Operating instructions

3.3 One keyboard per line: standard connection cable
The connection between the DCT 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 RJjack 1 RJjack 2 Device
RS485A white blue RS485A
RS485B yellow black RS485B
3.4 More than two devices on the same line
The presence of more than one keyboard 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, pag.14, it is
necessary to identify the two devices representing the ends of the line and terminate them appropriately (to
terminate the DCT keyboard, see §2.5 - DIP switch, pag.12). Pay special attention to the length of the stubs.
Transmitter device
(keyboard)
Receiving device (video
matrix , telemetry receiver
RS485A - white ----------------------------- blue - RS485A
RS485B - yellow ----------------------------- black - RS485B
Page 17 of 193 MNVADCT_0409