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Thread: modbus question

  1. Jul 18th, 2008, 09:44 AM #1
    paulcat1283
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    modbus question

    Does anyone have any experience with modbus programming in VB? Is it pretty similar to serial port programming?

    Where can I get a master dll for free?
    Thanks
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  2. Jul 18th, 2008, 10:56 AM #2
    Clanguage
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    Re: modbus question

    Here is a couple of links to answer your questions

    http://www.codeproject.com/KB/trace/modbuscs.aspx
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  3. Jul 18th, 2008, 10:57 AM #3
    Clanguage
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    Re: modbus question

    I guess the second link landed in no-man's land
    http://en.wikipedia.org/wiki/Modbus
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  4. Jul 18th, 2008, 09:03 PM #4
    kebo
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    Re: modbus question

    Modbus is a software specification that governs how information is bundled into packets and sent and does not specifiy what medium the data is sent on. It can be sent over serial ports (RS-232, RS-422 or RS485) or it can be sent over TCP connections. So yes, Modbus can literally be serial port programming or it can be TCP programming depending on the hardware you are trying to communicate with. Most of what I do uses Modbus connections, so if you need some more modbus specific info, let me know and I'll help if I can.
    kevin

    ps... here is a link to the Modbus specification
    Last edited by kebo; Jul 18th, 2008 at 09:08 PM.
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