Hello all,

I have recently swapped from communication RS422 4 wires, modules which means from        6SE7138 4DF01 0AB0 to 6ES7137 6AA01 0BA0. . I found that I need it to swap the TX polarity,with each other and the RX polarity ,with each other in this new CM module which is not clear why because the polarity was always working with the old CM stations, When install it according the 137 document then the polarity does match . is there some hardware setting in step , for this 137 CM module which can swap the TX and the RX polarity?

please see the drawing which clarify a bit better

Kind regards

Ferry

Closed cause question posted twice.

The second thread with the subject CM PtP is published within the conference Communication / Networks.