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From Christofer Dutz <>
Subject Re: Master ? Slave? Both?
Date Sun, 31 Dec 2017 10:53:05 GMT
Hi Niclas,

well I wouldn’t say that we should do just Master. I guess right now development has been
driven by the use case. And the probably most important use case for me was reading from an
S7. One use case down the S7 road that I would like to implement soon is that a client using
PLC4X can subscribe for Alarm messages and Parameter values of a S7 PLC and that then actively
sends data to PLC4X. Would that be called “slave”? If it is, I guess both are highly important,
just haven’t got to the point of implementing that. 


Am 31.12.17, 05:02 schrieb " im Auftrag von Niclas Hedhman" <
im Auftrag von>:

    I am getting the impression that only "Master" side of these protocols are
    in scope. Or?
    In any case, I have previously made a C library for ModBus (from spec), and
    I could see if it is worth dusting off and contribute. Is it of interest,
    or? It might not be complete, and I recall it follows a OO-style of C
    programming that not everyone appreciate.
    Niclas Hedhman, Software Developer - New Energy for Java

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