User`s guide

On the BCS Server, we recommend the Equinox SST-64 board with the PM16-
RJ/422 Port Module, which has 16 RS-422 ports using RJ-45 sockets. Up to 4
such Port Modules can be attached to each other in series for a total of 64 ports
without opening the computer or changing software or driver settings.
NOTE: On the back of the Equinox board is a pin-out diagram. Several
manufacturers' documentation conflict over the meaning of symbols like "TX A"
and "TX B". Equinox and Digi use "A" to represent "+", while Sony, Profile and
AirSPACE (Sony compatibles) use "A" to represent "-". In this document, we will
only use the -/+ symbols.
From Equinox RJ45 to DB-9 Profile
RJ45 cable Adapter DB9 RS-422 port
n/c 1 n/c
n/c 2 Blue n/c
GND 3 Orange to 1 1 GND (frame ground)
RX - 4 Black to 2 2 TX -
TX + 5 Red to 3 3 RX +
not provided 4 RX Common
not provided 6 TX Common
TX - 6 Green to 8 8 RX -
RX + 7 Yellow to 7 7 TX +
GND 8 Brown to 9 9 GND (frame ground)
n/c 9 White n/c
n/c 10 n/c
(using Frame Ground is optional.)
If you wish to use a DIGI board with a DB25 Octopus cable in place of the
Equinox, you can still use the connector and cable described above, with this RJ-
45/DB-25 modular adapter on the DIGI Octopus cable: