Rugged Cams H.4 - Manual (Page 15)

2-2-2 Connection of Other Devices
Connect the PTZ controller cable, audio input/output, network, and sensors as shown below.
.
Connected Device DVR Terminal
1 PTZ Camera RS485
2 Mic / Speaker Audio Input / Audio Output
3 LAN Cable Ethernet
4 Sensor / Relay DIO (Digital Input/Output)
1) PTZ Camera
For the PTZ camera, connect the control cable of the PTZ camera to the terminal block on
the rear side of the DVR.
Connect the RS485 wire to the terminal block on the rear side of the DVR. Connect TRX+
and TRX-.
2) Audio Input/output
Audio ports are provided; 1 input line and 1 output line are supported.
3) Sensor/Relay
Using wire, connect to the rear side of the DVR in the terminal block form.
In H.4, 4 sensors input and 1 relay output are supported.