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Acutime 2000 Synchronization Kit User Guide A-119
A Trimble Standard Interface Protocol
Minor Alarms: This field is bitwise encoded with several minor
alarm indicators. A minor alarm indicates a condition that the user
should be alerted to, but does not indicate an immediate (or
necessarily any) impairment of functionality. For each bit, a value of
0 means that the condition is not indicated. Bits not described below
should be ignored.
Bit 1 Antenna Open (ACE UTC only)
Bit 2 Antenna Short( (ACE UTC only)
Bit 3 When 1, indicates that no satellites are yet usable. In order for a
satellite to be usable, it must be tracked long enough to obtain
ephemeris and health data.
Bit 5 When 1, indicates that a self-survey procedure is in progress.
Bit 6 When 1, indicates that there is no accurate position stored in
EEPROM.
Bit 7 When 1, indicates that the GPS system has alerted the GPS that
a leap second transition is pending.
Bit 8 When 1, indicates that the GPS is operating in one of its test
modes.
Bit 9 When 1, indicates that the accuracy of the position being used
for a time-only fix is questionable. While operating in the
Overdetermined Clock mode (which is most of the time) with at
least 2 satellites available, the receiver can detect position
inaccuracies as small as 1/2 to 1 mile. If this bit is set, it is likely
that the receiver is using a stored position but has been moved
to a new site. The stored position should be cleared (packet
0x8E-45) and a new position should be established either by
user input (packet 0x31 or 0x32) or by self-survey
(packet 0x8E-A6).
Bit 10 When 1, indicates that one or more EEPROM segments where
found to be corrupt at reset and had to be set to their factory
default settings. Use packet 0x3F-11 to retrieve details about
which segments where corrupt and to clear this bit. The GPS
will send packet 0x5F-11 with the segment status. Only bits 2-
12 of the segment status are used to set this alarm bit.
Bit 11 When 1, indicates that the almanac is not current or complete.