PNI TCM - Manual (Page 58)

PNI Sensor Corporation DOC#1014688 r06
TCM User Manual – July 2013 Page 53
7.3.16 kSaveDone (frame ID 16
d
)
This frame is the response to kSave frame. The payload contains a UInt16 error code: 0
indicates no error; 1 indicates an error when attempting to save data to memory.
7.3.17 kUserCalSampleCount (frame ID 17
d
)
This frame is sent from the TCM after taking a calibration sample point. The payload
contains the sample count with the range of 1 to 32.
7.3.18 kCalScore (frame ID 18
d
)
The calibration score is automatically calculated and sent after taking the final calibration
point, although it may take >1 minute for the score to be calculated. The payload is
defined below, and the payload components are discussed after this.
MagCalScore:
MagCalScore provides an over-riding quality indicator of the magnetometer
calibration. Acceptable scores will be ≤1 for Full-Range Calibration, ≤2 for other
methods. Note that it is possible to get acceptable scores for DistError and TiltError
and still have a rather high MagCalScore value. The most likely reason for this is the
TCM is close to a source of local magnetic distortion that is not fixed with respect to
the device. In the event of an aborted calibration the score will be 179.8d, or in the
event of an accel-only calibration the score will be 99.99d.
AccelCalScore:
This score represents the over-riding quality of the accelerometer calibration. An
acceptable score is ≤1. In the event of an aborted calibration the score will be 179.8
d
,
or in the event of a mag-only calibration the score will be 99.99
d
.
Payload
MagCalScore
Float32
Reserved
Float32
AccelCalScore
Float32 Float32 Float32 Float32
DistError TiltError TiltRange
SampleCount#
UInt32
Payload
Error Code
UInt16
Payload