Model SK-4224 Fire Alarm Control Panel Installation/Operation Manual
4-16
151068
Wiring SK-2880 Open Collector Outputs
Figure 4-15 illustrates examples of how to configure the open collector outputs on the I/O
module for your uses.
Figure 4-15 Output Configurations
Pin 3
Pin 1
NAC 1 Trouble
Outputs when a trouble condition exists on NAC 1.
Pin 2
NAC 2 Trouble
Outputs when a trouble condition exists on NAC 2.
Pin 3
NAC 3 Trouble
Outputs when a trouble condition exists on NAC 3.
Pin 4
DACT Trouble
Outputs when any type of trouble occurs with the dialer,
such as, no line voltage or a communication failure.
Pin 5
Expander Trouble
Outputs when one of the Serial Devices connected to the
control panel is in trouble.
Pin 6
Alarm Silenced
Outputs when an alarm has been silenced.
Pin 7
Low AC
Outputs if the control panel looses AC power or AC
power drops below the control panels low AC threshold.
Pin 8
Low Battery
Outputs when the backup battery voltage drops below
20.4 VDC.
Pin 9
Ground Fault
Outputs when the control panel detects a ground fault
condition.
Pin 10
Walk Test Active
Outputs when the control panel is in walk test mode.
Pin 11
Piezo Output
Outputs correspond to any trouble condition output from
the control panel.
Pin 12
Local Trouble
Outputs if the end-of-line resistor on the Reset or silence
inputs not detected or if a serial communication problem
occurs between this device and the control panel.
Table 4-6: Pin-outs for Open Collector Outputs
Pin
Connector
Pin Number
Output
Description
To P2, Pin 11 or
+ on Terminal Strip 1
LED
Dry Contact Relay
Current Limiting
Resistor Must Be
at Least 1 k
Ω
Provided by the UL
Listed Graphic Annunciator
Note:
The SK-2880 and the UL Listed
Graphic Annunciator Must be in
the same room.
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