
Installation
21
Siemens Building Technologies
Fire Safety & Security Products 12.2008
NOTE
All the connectors marked GND are common.
Fig. 9 Alarm Output connectors
AO 2 to 16 (Alarm-Out) 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 30mA@12VDC. See Section
8.9.3: Alarm-Out screen.
Fig. 10 Relay Alarm Output connectors
NC/NO (Normally
Closed/Normally Open)
Connect the device to the COM and NC (Normally Closed) connectors or
COM and NO (Normally Open) connectors. NC/NO is a relay output which
sinks 2 A @ 125 V AC, 1 A @ 250 V AC, 1 A @ 30 V DC (NC) and
5 A @ 125 V AC, 2 A @ 250 V AC, 3 A @ 30 V DC (NO).
Fig. 11 Alarm Reset Input connectors
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.
7.6 Connecting to the RS485 port
Fig. 12 RS485 connector
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.
Connect RX+/TX+ and RX-/ TX- of the control system to the + and – (respectively)
of the DVR. See the Section 8: Configuration and the PTZ camera or remote
keybo
ard manual for configuring the RS485 connection.
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