User’s Manual
6
GND (Ground)
NOTE: All the connectors marked GND are common.
Connect the ground side of the Alarm input and/or alarm output to the
GND
connector.
AO 1 and 4 (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 5mA@12V
and 30 mA@5V.
See
Chapter 3 — Configuration
for configuring alarm output.
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.
Connecting to RS485
Figure 10 — 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+
and
TX+
of the control system to the
RX+
/
TX+
of
the DVR, and
RX-
and
TX-
to the
RX-/TX-
. See
Chapter 3 — Configuration
and the PTZ camera
manufacture’s manual for configuring the RS485 connection.
Connecting to the Network Port
Figure 11 — Network connector.
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