Adding 7i73 to working setup 5i15 7i77 7i84

I think the RX and TX polarities are reversed,
So swap RJ45 1,2 and 3,6

Peter thanks for the effort, it works !

Bringing this topic back from the dead........... I am looking to build the same setup:

6I25 7I77 7I84 and 7I73
I am fine with buying the 7I74 interface but am unclear on how / where  it gets interfaced to the system.

Thanks in advance.

Erik

The 7I74 connects to the second 6I25 expansion connector (P1)