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A-24 Acutime 2000 Synchronization Kit User Guide
Trimble Standard Interface Protocol
A
0x27 Command Packet 27
Signal Levels Request
This packet requests signal levels for all satellites currently being
tracked. This packet contains no data. The GPS receiver returns
packet 47.
0x28 Command Packet 28
GPS System Message Request
This packet requests the GPS system ASCII message sent with the
navigation data by each satellite. This packet contains no data. The
GPS receiver returns packet 48.
0x29 Command Packet 29
Almanac Health Page Request
This packet requests the health page from the almanac. This packet
contains no data. The GPS receiver returns packet 49.
0x2A Command Packet 2A
Altitude for 2-D Mode Command
This packet provides the altitude to be used for Manual 2-dimensional
navigation mode. This altitude is also used for Auto 2-D mode. This
packet contains one SINGLE number (4 bytes) specifying the altitude
in meters, using the WGS-84 model of the earth or MSL geoid
altitude, depending on I/O options (set by packet 35). The GPS
receiver returns packet 4A. It is recommended that the user upload the
reference altitude before the receiver starts doing position fixes.
If an altitude is not provided, the receiver will use the altitude of the
previous 3-D fix (altitude-hold mode). Sending packet 2A with one
data byte equal to 0xFF will cancel altitude-set mode and return the
reference altitude to 0. The altitude setting is stored in non-volatile
memory. Packet 0x8E-26 can be used to write receiver configuration
to EEPROM.