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A-20 Lassen-SK8 Embedded GPS Module
Trimble Standard Interface Protocol
A.17 Packet Descriptions
A.17.1 Command Packet 0x1D
This packet commands the GPS receiver to set or clear the oscillator offset in battery-
backed memory. This is normally used for servicing the unit.
To clear the oscillator offset, one data byte is sent: the ASCII letter 'C' = 0x43.
To set the oscillator offset, four data bytes are sent: the oscillator offset in Hertz as a
Single real value.
A.17.2 Command Packet 0x1E
This packet commands the GPS receiver to clear all battery back-up data and to perform a
software reset. This packet contains one data byte.
I
Caution – All almanac, ephemeris, current position, mode, and communication port setup
information is lost by the execution of this command. In normal use this packet should not
be sent. It is very helpful to keep a fresh copy of the current almanac, which is stored in
the file GPSALM.DAT collected by the TSIPCHAT command “!”. This allows near-
instantaneous recuperation by the receiver in case of power loss or clearing of battery-
backed memory by using the TSIPCHAT command “@” to load it back into the receiver
memory.
.
A.17.3 Command Packet 0x1F
This packet requests information about the version of software running in the Navigation
and Signal Processors. This packet contains no data. The GPS receiver returns Packet
0x45.
A.17.4 Command Packet 0x21
This packet requests current GPS time. This packet contains no data. The GPS receiver
returns Packet 0x41.
Table A-15. Command Packet 0x1E Format
Byte Item Type Value Meaning
0 Reset
Mode
BYTE 0x46
ASCII “F”
Erase BBRAM, reset
nonvolatile memory to factory
default, and restart
0x4B Erase BBRAM and Reset