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Lassen-SK8 Embedded GPS Module C-5
Trimble ASCII Interface Protocol (TAIP)
C.3 Time and Distance Reporting
The “D message qualifier allows you to specify a minimum distance traveled as well as a
minimum and maximum time interval for the next report. Units that are stationed at a
fixed location can be programmed to report only when the unit moves “off station or after
a certain elapsed time since last report, but no more often than the specified minimum time
interval.
The message format used with the D qualifier is shown below:
>DAABBBBCCCCEEEEFFFF[;ID=GGGG][;*HH]<
Table C-4. Time and Distance Reporting Message Format Qualifiers
*
Note – If BBBB = 0, then the message output is disabled. If FFFF = 0, maximum time
feature is disabled (the unit will only report if current position is greater than or equal to the
delta distance specified in EEEE).
Example:
When the message: >DPV0030000505000900;ID=0105< is sent to the GPS receiver, it
specifies that vehicle number 105 (GGGG = 0105) is to report the Position Velocity
message (AA = PV) whenever its current position differs from the previously reported
position by at least 500 meters (EEEE = 0500), but no more often than every 30 seconds
(BBBB = 0030) or less often than every 15 minutes (FFFF = 0900 seconds). The
minimum and maximum time-out reports are to be issued with a 5 second offset (CCCC =
0005) from the top of the hour. The optional checksum was not used in this example. The
square brackets, [...], shown in the format description above are used to indicate optional
data. The brackets themselves are never included in the actual TAIP message string.
ID Meaning
> start of message delimiter
D the Distance message qualifier
AA message to report (i.e. PV means Position Velocity message)
BBBB minimum time (seconds) interval between reports (T
interval
)
CCCC report epoch (number of seconds from top of the hour)
EEEE delta distance (meters) from last reported distance
FFFF maximum time (seconds) interval between reports (T
max
)
GGGG optional vehicle identification number (user selected)
HH optional checksum
< End of message delimiter