communication cable and the explanation on them are shown below:
PC→DVP10MC11T: “01 03 10 00 00 02 C0 CB”
DVP10MC11T→PC: “01 03 04 01 00 02 00 FA AF”
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