Videotec DTMRX2 - Manual (Page 41)

Page 15 MNVCDTMRX2_0351
7.8.3 Mixed configurations (point-to-point /multi-point)
This is a combination of the two previous connection methods and, depending on the chosen combination,
makes it possible to exploit to the full the advantages of the two types of connection, also significantly reducing
the probability of faulty operation. The following is an example of mixed connection:
In the example shown, if receiver R3
is blocked (connected in multi-point
on line L3) it does not cause a
malfunction in receiver R4.
R3 is not at the ends of line L3 and
therefore should not be terminated.
If receiver R2 fails, because this is the
‘generator’ of line L3 all receivers
connected to it in cascade (R3 and
R4) will not receive the controls.
7.9 Connection with the RS232 line
The DTMRX2 (DTMRX224) receiver can be controlled by means of a RS232 line from a PC or from keyboards
that integrate RS232 communication (DCS2 and DCMT8). Bear in mind that the maximum distance with the
RS232 serial line is 15 metres. Refer to the following connection table.
DCS2/DCMT8
RJ-JACK
DTMRX2
Black Tx RS232 ------------ RX232
Green GND RS232 ------------ GND
For connecting the receivers in cascade, connect terminal RX232 to terminal TX232 of the previous unit and
connect terminal TX232 to terminal RX232 of the subsequent unit. Connect the earths together (GND). In any
case refer to the following connection diagram:
From previous
receiver
To subsequent
receiver