PNI CompassPoint V2Xe - Manual (Page 19)

PNI Sensor Corporation DOC#1017814 r01
V2Xe User Manual – May 2012 Page 17
Table 5-4: Component Identifiers
Component Component ID Format Units
kXRaw 0x01 SInt32 counts
kYRaw 0x02 Sint32 counts
kXCal 0x03 Float32 scaled to 1.0
kYCal 0x04 Float32 scaled to 1.0
kHeading 0x05 Float32 degrees
kMagnitude 0x06 Float32 scaled to 1.0
kTemperature 0x07 Float32 °C
kDistortion 0x08 Boolean True or False
kCalStatus 0x09 Boolean True or False
Component types are listed below. All are read-only values.
kXRaw & kYRaw (Component IDs 1
d
& 2
d
)
These values are the raw sensor counts as read from the ASIC registers.
kXCal & kYCal (Component IDs 3
d
& 4
d
)
These are the X and Y components of the magnetic vector after the calibration
coefficients have been applied to the raw values. Their values are used to
calculate the heading.
kHeading (Component ID 5
d
)
Provides compass heading calculated from kXCal and kYCal, where the heading
range is 0.0˚ to +359.9. kHeading will equal -1.00 if kCalStatus is True.
kMagnitude (Component ID 0x06)
The value is calculated using the formula Magnitude = SQRT (XCal2 + YCal2).
Its value is compared to the calibration magnitude to determine distortion.
kTemperature (Component ID 0x07)
The V2Xe’s internal temperature sensor provides the temperature value, in °C.
kDistortion (Component ID 0x08)
This flag indicates if the magnitude of the vector used to calculate the heading is
below 50% or above 150% of the calibration magnitude.
kCalStatus (Component ID 0x09)
This flag indicates the user calibration status. True means it is not user calibrated
and this is the default value.
kGetData (frame ID 0x04)
This frame queries the V2Xe for data. The frame has no payload. The response is
kGetDataResp.