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Wiring for RS-232 Communication
RS-232 Port
The 3-pole, 3.5 mm captive screw connector labeled "RS-232" is used for optional RS-232
communication between the SW USB and a computer or control system. The control
system plugged into this port can issue commands to the SW USB, which can pass the
commands through to an Extron AV switcher that is plugged into the RS-232 Pass Thru
port.
NOTE: The computer that you use for RS-232 control should not be one of the host
To connect your computer or control system to the RS-232 connector, use a female 9-pin
D-to-bare-wire RS-232 cable, such as an Extron UC50 Universal Projector Control cable.
1.
2.
RS-232 Pass Thru Port
The RS-232 Pass Thru port loops the signal received at the SW USB RS-232 control port,
the Contact (closure) port, or the front panel input buttons through the RS-232 Pass Thru
port to send SIS commands to another Extron AV switcher.
NOTE: Only Extron products can be controlled via this port.
devices connected to any of the input ports.
Wire the unterminated end of the RS-232 cable to one of the provided 3-pole captive
screw plugs.
Plug the wired 3-pole connector into the RS-232 receptacle on the SW USB rear panel.
SW USB Switcher
RS-232
Rear Ranel
RS-232 Port
Tx Rx
NOTE: Connect a ground wire between
the switcher and the computer or
control system.
(Rx) Receive Pin to Transmit (Tx) Pin 3
(Tx) Transmit Pin to Receive (Rx) Pin 2
NOTE: If you use cable that has a drain
wire, tie the drain wire to ground at
both ends.
Host PC Pin Switcher Pin
2 (Rx)
Tx
3 (Tx)
Rx
_
5 (Gnd)
Figure 7.
Wiring the RS-232 Connector
Ground
To Computer or
Control System
RS-232 Port
SW USB Series • Installation
9-pin
Connector
11
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