Specifications

218 Z-Family Technical Reference Manual
DTM: Datum Selection
$PASHS,DTM,s
Select the geodetic datum used for position computation and measurements, where s
is a 3 character string that defines a pre-defined datum or UDD (User Defined
Datum). Parameters for user defined datum are entered with the $PASHS,UDD
command (page 220). W84 is the default. For the list of available predefined datums,
Appendix A, Reference Datums and Ellipsoids.
Example: Select user defined datum for position computation.
$PASHS,DTM,UDD <enter>
This does not affect the position output in the B-file or in the PBN message which are ECEF and
always with respect to WGS-84.
$PASHQ,DTM,c
Query datum setting where c is the optional output port.
Example: Query the DTM status to port C.
$PASHQ,DTM,C <enter>
$PASHR,DTM
The response message is in the form:
$PASHR,DTM,s*cc <enter>
where s is the 3 character string that denotes the current datum setting. For the list of
available datum, see Appendix A, Reference Datums and Ellipsoids.
Transformation charts, including DMA, list the datum transformation parameters as “from” local
→ “to” WGS-84. This format is used for the UDD interface and the parameter signs are
automatically inversed before the transformation is executed.
FUM: Fix UTM Zone
$PASHS,FUM,c
This command will enable/disable the fixing of the UTM zone, where c is either Y
(enable) or N (disable). The default is N. This command is mostly used when the user
is near a UTM boundary and outputing position in UTM coordinates and does not
want the UTM coordinates to suddenly shift from one zone to another if the boundary
is crossed. Use the $PASHS,FZM command to set the zone that will be fixed.
Example: Select the UTM zone to be fixed.
$PASHS,FUM,Y <enter>