12713020-002-2 Revision D – April 2004 SSU-2000 User’s Guide 287
TL1 Command Interface
RTRV-GPS-POS:[tid]:[aid]:ctag;
Valid aid code: S1A3 or S1A5 (must be a GPS module)
This command returns the settings position mask for the
GPS module designated by the aid.
The format for each response message line is:
^^^"aid:lat,lon,hgt,pdop,mode,avg,posel,timel"
<cr lf>
where:
lat = current latitude of the receiver in the format
(DD)-MM-SS:SS
lon = current longitude of the receiver in the format
(DD)-MM-SS.SS
hgt = current height of the receiver in meters
pdop = current Position Dilution of Precision or pdop
mask [1 through 10]. Pdop is a measurement that
indicates the geometry of the GPS satellites that the
SSU-2000 is tracking. Lower values indicate better
geometry.
mode = GPS positioning mode is user-specified or
calculated: [User|Calc]. If the positioning mode is set to
User, the configuration setting is sent to the GPS engine
and the mode is set to a fixed position. When the
positioning mode is set to Calc, the elevation mask
setting for positioning is sent to the engine, the engine is
set to positioning mode, and 10 positions are averaged
and compared to the configuration setting. If there is a
greater than 300 meter error, the unit recalculates the
position based on the averaging count. If there is not
such an error, the unit uses the stored position. The
SSU-2000 generates an event when the GPS module
calculates a new position, and stores the new position in
NVRAM as the current position and changes the engine
mode to fixed position.
avg = current GPS position averaging count. Setting the
averaging count generates an event and starts a new
position fix automatically.
posel = minimum satellite elevation to use for positioning
timel = the minimum satellite elevation to use for timing
RTRV-HDR:[tid]::ctag;
Valid aid code: none.
This command is used to verify system connectivity. It may
also be used to retrieve the unit name (sid) and date and
time. The only action taken by the SSU-2000 is to respond
with the complied message.
Table B-5. TL1 Retrieve Commands (Continued)
Command Description
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