Win4NET H.264 8-Channel Mobile DVR User Manual page 18

Power and communication port
Use UTP Cable to connect to main unit.
RS485/RS232/SPEED PULSE input port
Alarm Output
Vehicle Status input port
Sensor Input port
Connect speed pulse of the vehicle. Use provided accessory cable.
this also can be used when connect RS-485/232 communication.
Connect alarm output to external devices. Addition power supply
required because this alarm is 'Open-collector' type.
Connect Vehicle Status with provide accessory cable.
Connect to external devices with accessory cable. Event signal
can be sent to DVR.
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