CCTV Camera Pros VM-16RT Video Multiplexer for CCTV - Manual (Page 6)

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2.Rear Panel Installation
16 Split system
Camera Connection
Accept 16 loop composite video inputs from the camera.
Monitor Connection
Provide 1 composite video output for the main monitor.
VCR OUT Connection
Provide 1 composite video output for recording in the VCR.
VCR IN Connection
Accept 1 composite video input for playback from the VCR.
AUDIO IN Connection
Accept 4 composite audio inputs from the camera.
AUDIO OUT Connection
Provide 1 composite audio output for the main monitor.
RS485 / RS-232 Connection
Provide RS485 interface to control camera.
Provide RS-232 interface to be controlled by HOST.
Power Switch
1 : ON
○ : OFF
Power Jack Connection
DC 12V/1.5A, Center is positive