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C841M-A (7/02) 11
ALARMS
The alarm inputs must be enabled or disabled if you connected alarms on the switcher to them.
To enable or disable alarms:
1. Press the MON 1 button.
2. Press the recessed ALARM switch. The switch toggles the alarm inputs on and off. When the ON LED is lit, the alarm
inputs are enabled. When the ON LED is out, the alarm inputs are disabled. The switch enables or disables all alarm
inputs.
3. Press the MON 2 button, then press the ALARM switch to enable or disable the alarms for monitor 2.
When there is an alarm, the switcher displays video on the monitor that corresponds to the alarm input. For example, if there is
an alarm on input 3, the switcher displays video from camera 3. If there are multiple alarms, the switcher sequences between
the alarms every second.
EXTERNAL TRIGGER
The external trigger allows the switcher to accept a signal from a time-lapse VCR to control the sequencing of cameras. The
recessed EXT TRIG switch toggles the external trigger on and off. When the LED is lit, the external trigger is enabled. When
the LED is out, the external trigger is disabled.
Camera input switching occurs every time a positive logic pulse (ground to +5 V) is sensed on the external trigger input. The
maximum rate of sequencing is every 16.7 ms, which allows capture of one field of video between switching. The external
trigger activates switching on both monitor outputs. In the alarm mode, the external trigger overrides the alarm sequencing
dwell time.
POWER-UP DEFAULT SETTINGS
On power up, the default settings retain the configurations for camera sequences, but require that any sequence be manually
started. For a sequence to start automatically during power-up, the unit must be programmed to remember the default settings.
To program the default setting that you want upon restoration of power:
1. Operate the unit in the desired default setting.
2. Press and hold the GLOBAL button and momentarily press the SEQ key. The new default setting is stored.
3. Release the GLOBAL button.