Specifications
Command/Response Formats 221
Commands
Example: Set datum parameters
$PASHS,UDD,0,637 8240, 297.323, 34.23, 121.4, 18.9, 0, 0, 0, 0 <enter>
$PASHQ,UDD,c
Query the user datum parameters where c is the optional output port and is not
required to direct the response message to the current communication port.
Example: Query datum parameters to port C
$PASHQ,UDD,C <enter>
$PASHR,UDD
The response is in the format.
$PASHR,UDD,d1,f2,f3,f4,f5,f6.f7,f8,f9,f10*cc <enter>
Where the Parameters are defined in Table 6.153 on page 220.
UDG: User-Defined Datum to Grid Transformation
$PASHS,UDG,s1,d2,f3,f4,f5,f6,f7,f8,f9,f10,f11,f12,f13
Sets the user-defined datum to grid transformation parameters in the receiver
memory. The number of parameters depends on the map projection type selected and
must be indicated by the user as parameter d2.
f3 Inverse Flattening in meters. 290.0000000-
301.0000000
meters 298.257223563
f4 Translation in x direction* ±1000.000 meters 0.00
f5 Translation in y direction* ±1000.000 meters 0.00
f6 Translation in z direction* ±1000.000 meters 0.00
f7 Rotation about x axis*
+ rotation is counter clockwise, and -
rotation is clockwise rotation, about the
origin.
±10.000 sec 0.000
f8 Rotation about y axis* ±10.000 sec 0.000
f9 Rotation about z axis* ±10.000 sec 0.000
f10 Delta scale factor (scale factor = 1 + delta
scale factor)
±25.000 PPM 0.0000
* Translations, rotations, and scale factors are entered as going from local datum to WGS84
Table 6.153: UDD Message Structure (continued)
Param
eter
Description Range Units Default