PNI FieldForce Trax - Manual (Page 55)

PNI Sensor Corporation DOC#1016505 r06
TRAX User Manual Page 51
7.6 Calibration Commands
7.6.1 User Calibration Commands
First, note that in order to perform a user calibration, it is necessary to place the TRAX in
Compass Mode, as discussed in Section 7.7. Note that TRAX allows for a maximum of
12 calibration points.
kStartCal (frame ID 10
d
)
This frame commands the TRAX to start user calibration with the current sensor
acquisition parameters, internal configurations and FIR filter settings.
Note: The payload needs to be 32 bit (4 byte). If no payload is entered or if less than 4 bytes
are entered, the unit will default to the previous calibration method.
The CalOption values are given below, along with basic descriptions of the options.
Full-Range Calibration
Recommended calibration method when >45° of tilt is possible. Can be used for
between 20° and 45° of tilt, but accuracy will not be as good
2D Calibration
Recommended when the available tilt range is limited to ≤5 °. Can be used for 5°
to 10° of tilt, but accuracy will not be as good.
Hard-Iron-Only Calibration
Recalibrates the hard-iron offset for a prior calibration. If the local field hard-iron
distortion has changed, this calibration can bring the TRAX back into
specification.
CalOption
UInt32
Payload CalOption Payload Value:
“10
d
” or “0A
h
”: Full-Range Calibration (default)
“20
d
” or “14
h
”: 2D Calibration
“30
d
” or “1E
h
”: Hard-Iron-Only Calibration
“40
d
” or “28
h
”: Limited-Tilt Calibration
“100
d
” or “64
h
”: Accel-Only Calibration
“110
d
” or “6E
h
”: Mag-and-Accel Calibration
2
Heading ID ID Count
Payload
Heading
(Float32)
Heading
Status ID
Heading
Status (UInt8)
5 359.9 79 1