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<Esc> %
Change Escape Character for compass, default=27=ESC *careful* This
is used to change the compasses ESCAPE character for applications
where the compass may be on a shared output line and the system may
send ASCII=27 characters. If you change it you will not be able to talk
to the compass unless you can send the new character.
<Esc> F
Restore Factory Defaults and calibration
<Esc> T
Accelerometer Calibration, requires accurate placement of the compass
in 6 orthogonal angles. This is a factory test and generally never
required to be done in the field.
<Esc> $
Soft Iron Compensation. The values are 0=disable, 1=enable,
2=generate calibration. When you enter generate (2) you need to have
the system with the compass in installed and freshly calibrated, (via the
<esc>C,<esc>Z commands). You will need to align the system to
cardinal points according to a magnetic compass, N,S,E,W in an area
free of magnetic disturbance.
Note: You must have deviation set to 0 before this operation,
<esc>Q0<enter>
The soft iron compensation method uses the deviation coefficient
finding method described by Archibald Smith to the Royal Society in
1855. Soft Iron Compensation is supported with firmware version 1.4.
<Esc> S
Degauss every 'n' sentences. This sets the frequency of the sensor
degauss and offset operations. The default value is something around 1
second. The quicker you degauss the lower the compass lag is when
moving it quickly.
Important Note:
Some commands may not be available in earlier firmware releases.
Compass Mounting Guidelines
In general you should mount the compass in a location in your vehicle or device that
has the least disruption to the earths magnetic field.
1) Mount away from permanent magnets such as motors. The fields fall off as
inverse square of the distance so doubling the distance reduces the field
strength by ¼.
2) Mount the compass away from moving magnetic fields such as wires carrying
current, moving magnets, generators, etc.
3) Mount the compass as far as possible from batteries and ferrous materials such
as soft iron.
