Installation Guide
AT-OMNI-121
4
The AT-OMNI-121 provides transport of RS-232 protocol over IP which allows communication
between a control system and an RS-232 device. This step is optional.
1.
Use wire strippers to remove a portion of the cable jacket.
2.
Remove at least 3/16” (5 mm) from the insulation of the RX, TX, and GND wires.
3.
Insert the TX, RX, and GND wires into correct terminal on the included captive screw
connector, following the wiring diagram below.
Note that the included 6-pin push-spring connector can be used, if desired, in place of the
captive screw connector. Only the
RS-232 1
port is available on the decoder.
RS-232
GND
RX
TX
NOTE:
Typical DB9 connectors use pin 2 for TX, pin 3 for RX, and pin 5 for
ground. On some devices, the function of pins 2 and 3 are reversed.
IR
The same port that provides RS-232 connections also supports bidirectional IR pass-through,
allowing a device to be controlled from either the headend or the decoder endpoint. This step is
optional. IR control is only supported on RS-232 2 port (bottom set of connectors).
IR emitter configuration
IR extender configuration
GND (black)
IR emitter
SIGNAL (white/black)
RX TX GND
GND (black)
SIGNAL (white/black)
Control
Unit
TX out
GND
RX TX GND
