
2-11
SW USB Series • Installation
PRELIMINARY
Contact Closure Control
Contact closure is another method of input selection. To enable input selection by
contact closure, you can connect a push-button contact closure device (such as an
Extron CCR 2BLB, CCR 4BLB, or CCR 204) to the SW USB’s Contact port.
Alternatively, you can manually short one of the pins to ground (the ground [_]
pin is pin 3 for SW2 and pin 5 for SW4 models). Pin 1 selects input 1, pin 2 selects
input 2, and so forth.
Controlling an Extron A/V switcher (Loop 0 mode)
For applications in which the SW USB is connected to an Extron A/V switcher that
can be controlled via RS-232, inputs can be selected on both switchers by contact
closure, as well as by the SW USB front panel buttons and via the RS-232 interface.
To select inputs on the A/V switcher using contact closure, place the SW USB in
Loop 0 mode. Then, when you press a button on the contact closure device or
jumper-connect the
_
pin with one of the other pins in the Contact connector, the
SW USB sends an input selection SIS command (
X!
!, where
X!
is the input number)
through the RS-232 Pass Thru port to the A/V switcher, causing it to switch inputs.
USB SWITCHING INPUT
Tx
Tx Rx
RS-232
CONTACT
1
2
3
4
RS-232
PASS THRU
USB OUTPUT HUB
USB 3
USB 1
PC 1
PC 2
PC 3
PC 4
USB 2
USB 4
1.5A MAX
12V
POWER
+
100-240V 0.2A
50-60Hz
REMOTE
INPUTS
1
2
3
4
OUTPUT
OUTPUT
L
R
SW6 VGA Ars
Extron
SW4 USB
USB Switcher
RS-232
Loop-through
Contact Closure
Extron
CCR 4BLB
Controller Module
Extron
SW4 VGA Ars
VGA/Audio Switcher
1
2
3
4
Using the SW USB with a contact closure device and an A/V switcher
To set up for contact closure control of an A/V switcher,
1. If desired, connect a contact closure device to the SW USB’s Contact port.
2. Connect the SW USB’s RS-232 Pass Thru port to the A/V switcher’s RS-232
port.
3. Issue the SIS command
E
0LOOP} to the SW USB to enable Loop 0 mode.
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