Videotec DTRXDC User Manual download pdf (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

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Videotec DTRXDC User Manual Page 29