User guide
FOX T USW 203 Universal Switcher • Installation 8
Wiring for RS-232 Over Fiber and Alarm Communication
The RS-232 Over Fiber port is for transmission of serial signals, such as projector control
signals. The alarm port is an internal relay to connect or disconnect a custom alarm circuit.
Wire the connector as shown in figure 3 below.
RxTx
Alarm Device
RS-232 Device
G
RS-232
OVER FIBER ALARM
Tx Rx G12
12
Figure 3. Wiring the RS-232 Over Fiber and Alarm Connector
ATTENTION:
• The length of exposed wires in the stripping process is critical. The ideal length is
3/16 inch (5 mm).
• La longueur des câbles exposés est primordiale lorsque l’on entreprend de les
dénuder. La longueur idéale est de 5mm (3/16inches).
• Any longer and the exposed wires may touch, causing a short circuit between
them.
• S’ils sont un peu plus longs, les câbles exposés pourraient se toucher et provoquer
un court circuit.
• Any shorter and the wires can be easily pulled out even if tightly fastened by the
captive screws.
• S’ils sont un peu plus courts, ils pourraient sortir, même s’ils sont attachés par les
vis captives.
For RS-232 over fiber connection, cross the Tx and Rx lines once between the source and
the target.
The alarm pins do not produce any discrete on or off or voltage signals.
NOTES:
• The alarm port does not produce any discrete on or off voltage signals.
• If power is lost or if link 2 optical light is disconnected, lost, or broken, alarm pins 1
and 2 internally short.