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I am Not Able to establish communication between Modbus(Master) and Arduino(Slave) Plz Help Thanks in advance..

sunilg516

I need help to respond back from a Modbus Slave with a value into holding register, so that i can publish certain values like temperature ,pressure etc from our PLC (Arduino) to third party systems like Modscan or BMS software. Please Help

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    Hi Sunil, we’re probably going to need a little more information to go on, including an idea of how much you know and understand about MODBUS, and how much experience you’ve got with this.

     

    For starters, is this MODBUS ASCII, RTU or TCP/IP?

     

    Is your hardware ok, and is your Arduino code receiving the message at all, and is it understanding it correctly?

     

    Have you got yourselves a copy of the MODBUS protocol documents?

     

    Finally, is this a commercial project? It sounds a lot like it is, in which case we’ll done for winning it, now you’re on a steep but worthwhile learning curve!

     

    A

  • 0 in reply to abrain

    i am using modbus RTU , Hardware is good and my arduino receiving the message, i am a fresher not an expierienced...it is a commercial project.

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