Digital Video Recorder
5
CAUTION: When recording video on the iSCSI device, the recoding speed might decrease and the
DVR system performance might be affected if the network devices (network cameras
and network video transmitters) are connected.
eSATA Port
An eSATA port is provided to connect external storage devices for recording or archiving video. Connect
the external eSATA hard disk drive (RAID) cable to the eSATA port.
CAUTION: Do NOT connect or disconnect eSATA devices while the DVR power is on. The DVR must
be powered down to connect or disconnect eSATA devices. Power up eSATA devices
so they are ready for operation before powering up the DVR. Power down eSATA devices
after powering down the DVR and then disconnect eSATA devices.
RS232C Port
RS485 Port
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
Chapter 3
─
Configuration
and the PTZ camera or remote controller
manufacturer’s manual for configuring the RS485 connection.
Alarm Input/Output
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 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 of electrical switches
for NC (Normally Closed) is above 2.4V and for NO (Normally Open) is below 0.3V, and should be stable at least 0.5
seconds to be detected. The voltage range of alarm input is from 0V to 5V. See
Chapter 3
─
Configuration
for configuring
alarm input.
GND (Ground)
: Connect the ground side of the Alarm input and/or alarm output to the GND connector.
NOTE: All the connectors marked GND are common.
NC/NO (Relay Alarm Outputs):
The DVR can activate external devices such as buzzers or lights. Connect the device
to the
C
(Common) and
NC
(Normally Closed) or
C
and
NO
(Normally Open) connectors.
NC/NO
is a relay output
which sinks 2A@125VAC and 1A@30VDC.
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
and
GND
connectors.
An RS232 port is provided to connect a remote control keyboard.
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