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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 5 below.
RxTx
Alarm Device
RS-232 Device
G
RS-232
OVER FIBER ALARM
Tx Rx G12
12
Figure 5. Wiring the RS-232 Over Fiber and Alarm Connector
ATTENTION: The length of exposed wires is critical. The ideal length is
3/16 inch (5 mm).
• Longer bare wires can short together.
• Shorter wires are not as secure in the connectors and could be pulled out.
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.
Wiring for Remote Contact Closure Communication
Each port senses an external switch or contact closure. Use these ports to select an input
on the switcher. Wire the connector as shown in figure 6 below.
CONTACT
123G
Ground
Wire Nut
Device 3
Device 2
Device 1
(Switches,
relays, or
similar items)
Switch
1
2
3
G
Heat
Shrink
Over
Shield
Wires
Figure 6. Wiring the Contact Closure Connector
FOX T USW 203 Universal Switcher • Installation 8