Appendix A
241
14 Appendix A
Connecting Alarm Input/Outputs
This appendix contains the following sections:
• Before Connecting Alarm Inputs and Outputs, on page 241
• Alarm Input and Output Rear Panel Connections, on page 241
• Guidelines for Connecting Local Alarm Input Ports, on page 242
• Guidelines for Connecting Alarm Output Ports, on page 242
Before Connecting Alarm Inputs and Outputs
• Ensure that the alarm input mode is set to ground.
• Ensure that the signal is grounded.
• Know that the alarm inputs require low-level voltage signals.
• Ensure that the alarm input mode is set to either NC (normally closed) or NO (normally
open).
• Use a relay if you are connecting two NVRs, or a NVR plus another device, to separate
them.
• Do NOT directly connect the alarm output port to a high-power load. The load should be
less than 1 A to avoid damage.
• Use the contactor to make the connection between the alarm output port and the load.
Alarm Input and Output Rear Panel Connections
The connections for the alarm input and output channels are described below:
Table 14-1 Alarm Input and Output Rear Panel Connections
Input/Output Description
1 to 4
Alarms inputs 1 to 4. The inputs becomes active with
low voltage.
NO1 C1, NO2
C2
Normally open activation outputs (on/off)
Ground
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