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HMI and modbus

kppp kpp

hello,
i m using c8051f020 microcontroller.
i want to interface HMI touch screen with modbus protocol.
i m planning to used ASCII format and 485 communication.
i hav read the theory of modbus communication.
can u guide me what all points should i consider about HMI and modbus?

  • 0

    Modbus has 3 different protocols:

    Modbus ASCII
    Modbus RTU
    Modbus TCP/IP

    You need to be sure that the device(s) you are talking to are working on Modbus ASCII if you are wanting to use Modbus ASCII. I would recommend searching around on the internet to download a Modbus protocol specification. Its a pretty easy specification to implement.

    As far as "HMI", thats completely up to you and your situation. HMI is "Human-Machine Interface" and is basically a GUI (or just UI) that goes between your device and your machine. There is no "guide" to follow, if you are looking for guidelines on creating a GUI, check out books at Amazon.com on GUI. HMI's are VERY application dependant, I develop HMI's for a living.