Checking The Keyboard Settings; Connecting The Keyboard With The Matrix - Videotec DCBD-DCTEL Manuel D'instructions

6.2.4 Checking the keyboard settings

Keyboard status can be checked at any time during the keyboard programming phase (DIP4 ON).
Check the keyboard address, which is based on Monitor LED status as described in the section on Programming
the Keyboard Address.
Check Video line configuration by pressing the SHIFT key until LED 1-8 flashes. Do not press the SHIFT key if
LED 1-8 is already blinking. Video line configuration is uniquely described by the status of the LED's for the
numeric keys, according to the tables shown in the section on programming the Video Line.
Example:
• LED 1-8 Blinking.
• LED Cam 1/9 on: MACRO protocol for Video line.
• LED Cam 6/14 on: Rate setting, 9600 baud.
Check Telemetry line configuration by pressing the SHIFT key until LED 9-16 flashes. Do not press the SHIFT
key if LED 9-16 is already blinking. Telemetry line configuration is uniquely described by the status of the LED's
for the numeric keys, according to the table shown in the section on programming the telemetry line.
Example:
• LED 9-16 Blinking.
• LED Cam 2/10 on: VIDEOTEC protocol for Telemetry.
• LED Cam 7/15 on: Rate setting, 19200 baud.

6.3 Connecting the keyboard with the matrix

The RJ11 Video line connector present in the circuit is used for reception and transmission of digital data in
RS485, allowing a rapid keyboard connection with matrixes of the type SM42A, SM82A, SM84A, SM164A,
LXRPS42A / LXRPS42TA, LXRPS82A / LXRPS82TA, LXRPS84A, LXRPS164A. These matrixes are also able
to supply remote power (within a limited distance) to the DCTEL / DCBD keyboard, thus making the use of a
local power supply unnecessary (although supplied as standard).
To make a quick connection, we recommend using the supplied telephone cable (approx. 1.5m long): connect
one end of the cable to the RJ11 Video line connector on the keyboard and insert the other in one of the RJ11
connectors on the matrix, marked as KEYBOARDS.
To make connections over greater distances, RJ jack wall boxes can be used with a 4-pole connecting cable
according to the following diagram:
DCTEL / DCBD (RJ11 A or B)
TX-485A White
TX-485B Yellow
+12V Green
GND Red
NB: the keyboard can be remote-powered for a distance of up to 700m (depending on the type of cable used).
For greater distances the keyboard should be powered by a local power supply. The maximum distance allowed
for the RS485 line is 1200m.
It is only possible to connect one DCTEL / DCBD keyboard for each RJ11 connector present in the matrix. It is
not therefore possible to make parallel connections (multi-point) of more than one keyboard to the same RJ11
connector present in the matrix. Use a different RJ11 connector to connect other keyboards.
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MATRIX
Blue RX-485A
Black RX-485B
Red +12V
Green GND
MNVCDCBD01_1729_EN