Rugged CCTV Workhorse 120-8, Operating Instructions & User Manual, Page: 13 / 145

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sensor, or sound) on full screen. Events are checked every second; if events are detected in multiple
channels, the video of the channel with the latest event is displayed.
(3) Audio input/output
There are four audio input ports, one line output port, and one speaker output port.
(4) Sensor/Relay extension board
Connect the sensor/relay extension board to the DIO port on the rear side of the system using a D-
SUB 25-type extension cable.
A) External sensor connection option
The sensor/relay extension board consists of 16 sensor input ports and 4 relay output ports.
Sensor/Relay extension board
Sensor input port
Up: 1~8
Down: 9~16
Connecting the external sensor
Connect the external sensor cables to S1 ~ S16 and the input port of the sensor/relay
extension board module with symbol.
Each input port may be used regardless of the channel number.
Example - Connecting three external sensors
Connect the external sensor cable to the sensor input ports as shown below:
External Sensor Input Port Ground Port
Sensor1 S1 GND
Sensor1 S3 GND