VXC-114U/144U/144iU User’s Manual (Ver. 1.2, Mar.11, 2009) -----17
2.3.5. VXC-182iU Pin Assignment
CN1: Isolation RS-422/485 port
Warning:
The RS-485 bus is a differential (balanced)
signal, thus
you cannot wire the Data+ with Data-
directly for a single port loop-back test.
It will not
work at all!
CN2: RS-232 port
RS-232 Cable Wiring (Null Modem)