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Communications Protocol

  • 27-11-2009 11:55am
    #1
    Macca07
    Registered Users, Registered Users 2 Posts: 1,223 ✭✭✭


    Anyone here ever code a Communications Protocol like Modbus, IEC or DNP3?

    Have been looking into coding one and just wondering where to start


Comments

  • #2
    Evil Phil
    Registered Users, Registered Users 2 Posts: 7,468 ✭✭✭Evil Phil


    Reading the rfc sites might be a good start.

    Modbus = http://www.modbus.org/tech.php links to their rfc site.

    IEC = http://www.faqs.org/rfcs/rfc3189.html <- I think that's IEC :confused:

    I can't find one for DNP3. I've never worked with these protocols, I don't even know what their for, but I've found reading RFCs a great starting place with other protocols.


  • #3
    Macca07
    Registered Users, Registered Users 2 Posts: 1,223 ✭✭✭Macca07


    They're used for communicating between two devices, just doing it for fun as it would look good on my CV. Don't know enough about them to just start it, thanks Phil for the link


  • #4
    DublinDilbert
    Registered Users, Registered Users 2 Posts: 5,401 ✭✭✭DublinDilbert


    Modbus isn't too bad to get started with. You can even download software simulators to emulate modbus slaves and you can code the master to communicate with it.

    To talk to an actual modbus slave you'll need an RS232 to RS485 converter,to make the physical layer connection. You can get these on deal extreme for around $5.


  • #5
    Macca07
    Registered Users, Registered Users 2 Posts: 1,223 ✭✭✭Macca07


    have the 2 converters already, well as good as anyway, and was looking into it a bit more and think I'm gonna try the DNP3


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