Samsung SSC-5000 - Manual (Page 7)

English _7
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GENERAL FACTS
Back side
Name Function
USB Port This is a software uploading port of the System Keyboard.
Composite Video IN/OUT This is an AV In / Out port.
RS-485 (Port1, 2)
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.
You can specify different protocols for Port 1 and Port 2.
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DC12V IN DC 12V power input terminal