Videotec DTMRX2 - Manual (Page 42)

Page 16 MNVCDTMRX2_0351
7.10 Connection for reception by coaxial cable (COAX)
The DTMRX2 (DTMRX224) receiver integrates telemetry reception on coaxial cable (RG59 or equivalent). The
maximum distance that can be reached by a coaxial communication is 350 metres (Matrix – Camera distance).
It is not possible to insert video signal amplification devices (video distributors for example). To configure the
system correctly:
• Connect BNC J1 on the receiver (see page 8) to the camera video outlet.
• Connect BNC J2 on the receiver (see page 8) to the video input on the matrix corresponding to the address
setting in the receiver (for example receiver No. 1 will be connected to video input No. 1 on the matrix,
receiver No. 2 to video input No. 2 on the matrix etc.)
• Set DIP switch SW1 for COAX communication (see receiver protocol settings) and set the receiver address
with DIP switch SW2 (see the section on setting the receiver identification number).
• Set the matrix (and the keyboard if necessary) with coaxial type telemetry.
NOTE: COAX communication is only possible with the SMXXA (SM42A, SM82A, SM84A and SM164A) model
matrixes. Refer to its own manual to configure the matrix itself.
7.11 Type of controlled lenses and adjusting the lens control voltage
WARNING: Failure to connect the type of lenses correctly could cause damage to the lenses
themselves.
The DTMRX2 (DTMRX224) is able to control both reverse polarity and common wire lenses. For lenses
operating with a common wire, connect the common wire to FOCUS –
Adjusting the lens control voltage
• insert a load between terminals FOCUS+ and FOCUS- that absorbs at least 10mA (use a resistance sized
between 100 and 1000 ohm).
• connect the power supply cable and power the DTMRX2 or DTMRX224 unit (power supply LED on)
• position the tester prods on terminals FOCUS+ and FOCUS-
• keep the FOCUS NEAR button on the control unit pressed
• adjust the lens control voltage by adjusting trimmer TR1 (see diagram page 8; default 12V
= )
NB: do not adjust a loadless voltage (without inserting the load) otherwise the adjustment will be incorrect.
7.12 Connecting the pan & tilt and lens cables
WARNING : Before carrying out the following operations make sure that the pan & tilt control voltage and
the setting for lens type are correct
• Disconnect the power supply to the unit
• Make the connections with the lens and pan & tilt
• Power the unit
N.B.: We recommend using flexible cables with an appropriate cross section (see the section on cables).