Samsung SSC-5000 User Manual page 7

Back side
Name
USB Port
Composite Video IN/OUT
RS-485 (Port1, 2)
DC12V IN
This is a software uploading port of the System Keyboard.
This is an AV In / Out port.
For RS-485 communication, it will be connected to the RS-485 terminals of other System
Keyboards or controlling devices such as cameras, and DVR.
M
You can specify different protocols for Port 1 and Port 2.
DC 12V power input terminal
Function
English _7