Videotec DCT - Manual (Page 17)

Configuration Description Example
Mixed
configuration It is possible to set up mixed
configurations, always bearing in mind the
limits given above:
 each line can have a maximum length
of 1200m
 each line should be terminated at the
ends
 the stubs should be very short (max
2m)
3.3 One keyboard per line: standard connection cable
The connection between the keyboard and the various controlled devices is made only and exclusively using
an RS485 serial channel. .
When the controlled device does not allow for this channel it will be necessary to insert a signal converter (for
example RS485-RS232, or RS485-Current Loop) between the keyboard and the device itself.
A pair of telephone cables and a pair of RJjack shunt boxes can be used to arrive at distances of up to 1200m,
using the following connection diagram:
DCT RJjack1 RJjack2 Device
RS485A white blue RS485A
GND red green GND
RS485B yellow black RS485B
Page 15 of 176 MNVADCT03_0716