U-Link TRx User Guide
Ref.
09-03-V1.0
p
3
This input is protected against reverse polarity, and short transient voltage by a Transil protection.
A light continuously on when the transceiver is powered on. The color of this light is changed according to the selected serial
link mode (RS232
Æ
Green, or RS422
Æ
Red). Corresponding marking of the light shall indicate “ON
Serial link wiring
U- link Trx proposes 2 types of serial link : RS232 and RS422. No hardware flow control is used.
RS232 wiring RS422
wiring
RF Modes
Two RF modes are identified :
•
A UHF transmit only function. This transmitter is used with a Global Navigation Satellite System (GNSS) base station
and broadcast GNSS differential message around the area of the base. The transmitter is available with different
output power( 0.5W, 2W, and 4W). The UHF transmitter is controlled and monitored by the connected GNSS unit
through remote control commands.
•
A UHF relay with receive and transmit functions. This transceiver is able to receive GNSS differential message from a
base, and re-broadcast these data at the same frequency in order to increase the range of the radio link between a
GNSS base and a rover. This transceiver is intended to be used as an autonomous device and can be
controlled and
monitored by software, run on PC.
Switch 1 allows the selection of the mode according the following schemes :
+ DC Supply -.
+
-
ON
ON
1 2
TX-RX
power
Power
ground
ON
TX-RX
RS232
Rx Data
RS232
Tx Data
Signal
ground
ON
1 2
Switch 2 low
(“OFF”) to select
RS232 mode
power
Power
ground
ON
TX-RX
RS422
TX+
Signal
ground
ON
1 2
Switch 2 high
(“ON”) to select
RS422 mode
RS422
TX-
RS422
RX+
RS422
RX-
ON
ON
1 2
TX-RX
RELAY mode
Switch1 low (“OFF”)
ON
TX-RX
TRANSMIT
mode
Switch 1 high
(“ON”)
ON
1 2
