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Alarm Input/Output
Alarm In 1 to 8 (Alarm-In): You can use external devices to signal the DVR to react to events.
Mechanical or electrical switches can be wired to the AI (Alarm-In) and GND (Ground) connectors.
The threshold voltage for NC (Normally Closed) is above 4.3V and for NO (Normally Open) is
below 0.3V, and it should be stable at least 0.5 seconds to be detected. See Chapter 3 ─ Configuration
for configuring alarm input.
GND (Ground): Connect the ground side of the Alarm input and/or alarm output to the GND
connector.
NOTE: All the connectors marked GND are common.
NO (Normally Open): Connect the device to the COM and NO (Normally Open) connector.
NO is a relay output which sinks 1A@30VDC.
Connector Pin Outs:
RS485 Port
The DVR can be controlled remotely by an external device or control system, such as
a control keyboard, using RS485 half-duplex serial communications signals. The RS485
connector can also be used to control PTZ (pan, tilt, zoom) cameras or text-in devices.
Connect RX+/TX+ and RX-/ TX- of the control system to the + and – (respectively)
of the DVR. See Chapter 3 ─ Configuration and the PTZ camera, text-in device or
remote controller manufacture's manual for configuring the RS485 connection.
Connector Pin Outs:
RS232 Port
An RS232 port is provided to connect remote control devices such as a control keyboard.
PTZ cameras or text-in devices can also be connected to the RS232 port. See Chapter 3
─ Configuration and the PTZ camera, text-in device or remote controller manufacturer's
manual for configuring the RS232 connection.
NOTE: To make connections on the Alarm Connector Strip, press
and hold the button and insert the wire in the hole below the button.
After releasing the button, tug gently on the wire to make certain it is
connected. To disconnect a wire, press and hold the button above
the wire and pull out the wire.
Alarm In (1 to 8)
GND
COM
NO
Master Unit
+
→
–
→
GND
→
4- & 8-Channel Digital Video Recorder
Alarm Inputs 1 to 8
Chassis Ground
Common
Alarm Out (Normally Open)
Slave Unit
To
→ TX+/RX+
To
→ TX-/RX-
To
→
GND
5
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