• RS422 vs 485 What's the difference?

    From helgayork1@gmail.com@21:1/5 to Melo on Thu Feb 22 08:39:09 2018
    On Thursday, July 23, 1998 at 10:00:00 AM UTC+3, Melo wrote:
    I need to communicate srially between a plc (AB PLC5 - via a Prosoft card) and a DCS (Moore Products APACS). I can do it using either the RS422 protocol or RS485. I don't know what the differences between these protocols are. Any information would be appreciated. Is there an
    advantage in using one over the other?

    Ed

    Hi!
    RS485 is a standard for serial data transmission. Data exchanged through RS485 interfacing primarily uses the MODBUS protocol. RS232 devices use text (ASCII) protocols. This difference implies that needs to know about the MODBUS when using RS485
    communication devices. Learn more about RS485 and MODBUS here - https://www.eltima.com/article/modbus-vs-rs485/

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  • From David Brown@21:1/5 to helgayork1@gmail.com on Fri Feb 23 09:08:11 2018
    On 22/02/18 17:39, helgayork1@gmail.com wrote:
    On Thursday, July 23, 1998 at 10:00:00 AM UTC+3, Melo wrote:
    I need to communicate srially between a plc (AB PLC5 - via a
    Prosoft card) and a DCS (Moore Products APACS). I can do it using
    either the RS422 protocol or RS485. I don't know what the
    differences between these protocols are. Any information would be
    appreciated. Is there an advantage in using one over the other?

    Ed

    Hi! RS485 is a standard for serial data transmission. Data exchanged
    through RS485 interfacing primarily uses the MODBUS protocol. RS232
    devices use text (ASCII) protocols. This difference implies that
    needs to know about the MODBUS when using RS485 communication
    devices. Learn more about RS485 and MODBUS here - https://www.eltima.com/article/modbus-vs-rs485/


    I applaud your enthusiasm to help. And it's nice to see an on-topic
    post in this virtually dead newsgroup. However, there are two key
    problems with your post.

    1. You are answering a question that was asked 20 years ago. I assume
    the OP has either found the answer some where else, or given up waiting
    by now.

    2. Your answer is completely wrong.

    If you are interested in knowing the difference between RS-485 and
    RS-232, you can ask and I am sure there are a few lurkers here who will
    help (or you could ask in a more lively group). If you just want to
    advertise for a somewhat muddled web article, then you have succeeded.

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