Sony SSM-Q177 Operating Instructions Manual page 9

Notes
• When the display shows freeze picture in Quad mode,
VCR OUT (BNC) connector will also output freeze
picture.
• When playing back on the VCR (when the INPUT select
switch is down), VCR OUT (BNC) connector outputs
nothing.
5 ALARM connector
IN ALARM mode starts by short-circuiting between
connectors of each channel. Connect to external sensors
such as infrared sensors or door sensors. Each of the
connectors corresponds to No. 1, 2, 3, and 4 of the
CAMERA IN connectors respectively. The monitor
display switches to a picture from the camera that has
sent the alarm signal.
OUT During the ALARM mode, the output voltage is
LOW (0V).
Trigger OUT When the ALARM mode is activated,
starts an output at LOW (0V) for 100ms, then switches
to HIGH (5V) output.
Other functions
If there is no incoming video signal for a channel before and
after turning on the main power, the channel will show
flashing "NO VIDEO" display on a black background.
If an incoming video signal stops after the main power is
turned on, the screen will display the last video input in a
FREEZE picture with the flashing "NO VIDEO" display.
After a while, the display stops flashing.
To exit FREEZE picture, reestablish signal input or turn off
the monitor and restart.
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