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10
ACS 4.4 G2 Installation and Operation Manual
OPERATION
PIP / Trigger Inputs
The 16 “PIP” (GPI/Trigger) inputs are used to monitor external contact closures and
pass that information back to the control/automation computer. Response time is set
for 50ms minimum by default but may be configured from 40ms to 2.54 seconds.
The inputs are pulled high to 5 volts through internal 22KΩ resistors and activated
by pulling the input low, to ground. These inputs supply status to any polling serial
device (when the unit ID is set to 0 (ZERO), no polling of inputs is required. Polling
IS required if the unit ID is set above zero).
(Top row, TB-2)
Remote Control Mode (SW2-8 = OFF)
PIP Mode (SW2-8 = ON, Default)
Silence Sensors
The each of the four outputs on the ACS 4.4 G2 are monitored by a silence sensor.
The factory default alarm delay is set at 10 seconds, with a threshold of -25 dB,
while the restore time is set at two seconds. Upon silence delay detection, the appro-
priate “SS” led will illuminate and the corresponding (SSx) open collector will go
logic low for the duration of the silence. The sensor may be programmed for:
• Number of seconds of silence (delay) that must be present before an alarm state
is reached or terminated.
• Number of seconds that valid audio (restore) must be present before an alarm
state is cleared.
• Alarm threshold of: -20, -25, -30, -35, or off (disabled).
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