Extron electronics RAC 104 User Manual page 19

RS-232 connector — Plug an optional RS-232 device into this
3
3-pole captive screw connector. Wire the connector as shown
below.
Transmit (Tx)
Receive (Rx)
Ground (Gnd, )
Pin RS-232 function
1 Tx
2 Rx
3 Gnd
Line level selector DIP switches — Set these switches to
4
-10 dBV (unbalanced, consumer line level) or +4 dBu (balanced,
professional line level). There are four switches, one for each
input group and output group.
IN OUT
A B A B
ON
+4 dBu
-10 dBV
LINE LEVEL
Power connector — An external 12 V power supply is included
5
with the unit. Plug it into this 2-pole captive screw connector.
Wire the connector as shown below.
Smooth
Ridges
A A
SECTION A–A
Power Supply
Output Cord
When connecting the power supply, voltage
CAUTION
polarity is extremely important. Applying power
with incorrect voltage polarity could damage the
power supply and the RAC 104. Identify the power
cord negative (ground) lead by the ridges on the
side of the cord or a black heat shrink wrapping
around it.
The two power cord wires must be kept separate
while the power supply is plugged in. Remove
power before wiring.
To verify the polarity before connection, check the no load
power supply output with a voltmeter.
RAC 104 • Installation and Operation
Description
Transmit data
Receive data
Signal ground
Tie Wrap
Orange Captive Screw
Connector
2-7