Alarm And Switch Terminals; Connecting An Alarm Or Switch Device - March Networks 8704 S Hybrid NVR Installation Manual

Alarm and Switch Terminals

There are alarm and switch terminals on the back of the unit. Alarm and switch devices
can connect to these.
Alarm and switch terminals
Pinout
Relay RS232
NC C NO Rx
A1 G A2 Tx
Alarms

Connecting an Alarm or Switch Device

Using the following procedure, you can connect alarm and switch devices to the terminals at the
back of the unit.
Note: End-of-Line (EOL) resistors are not supported. Only Open and Closed states are monitored.
To connect an alarm or switch device
1 Ensure the unit is powered down and the LEDs at the front of the unit are off.
2 Locate the appropriate alarm or switch terminals (refer to the graphic above).
3 Attach the device to the appropriate terminals:
For alarm devices:
• Use the G (ground) terminal when connecting the common wire.
Note: The alarm input is open/short, dry contact only.
For switch devices:
• Connect the switch device common wire to the common (C) terminal.
Note: The maximum voltage for a connected switch device is 60 volts DC input at 1 Amp
or 60 Watts. Anything above 60 Watts must be handled by a second-stage relay control
circuit, approved and validated by certified electrician.
• Depending on the switch's default state, connect the normally-open or normally-closed
wire to the normally-open (NO) or normally-closed (NC) terminal, respectively.
4 After you connect the alarm and/or switch devices, you can turn on the unit.
8704 S Hybrid NVR (Gen 2) Installation Guide
Audio Out
G G 1
1 G 2
Audio In
Feature Overview
18