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Installation, cont'd
2
PC
Host Port
Connections for RS-232 loop-through
Contact Closure Control
Contact closure provides another method of input selection.
To enable input selection by contact closure, you can connect a
push-button contact closure device (such as Extron's 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, etc.
Controlling an Extron A/V switcher in 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, input selection
on both switchers can be done by contact closure (as well as
by the SW USB front panel buttons and the RS-232 interface).
To select inputs on the A/V switcher via contact closure, the
SW USB must be in Loop 0 mode (in other words, the SIS
E
command
LOOP0
If the SW USB is in Loop 0 mode and an Extron A/V switcher
is connected to the RS-232 Pass Thru port, an input selection
command issued via contact closure selects the same input on
both the SW USB and the connected switcher.
2-12
SW USB Series • Installation
TX
TX
TX
RX
3
RX
5
SW USB
Extron
A/V Switcher
}
has been issued) .
U B
T H
B 3
P U
US
U T
B O
U S
B 2
B 4
US
US
B 1
US
P U
T
IN
4
IN
G
PC
C H
W IT
B S
3
U S
PC
2
PC
1
PC
R
WE
PO
V
X
12
A MA
1.5
+
Extron
SW4 USB
USB Switcher
T S
P U
IN
1
A
0.2
40
V
0-2
10
2
Extron
Hz
50
-60
SW4 VGA Ars
VGA/Audio Switcher
Using the SW USB with a contact closure device and
an A/V switcher
To configure the SW USB 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.
Issue the SIS command E 0LOOP} to the SW USB to
3.
enable Loop 0 mode.
Connecting Multiple SW USB Switchers in a
System
The USB specification states that a maximum of five hubs can be
connected in a series; therefore, no more than five SW USBs can
be cascaded in a series.
C
Do not exceed five cascaded hubs and a total of 127
peripheral devices in the entire system.
The diagram on the next page shows an example of SW USBs
and peripheral output devices daisy-chained from a single host.
Contact Closure
-2 32
RS
T
AC
CO
NT
4
3
Tx
Rx
1
2
Tx
-2 32
RS
TH
RU
SS
PA
RS-232 Loop Out
Extron
CCR 4BLB
Controller Module
A rs
G A
6 V
S W
O TE
R EM
U T
T P
O U
U T
R
T P
O U
L
3
4
SW USB Series • Installation
2-13
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