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This command is used to enable Position Hold and set the reference (held) position for
timing. The entered reference position will be used until it is changed by a subsequent
command, or until the module is given a system reset. It can also be used to disable Position
Hold, but note that the position fields must be populated even when Position Hold is being
disabled.
Note that if the auto-survey algorithm is in the process of estimating a reference position, the
user entered reference position will be overridden by the estimate when the algorithm
completes its calculation. Refer to section 3.2.7 for more information regarding the auto-
survey algorithm.
Synopsis
:
$PSTMENABLEPOSITIONHOLD <OnOff>,<Lat>,<N/S>,<Long>,<E/W>,<Alt>
<cr><lf>
Parameter Format
Description
OnOff
One digit decimal
0 – Position Hold will be disabled
1 – Position Hold will be enabled
Lat
DDMM.MMMM
Latitude (DegreesMinutes.FractionalMinute)
N/S
‘N’ or ‘S’
Latitude direction (North or South)
Long
DDDMM.MMMM
Longitude (DegreesMinutes.FractionalMinute)
E/W
‘E’ or ‘W’
Longitude direction (East or West)
Alt
dddddd.dd - Signed
decimal, up to 8 digits
Mean Sea Level (MSL) altitude in meters, range -1500
to 100000
If the OnOff field is set to ‘1’ and the command is successful, the SL869-T uses the position
provided in the command as the reference position and responds with the following message:
$PSTMPOSITIONHOLDENABLED*49<cr><lf>
If the OnOff field is set to ‘0’ and the command is successful, the SL869-T responds with the
following message:
$PSTMPOSITIONHOLDDISABLED*1C<cr><lf>
However, if an input parameter is missing or is not a valid value, the SL869-T responds with
the following message:
$PSTMENABLEPOSITIONHOLDERROR*55<cr><lf>
The Position Hold feature remains in the previous state when an error occurs.