Connecting Alarms; Ai 1 To 4 (Alarm In); Gnd (Ground); Ari (Alarm Reset In) - ADT A-SDR400LTE-80 User Manual

Four-Channel Digital Video Recorder

Connecting Alarms

Figure 7 — Alarm Input connector strips.
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 1 to 4 (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 should be stable at least 0.5 seconds to be detected.
For NO (Normally Open), the threshold voltage is below 0.3V. See Chapter 3 — Configuration for
configuring alarm input.

GND (Ground)

Connect the ground side of the Alarm input to the GND connector.

ARI (Alarm Reset In)

An external signal to the 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 ARI (Alarm Reset In)
and GND (Ground) connectors. The threshold voltage is below 0.3V and should be stable at least
0.5 seconds to be detected. Connect the wires to the ARI (Alarm Reset In) and GND (Ground)
connectors.

Alarm Out

Figure 8 — Alarm Output connector strips.
The DVR can activate external devices such as buzzers or lights. Mechanical or electrical switches
can be wired to the NC (Normally Closed) and C (Common) connectors or NO (Normally Open)
and C (Common) connectors. Permitted current is up to 0.5 A for 125 VAC, 1 A for 30 VDC. See
Chapter 3 — Configuration for configuring alarm output.
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