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A-2 Lassen-SK8 Embedded GPS Module
Trimble Standard Interface Protocol
This document describes in detail the format of the transmitted data, the packet
identification codes, and all available information over the output channel to allow the
user to choose the data required for his particular application. As will be discussed, the
receiver transmits some of the information (position and velocity solutions, etc.)
automatically when it is available, while other information is transmitted only on request.
Additional packets may be defined for particular products and these will be covered in the
specifications for those products as necessary.
The TSIPCHAT utility, part of the GPS Tool Kit, is designed to exercise many of the TSIP
packets. The GPSSK Utility, part of the GPS Took Kit, is designed to exercise many of the
TSIP messages.
A.2 Automatic Output Packets
The Lassen-SK8 receiver module is configured to automatically output the following
packets. For minimal system implementations, these output packets provide all of the
information required for operation including time, position, velocity, and receiver and
satellite status and health. Position and velocity are reported using one or more of the
packets listed below, depending on the selected I/O options. While there are other packets
automatically output, the following packets provide the information most commonly used.
No input packets are required.
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Note – See page A-16 for a detailed description of the key receiver setup parameters.
Table A-1. Automatic Output Packets
Output Packet ID Description
Reporting
Interval
0x41 GPS time 5 seconds
0x42, 0x83, 0x4A,
0x84, 0x43, 0x56,
0x8F-17, 0x8F-18,
0x8F-20
position (choose packet with I/O options) 1 second
0x43, 0x56, 0x8F-20 velocity (choose packet with I/O options) 1 second
0x46 health of receiver 5 seconds
0x4B machinecode/status (includes antenna
fault detect)
5 seconds
0x6D all-in-view satellite selection 1 second
0x82 DGPS position fix mode (only in DGPS
mode)
1 second