Videotec SM82A - Manual (Page 50)

Page 12 MNVCSM42A_0408
Connect the telephone cables as in the following diagram:
Connecting RS 485 KEYBOARD lines
MATRIX RJ-jack 1 RJ-jack 2 KEYBOARD
RS485-A Blue ----------------- White RS485-A
RS485-B Black ----------------- Yellow RS485-B
12 VDC (1) Red ----------------- Green 12 VDC
GND (1) Green ----------------- Red GND
(1) powering the keyboards from the matrix is only possible with the DCTEL and DCBD keyboards and with the
LXRPK12 and LXRPK23 Linxs series keyboards and in any case, up to a maximum distance of 700m
3.5.4.2 Telemetry rec eivers (AUX line)
All the receivers specified in section 2.2 Connectable devices and the SM42A / SM82A video matrix can be
connected by telephone cable using the RJ-11 socket called AUX.
They can be connected directly using the 1.5m cable (supplied by the manufacturer) for a test or, for longer
distances, using the RJ-jack wall-mounted boxes (supplied by the manufacturer) and referring to the following
table:
RS 485 matrix (AUX line) – Receiver connection
MATRIX RJ-jack 1 RJ-jack 2 RECEIVER
RS485-A White ----------------- Blue RS485-A
RS485-B Yellow ----------------- Black RS485-B
All the receivers should be set up for RS485 communication mode and with a transmission rate that is
compatible with the setting made for the matrix at the programming stage.
See the respective manuals for configuring the receivers.
There are two possible ways of connecting the receivers to the AUX line:
• Receivers in cascade (Point-to-point connection)
• Receivers on the same line (Multi-point connection)