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User' s Manual
Connecting Alarms
Figure 9 — Alarm connector strip and circuit diagrams
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.
AI (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 G (Ground) connectors. The threshold voltage
is 4.3V and should be stable at least 0.5 seconds to be detected. See Chapter 3 —
Configuration for configuring alarm input.
G (Ground)
NOTE: All the connectors marked G are common.
Connect the ground side of the Alarm input and/or alarm output to the G connector.
AO (Alarm Out)
The DVR can activate external devices such as buzzers or lights. Connect the device to the
AO (Alarm Out) and G connectors. AO is an active low open collector output which sinks
5mA@12V and 30mA@5V. See Chapter 3 — Configuration for configuring alarm output.
ARI (Alarm Reset In)
An external signal to the ARI (Alarm Reset In) can be used to reset both the Alarm Out signal
and the DVR's internal buzzer. Mechanical or electrical switches can be wired to the AI and
G connectors. The threshold voltage is 4.3V and should be stable at least 0.5 seconds to be
detected. Connect the wires to the ARI (Alarm Reset In) and G connectors.
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