Rs232 interface, Input interface, 2~9: audio input – RGBLink VSP 112U User Manual
Page 27: Usb input, 22: vga input, Dvi input, Hardware orientation, Rs232, Interface, 21: cvbs input

2. Hardware Orientation
VSP 112U Back Panel
VSP 112U User Manual 27
Used to connect the windows control program or device upgrade.
13: RS232
Interface
Used to connect the windows control program or device upgrade.
INPUT Interface
It includes 2 CVBS inputs by BNC interfaces, 2 USB interface (USB1 is in
the front panel), 1 DVI-I interface, 2 VGA input by DB15 interface, and 4
balanced analog audio Inputs.
2~9: Audio Input
Audio input, receive the audio signals from the audio signals of the DVD
player, hardware player and digital box.
19: USB Input
USB input interface, can access the USB device or mobile hard disk with
USB storage function. Support general image formats.
20. 21: CVBS Input
CVBS input, input standard video signal from players, cameras etc.,
supported resolution 480i and 576i via BNC. Supported standards include:
PAL, NTSC and SECAM.
1. 22: VGA Input
VGA interface, input the video signal from HD player and computer, etc.
Compatible with YPbPr via the DB15 interface.
23: DVI
Input
DVI input, input the video signal from computer, DVI signal generator. Can
be compatible with HDMI 1.3.
(This connection can not support hot-plugging).