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28
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 0.5A@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
(Alarm Reset In) and GND (Ground) connectors.
Connecting USB Ports
Two USB ports on the front panel are provided to connect external hard disk, CD-RW,
or flash drives for video clip copying or system upgrades. Position external drives close
enough to the DVR so that you can make the cable connections, usually less than 6 feet.
Use the USB cable provided with the hard disk drive to connect it to the DVR.
Figure 2-11 USB Ports
A USB mouse (not supplied) can be connected to one of the ports. You can use the
mouse to navigate through the screens and menus much like you would on a computer.
A USB to Serial converter can be connected to the USB port. Multiple text-in devices
can be used with a USB to Serial converter.
Factory Reset
The DVR has a Factory Reset switch to the left of the Alarm Output connectors on the
rear panel. This switch should be used only on the rare occasions that you want to
return all the settings to the original factory settings.
Figure 2-12 Factory Reset Switch