SecurityMan LCDDVR4 - Manual (Page 17)

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5) AUDIO 1/2 IN: Connect up to 4 audio microphone cameras into the audio
input ports. Only one audio port can be active for monitoring and recording.
If one audio input is connected into AUDIO 1 IN and the AUDIO menu is setup
for channel 1, audio will output in channel 1 full screen view and in quad view.
However, if audio input is connected to AUDIO 1 IN and AUDIO menu is setup
for channel 1, viewing channel 2/3/4 in full screen will mute the audio output.
6) PS2 MOUSE: Use this port for PS/2 mouse connection. If you have USB port
mouse, use USB - PS/2 adapter to connect with this port.
7) HDD Bracket: The HDD bracket is use to mount the system hard disc drive.
8) VIDEO INPUT: connect up to 4 cameras into the corresponding video input
ports. Video input is BNC connector interface, converters required for RCA
interface cameras.
9) RS485/ SENSOR/ ALARM:
RS485
The first two terminals from left to right is the RS485 power line ports use for
protocols camera. RS485 two terminals are – and +. Only two protocols
are supported, Pelco-P or Pelco-D protocols camera with RS485 terminal
to integrate.
ALARM
This is an alarm input terminal use to connect dry contact of an output device
such as a siren, spot light and etc. The output device requires having its own
power to integrate. The alarm terminal does not provide any power to the
output device.
SENSOR
There are 4 sensor input terminals total, in which up to 4 sensors can be con
nected to the DVR. Each sensor input consists of 2 terminals, because it is a
relay terminal. The input terminals can be configured to trigger video record-
ing. If the input is motion detection, motion can also be configured to trigger
video recording.
Note: Mount the ground cable (green) to the GND screw located below the Power
switch and secure the other end of the ground cable to a ground source.
Grounding the DVR will help to prevent surge and protection from other
unknown static.