LT-300 User & Installation Manual
Connecting
Lars Thrane A/S
www.thrane.eu
24 of 39
Connecting LT-Service Tool
The LT-Service Tool is a PC program made for configuration, maintenance, and service of the LT-300 GNSS
Receiver. Use of the LT-Service Tool is optional. For details and functionality, see Configuration using LT-
Service Tool on page 26. This sub-chapter is describing how to physically interconnect a PC (with the LT-
Service Tool), to a LT-300 GNSS Receiver. The LT-Service Tool is using the NMEA 0183 interface for
communicating with the LT-300 GNSS Receiver (both Tx and Rx directions).
Use either a ‘USB to RS-422 converter’ or connect a serial port directly to the LT-300 GNSS Receiver as
described in the following sub-sections. The LT-300 GNSS Receiver requires an input voltage of 9-40 VDC.
Most of the USB to RS-422 converter’s and serial interfaces are only providing 5 VDC. Make sure that GND on
both devices (PC and LT-300 GNSS Receiver) are connected to the same reference.
NOTE:
The LT-Service Tool will automatically detect all LT-Navigation devices, which are connected to
the PC’s peripheral interfaces (USB and serial). Make sure that Tx and Rx wires are connected
correctly. The LT-Service Tool will automatically try both 4.800 and 38.400 baud to search for
possible LT-Navigation devices. If the LT-Service Tool does not automatically detect a LT-
Navigation device, check automatically and manual connection modes, described in
Configuration using LT-Service Tool on page 26.
USB to RS-422 converter
A standard USB to RS-422 converter, as illustrated in Figure 38, is perfect for providing a communication link
in between the LT-Service Tool and the LT-300 GNSS Receiver. The PC is connected to the ‘USB to RS-422
converter’ through a standard USB cable.
NOTE:
Windows may wrongfully recognize an USB to Serial device, as a mouse, if the device is
transmitting when being plugged into the PC. Avoid this by giving Windows time to recognize
the USB to Serial device before powering on the LT-300 GNSS Receiver.
F
IGURE
38:
USB
TO RS
-422
CONVERTER PROVIDING THE COMMUNICATION LINK IN
BETWEEN THE
PC
(LT-S
ERVICE
T
OOL
)
AND THE
LT-300
GNSS
R
ECEIVER
.
Содержание LT-300
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