302-311

[kaputt]

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Hi!

Does anyone have (a link to) the description of this protocol? The 110A pheripheral IO is still alive, and I occationally see it used out there.
I noticed that the cable is thin, so electrically it might be RS422.
I just wondered; if I knew the prot, and had some spare time

, I could make a driver to these IOs in Step7.

Regards
Kaputt

 

[kaputt]

I found out, at last. It is RK3964 running on a current loop.
It seem to have a control sign after STX-DLE; NOP/ BASP/ UNBASP / NAK and then the output state is sent from 302 on change. Opposite the 311 initiates the input status sending on change.