
FASTRAK MANUAL
Rev. G
51
JUNE 2012
computed hemisphere
will be saved (
not
the hemisphere tracking feature) to
the EEPROM. Therefore, sending ‘^K’ during
hemisphere tracking is not
advised.
Relatives:
None.
Default:
The default hemisphere value is: 1,0,0 which is positive X or “forward”
hemisphere. In addition, the hemisphere tracking feature is disabled in the default
condition.
Example 1:
The user may decide to mount the transmitter above the test area in order to be
able to move the receiver to the positive and negative sides of X and the positive
and negative sides of Y. (
NOTE:
since the default hemisphere value is “forward”,
the user cannot move the receiver to the negative X side of the transmitter,
because the signs will flip and it will appear as if the X measurement never goes
negative.) If the transmitter is positioned above the test area, the positive Z or
“lower” hemisphere should be selected. This can be accomplished with the
following command:
H1,0,0,1<>
Station 1 of the FASTRAK will now be set for the positive Z or “lower”
hemisphere.
Although the hemisphere vector is not limited to 1s and Os, the following table of
hemisphere commands may be useful:
Forward Hemisphere (+X)
H1,1,0,0<>
Back Hemisphere (-X)
H1,-1,0,0<>
Right Hemisphere (+Y)
H1,0,1,0<>
Left Hemisphere (-Y)
H1,0,-1,0<>
Lower Hemisphere (+Z)
H1,0,0,1<>
Upper Hemisphere (-Z)
H1,0,0,-1<>
Example 2:
The user may decide to take advantage of the hemisphere tracking feature.
Assuming the system is in the default hemisphere (forward), the following
procedure should be used to enable hemisphere tracking on station 1:
1.
Position the receiver on the positive X side of the transmitter (the side
opposite from where the cable comes out of the transmitter shell) and turn the
system on.
2.
While the receiver is located in the forward hemisphere, send the hemisphere
tracking command to the FASTRAK. The command should be: H1,0,0,0<>
3.
The receiver can now be moved to any side of the transmitter, without
worrying about hemisphere selection.
4.
Do not save this configuration to the system EEPROM (using the ‘^K’
command) because it will save whatever the current computed hemisphere
selection happens to be for that position of the receiver relative to the
transmitter.
5.
If necessary, the user can disable the hemisphere tracking feature by sending a