1、 Front cover plate (dual controller)

　　1. 12V output, controlled by the controller to supply power to the camera, usually without output. Each time a film is taken or in a debugging state, a 12V voltage is sent, with a maximum output current of 300mA. The red color is+12V, and the black color is grounded. If the camera has external power supply, it can be disconnected or used as a relay power supply to control the opening and closing of the external power supply.

　　2. The camera input switch button is used to switch camera selection in debugging mode.

　　2、 Rear cover plate

　　1. Video output: can output the video signal of the current camera during filming or debugging status

　　2. Communication interface wiring:

　　Red:+5V

　　Black: GND

　　Green: RX

　　Blue: TX

　　3、 Self inspection and debugging before installation

　　1. Connect the video output to a regular monitor (it can be replaced by a second-hand small black and white TV, which is compact and convenient for on-site operation).

　　2. Press and hold the search button on the maintenance handle for 2 seconds until the self check symbol appears on the display screen (please refer to the installation manual for details).

　　3. Press the "6" button on the handle in the self check state, and the controller enters the debugging state. The 12V output 1 sends out the 12V power supply, and the monitor displays the video signal of the first camera for detecting the camera, focusing distance, and so on.

　　4. Press and hold the camera input switch button for 1 second, and the controller switches to the next camera for debugging.

　　5. In the debugging state, the monitoring center can still issue commands to capture and transmit images to check the actual shooting effect.

　　6. After debugging, don't forget to exit the host from the self check state.

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