Extron electronics VSW 2VGA A User Manual page 15

Installation and Operation, cont'd
e
Contact closure/Autoswitching (Contact/Auto-SW) —
Contact closure — Connect a contact closure device to
this 3.5 mm, 3-pole captive screw connector.
• Pin 1 selects Input 1 when momentarily connected
to ground (pin 3).
• Pin 2 selects Input 2 when momentarily connected to
ground (pin 3).
• Ground connects to the ground wire (equipment ground).
N Simultaneously connecting both pins 1 and 2 to ground
(pin 3) turns autoswitching mode on.
Autoswitching —
N Autoswitch mode must be disabled when daisy chaining
VSW 2VGA A switchers. If the autoswitch mode is
enabled, the switchers cannot be daisy chained.
Pins 1, 2, and Ground when jumpered/shorted together
(as shown at right) turn the autoswitching mode on.
When the autoswitching mode is on, the switcher
automatically switches to the input that has an active
sync signal.
If both inputs have an active sync signal present, input 2 is
selected, and the input 2 LED indicator lights. If no active sync
signal is present, the input 1 LED indicator still lights to indicate
that the unit is still powered on.
N When autoswitch mode is active, both daisy chaining and
the front panel's input toggle switch are disabled, and the
input cannot be manually switched. Any attempt to toggle
the switch while the switcher is in this mode results in
the flashing of the currently active input's LED indicator.
Contact closure is also disabled while in autoswitch mode.
VSW 2VGA A • Installation and Operation
2-12
1 2
CONTACT
1 2
Power connnection
One power supply can power up to five daisy chained
switchers. Additional switchers require one or more power
supplies. See "Configuring the daisy chain and power
considerations", later in this chapter.
Figure 2-12 shows how to wire the power connector.
Smooth
Ridges
A A
Power Supply
Output Cord
Figure 2-12 — Power connector wiring
The two power cord wires must be kept separate
C
while the power supply is plugged in. Remove
power before wiring.
C When you are connecting the power supply, voltage
polarity is critical. Applying power with incorrect
voltage polarity could damage the power supply
and the VSW 2VGA A. Identify the power cord
negative (ground) lead by the ridges on the side of
the cord or a black heat shrink wrapping around it.
N Strip the jacket to expose 0.2 inches (5 mm) of the
conductors. Do not tin the stripped power supply leads
before installing the captive screw connector. Tinned wires
are not as secure in the captive screw connectors and could
be pulled out.
To verify the polarity before connection, check the no load
power supply output with a voltmeter.
N The maximum number of switchers that can be daisy
chained is limited by several factors: power consumption,
cable lengths, and the overall distortion of the video and
audio signals.
VSW 2VGA A • Installation and Operation
SECTION A–A
Captive Screw
Connector
2-13