User's Manual

Jotron AS| TR7750C: Operators Manual  Functional description
Page 3-7
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3.2.8 Rx connector (RJ45)
This connector is normally connected to the REM connector on a mating receiver when used in a
transceiver configuration.
It gives functionality to a transceiver such as: Common 2 wire line interface, received audio in
transmitter local headset, transceiver alarm, TX/RX busy signalling when used as a VDL modem.
Rx connector, transmitter. Interface to RX (transceiver config)
Name
PIN
Purpose
RS485+
1
RS485 (+)
RS485-
2
RS485(-)
LINE_P
3
Diff. line input from Receiver unit, 600 ohm
TX_BUSY
4
TX Busy indicator output (Mute output)
RX_BUSY
5
RX Busy optocoupler-input (Repeater key input)
LINE_N
6
Diff. line input from Receiver unit, 600 ohm
INT_ALARM
7
Low=Alarm (Note: I/O – low input will also be
recognized as an alarm (EXT))
GND
8
Common ground
Table 3.2-5, Rx connector, transmitter, pin out