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Delta PLC and Raspberry pi 3 communication with RS485


  • How to communicate RPi and Delta PLC by using RS485 modbus. Raspberry pi should act as slave and PLC as master. Need to receive all available data on PLC to Raspberry pi (either C or python script)?? Any help would be great appreciate.


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  • Hi Prathibha,

    Currently Modbus doesn't support being a serial slave. It's something we'd like to do at some point, but haven't yet. If you have a serial to ethernet bridge you can use the Modbus IP publisher for this purpose.


  • I'm using Delta PLC, it doesn't have Ethernet port. Only Modbus RS485 is used for communication between PLC and Raspberry pi. And using TTL to RS485 Converter. I don't know how to write program for raspberry pi, please give me any example code.