Monroe Electronics R174A - Manual (Page 6)

6
INSTALLATION
Mounting:
The R174A requires a minimum of 3.5 vertical inches of space in a standard 19” wide EIA
equipment rack. Slide the unit into the rack frame and secure it, using the 3000R/22M
mounting hardware supplied with the unit.
Connections:
1. The Video (or IF/RF) switches are mechanical relays. Connections to them
are made through 75
Ω
BNC connectors on the rear of the unit. Connect your
cable for the default signal to the NC (normally closed) connector. Connect
your cable for your alternate signal - which you will substitute for the default
signal - to the NO (normally open) connector. Connect the cable to your modulator
or other destination to the COM (common or output) connector.
These connectors will switch either video signals, or may alternately be used to
switch high frequency signals, such as IF or RF. The frequencies useable are
shown on the frequency response charts included.
It is also permissible to use some relay sets for baseband video and some
for high frequency, since all switch modules are isolated.
2. If the signals being switched are baseband audio follow video, with audio following,
connect the audio signals to screw terminals of the same switch set, ensuring that the left
and right channels for the default audio are connected to the L NC 1 and 2, and the
R NC 1 and 2, and the signals for the alternate signal are attached to the L NO
1 and 2 and the R NO 1 and 2 connectors. The L OUT 1 and 2 and the R OUT
1 and 2 are routed to the modulator or other destination of the audio signals.
3. If you are using the unit with a contact closure switcher, connect the switch
for each Relay Unit to the connector for Contact Closure as appropriate.
4. If you are using the unit with the optional SwitchWare2

control software,
refer to the SwitchWare2

manual to connect the RS485 wiring to it’s
connector, and set the appropriate unit code.
5. Connect the +12 VDC lead (white) from the power supply provided with the unit
to the +12V terminal on the POWER connector, and the black lead from the power
supply to the GND terminal. Plug the model supply power outlet, and the unit is ready to
function.
6. To connect the audio DTMF tones to the individual switch, attach the supplied cable
assembly to the RJ-11 4/4 connector. (if 2 cables are supplied terminated with RJ-11
connectors on each end they must be cut in half and the wires stripped before hook up.)
Refer to the wiring diagram on page 7 in this manual for hook-up information. DO NOT
CONNECT A TELEPHONE LINE TO THE JACK. IT WILL VOID THE WARRANTY