Appendix A Appendix A Modbus Communication DVP10MC11T Modbus Communication Port: DVP10MC11T covers two communication ports, COM1 and COM2. COM1: COM1 is a RS-232 communication port possessed by PLC module supporting Modbus ASCII or RTU mode. It can serve as Modbus master or slave to upload and download the program, monitor COM2: COM2 is a RS-485 communication port supporting Modbus ASCII or RTU mode and is the PLC device, connect the human machine interface and etc. hardware port shared by motion control module and PLC. Via the port, the motion control module and PLC can be accessed respectively according to their different node addresses.
So the node address of motion control module and PLC must be different when COM2 is used. When COM2 is possessed by PLC module, it could serve as Modbus master or slave. When COM2 is possessed by motion control module, it could only serve as Modbus slave. The Pin definition of DVP10MC11T Modbus communication port: The Pin definition of DVP10MC11T RS-232 （ COM1 ） : The Pin definition of DVP10MC11T RS-485 （ COM2 ） : DVP10MC11T Modbus Communication Port Setting 1. COM1 communication format is set by D1036 and the meaning for each bit of D1036 can be seen in table 1. its communication node adress is determined by D1121.
If the value of D1121 is 1, it indicates that the communication node address of PLC module is 1. The default communication format for COM1: Baud rate=9600bps, Data bits=7, Parity=E, Stop bits=1, Mode=ASCII, Address=1 Note: After COM1 communication format is modified, if RUN/STOP switch of DVP10MC11T turns RUN→STOP, the communication format keeps unchanged.
After COM1 communication format is modified, DVP10MC11T power is switched on from off, COM1 will be restored to the communication format of factory setting DVP-MC operating manual A-1 Pin Signal Description 1, 2 +5V 5V Power positive pole 3 GND Grounding 4 Rx For receiving the data 5 Tx For sending the data 6 GND Grounding 7 NC Reserved Pin Signal Description 1 + Signal+ 2 _ Signal- 3 SG --