Videotec DTRXDC - Manual (Page 29)

Page. 9 DTRXDC 2900
Connection to the control unit
The DCS3 keyboard and the receiver DTRXDC can be connected directly using the telephone cable supplied by the
manufacturer and using the RJ11 connector present on the circuit, following the table of reference given below.
The connection DCS3- DTRXDC receiver
Communication mode RS485: max distance 1200
metres
DCS3 (RJ11 A o B) DTRXDC
TX-485A White ------- Blue RX-485A
TX-485B Yellow ------- Black RX-485B
Note: The DTRXDC receiver has the load inserted in reception and is
connected to line A or B on the keyboard, with the load inserted.
At the receiver end it is also possible to make a connection more simply to the terminals RX-485A and RX-485B
according to the following diagram.
Connection of several receivers in cascade
The DTRXDC receivers are able to regenerate, internally, the signal received and retransmit it along a new commu-
nication line to the next receiver. Each of the three lines (L1, L2, L3) can be considered indipendent, and connects
point-to-point only two devices, each of which has the load inserted, with a maximum length of 1200 metres. The
distance between keyboard and receiver D can therefore reach 3600 m (1200 m between keyboard and receiver B,
1200 m between receiver B and receiver C, and a further 1200 m between receiver C and receiver D, total of 3600 m).
DCS3 Phone cable RJjack DTRXDC
RS485A connectors white ------------------------ RX-485A
RS485B RJ11 ‘A’ e ‘B’ yellow ------------------------ RX-485B
DCS3
DCS3