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11
ACS 4.4 G2 Installation and Operation Manual
OPERATION
Status Open Collector and Silence Sense Open Collector Outputs
The ACS 4.4 G2 has four open collector status outputs labelled, OC1, OC2, OC3,
and OC4 respectively. The status open collector (OCx) output for the selected chan-
nel will go low providing a return (ground) for an LED indicator, TTL/CMOS logic,
or relay. External pull-up resistors may be required in some installations, voltages
must be limited to 6 VDC at 100 mA maximum.
In addition to the status open collector outputs, four silence sense alarm open col-
lector outputs are also present labelled SS1, SS2, SS3, and SS4 respectively. When
the output silence sensor is enabled, the open collector will go low when silence is
detected and stay low until valid audio returns to the output. External pull-up resis-
tors may be required in some installations, voltages must be limited to 6 VDC at 100
mA maximum.
The open collector outputs are located on pins 1-8 of the bottom TB-2 terminal block
connector.
(Bottom row, TB-2)
Relay Outputs
The ACS 4.4 G2’s two SPDT relay outputs can be used to control external equipment
using contact closures. The relays are controlled by serial commands. Each relay can
be commanded by serial command to: pulse, latch on, or latch off. The relay connec-
tions are located on pins 9-16 of the bottom TB-2 terminal block connector.
(Bottom row, TB-2)
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