User’s Manual
6
Connecting Alarms
Figure 8 — Alarm Input/Output and RS485 connector.
Figure 9 — Alarm Input/Output board and alarm connector strips.
An
Alarm I/O
port (DB-25 male connector) is provided to connect the alarm inputs and alarm
outputs. Connect the wires to connectors on the
Alarm I/O
board (supplied with the unit), and
then connect the board to the
Alarm I/O
port.
CAUTION: Do not attempt to wire directly to the DB-25 male connector.
NOTE: The Alarm I/O Board consists of alarm connector strips and RS485 connector.
AI 1 to 16 (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 is 4.3V and should be stable at least 0.5 seconds to be detected. See
Chapter 3 —
Configuration
for configuring alarm input.
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.
Summary of Contents for SHR-3091
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