ashtech DG14, Справочное руководство

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Receiver Commands 119
Receiver Commands
To remain NMEA standard, the GGA message always outputs the elevation for the geoidal elevation
for both ELG and GEO, and the local orthometric elevation for both ELU and UDH and not the
ellipsoidal elevation.
Example
Enter the following command to set geoidal height in the position output.
$PASHS,HGT,GEO
$PASHQ,HGT,c
This command queries the height model selection where c is the optional output
port designator for the output of the response. If a port is not specified, the receiver
sends the response to the current port.
Example
Enter the following command to query the height model to port C.
$PASHQ,HGT,C
$PASHR,HGT
The response message is in the form:
$PASHR,HGT,s*cc<CR><LF>
where s is the 3 character string that denotes the current height setting (ELG, ELU,
UDH, or GEO).