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6.2.13 Connection with the Current
Loop line
The various devices can be connected directly using
the telephone cable supplied by the manufacturer.
For normal connections in the field, refer to the
connections made using the shunt boxes RJ, supplied
by the manufacturer, following the reference tables
given below:
KEyBOARD
TX CL Yellow
GND CL Red
Tab. 02
Current Loop Communication Mode, max. distance
1500 meters from receiver, Jumper JP2 and JP3 in
position CL.
From the receiver side the connection should be
made to terminals RXCL and AGND according to the
following scheme:
To RJ11
keyboard
connector
TX CL (Yellow)
GND CL (Red)
Fig. 15
• If the receiver is connected in cascade to another
EXDTRX3 / EXDTRX324 unit, the reception mode
should be set in Current Loop with jumpers JP2
and JP3 in position CL.
• Terminals RX CL and AGND should be connected
to the preceding unit terminals TX CL and AGND
respectively as in the following scheme:
Current
Loop
From previous
receiver
Fig. 16
EXDTRX3, EXDTRX324
Terminal RX CL
Terminal AGND
Receiver
clamps
CURRENT LOOP
Current
Current
Loop
Loop
To next
receiver
6.2.14 Connection with the RS232 line
Al connettore
RJ11 della
tastiera
Fig. 17
Communication mode RS232, max distance 15m.
6.2.15 Adjusting the voltage of the
optics controls
• Connect the power supply cable and power the
unit (LD1 lit up);
• Insert a load between terminals FOCUS NEAR and
FOCUS FAR to absorb at least 10 mA (use a resistor
from 100 to 1000 ohm);
• Position the tester prods on terminals FOCUS NEAR
and FOCUS FAR;
• Keep one of the two FOCUS keys on the control
unit pressed down;
RX
• Adjust the control voltage of the optics by
AGND
adjusting trimmer TR1 ( default 12Vdc).
TX
AGND
h
Don't make unloaded voltage regulation
(without inserting the load) otherwise the
adjustment will be incorrect.
TX RS232 (Nero)
GND RS232 (Verde)
Morsetti sul
ricevitore
RS232
RX
GND
15
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