Using a Black Box Corp Short Haul modem Model 800A or similar
here are the connections.
Allen Bradley connector Black Box Corp. connection
pin 2 RXD- --------------- TXD+
pin 1 RXD+ --------------- TXD-
pin 3 TXD- --------------- RXD+
pin 8 TXD+ --------------- RXD-
pin 7 GROUND --------------- GROUND
The connections are transposed on the Black Box Corp. end.
The Txd+ goes to the Rxd- on the A-B Side.
The Txd- goes to the Rxd+ on the A-B side.
The Rxd- goes to the Txd+ on the A-B side.
The Rxd+ goes to the Txd- on the A-B side.
Here is the link:
http://www.isr.uc.pt/~lino/AIR/Arquivo/slc100.zip
For the pin-out on the 8-pin DIN connector go to this website:
http://www.gefanuc.com/totalcontrol...greylline/greyline_cable_diagrams/cbl-120.doc
Search the old plcs.net site for "slc100", be sure to switch on
all the options.
I believe a standard RS422 to RS232 converter would work if you
can't find the Short Haul Modem.