PNI SeaTRAX - Manual (Page 52)

PNI Sensor Corporation DOC#1018154 r02
SeaTRAX User Manual Page 47
7.3.9 kSave (frame ID 9
d
)
This frame commands the SeaTRAX to save internal configurations and user calibration
coefficients to non-volatile memory. Internal configurations and user calibration
coefficients are restored on power up. The frame has no payload. This is the ONLY
command that causes the device to save information to non-volatile memory.
7.3.10 kStartCal (frame ID 10
d
)
Before proceeding with this section, ensure you are familiar with Section 5. Also, note
the following:
Multiple sets of calibration coefficients can be saved using kMagCoeffSet and
kAccelCoeffSet. These different coefficient sets can be used for storing coefficients
for varying conditions, such as when a door is open or closed, or when the
temperature varies, since the magnetic signature of the host system may change over
temperature.
Immediately after performing a successful calibration the new calibration coefficients
will be will be stored in volatile memory and immediately applied. Save this
coefficient set to non-volatile memory by sending kSave. If you do not want to use
this new coefficient set, either reboot the SeaTRAX (which will restore the prior
coefficients), switch to a different coefficient set, or reload the factory coefficients.
On powering up, the last saved calibration coefficients will be loaded.
This frame commands the module to start a user calibration. After sending this
command, the module ensures a PNI-established stability condition is met, takes the first
calibration point, and then responds with kUserCalSampCount. kUserCalSampCount
will continue to be sent after each sample is taken. Subsequent samples will be taken
when autosampling when the minimum change and stability conditions are met, or
manually after the kTakeUserCalSample is sent and the stability condition is met.) See
Section 5 for more information on the various calibration procedures.
Note: The payload needs to be 4 bytes. If no payload is entered, or if less than 4 bytes are
entered, the unit will default to the previous calibration method.
Cal Option
UInt32
Payload