LTS LTD8304K-ET Quick Start Manual page 10

Digital Video Recorder Quick Start Guide
8 AUDIO IN
9 RS-485
10 Power Supply
11 Power Switch
12 GND
13 Alarm In/Out
RCA connector
Connector for RS-485 devices.
DC 12V power supply.
Switch for turning on/off the device.
Ground.
Connector for alarm input/output.
9