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Trimble ThunderBolt E GPS Disciplined Clock User Guide 73
Trimble Standard Interface Protocol A
Command Packet 0x8E-A8 Type 2 Data Format
Command Packet 0x8E-A8 Type 3 Data Format
Command Packet 0x8E-A9: Self-Survey Parameters
Use command packet 8E-A9 to set the self-survey parameters or to request the current
settings. The receiver replies to requests with response packet 8F-A9.
Byte Item Type Description
0 Subcode UINT8 0xA8
1 Type UINT8 2 = recovery mode parameters
2-5 Jam Sync Threshold Single nanoseconds
6-9 Maximum Frequency Offset Single ppb (parts per billion or 1x10-9)
Byte Item Type Description
0 Subcode UINT8 0xA8
1 Type UINT8 3 = initial DAC voltage
2-5 Initial DAC voltage Single Volts
Data field Description
Self-Survey Enable Use this field to enabled or disabled the self-survey mechanism.
0: Disable the self-survey mechanism
1: Enable the self-survey mechanism
Position Save Flag Use this field to tell the self-survey mechanism to automatically save (or
to not save) the self-surveyed position at the end of the self-survey
procedure. This flag also determines how the The receiver will respond
to the saved position it is using for Over-Determined Clock Mode when
the position appears questionable (i.e. if the position may off by a
large amount.) If the flag is set to 0, then a questionable position will
be flagged in packet 0x8F-AC. If the flag is set to 1, then a questionable
position will automatically be deleted.
0: Don't automatically save the surveyed position when self-survey is
complete
1: Automatically save the surveyed position when self-survey is
complete.
Self-Survey Length Use this field to specify the number of position fixes that are to be
averaged together to form the self-surveyed position used for clock-
only fixes. Limits: 1 to (232 - 1) fixes.