Siemens Building Technologies
Fire Safety & Security Products
Alarm Input connectors
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 16 (Alarm-In)
All the connectors marked GND are common.
Alarm Output connectors
AO 1 to 16 (Alarm-Out)
ARI (Alarm Reset In)
Alarm Reset Input connectors
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.
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 is 4.3 V and should be
stable at least 0.5 seconds to be detected. See Section 8.7.1: Alarm-In
Connect the ground side of the alarm input and/or alarm output to the
The DVR can activate external devices such as buzzers or lights. Connect
the device to the AO (Alarm-Out) and GND (Ground) connectors. AO is an
active low open collector output which sinks 5mA @ 12 V and 30 mA @
5 V. See Section 8.9.3: Alarm-Out screen.