4 more than two devices on the same line – Videotec DCT User Manual
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3.4 More than two devices on the same line
The presence of more than one keyboard and/or receiver devices (video matrixes, telemetry receivers, DVR's,
MUX's, etc.) on the same communication line requires the use of RJjack shunt boxes connected appropriately.
As specified in section §3.2 - RS485 and types of systems, page 14, it is necessary to identify the two devices
representing the ends of the line and terminate them appropriately (to terminate the keyboard, see §2.5 - DIP
switch, page 11). Pay special attention to the length of the stubs.
Transmitter
device(keyboard)
Transmitter side
RJjack
Receiver side RJjack
Receiving device
RS485A
white
See the specific section for
each device
RS485A
GND
red
See the specific section for
each device
GND
RS485B
yellow
See the specific section for
each device
RS485B
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