ALT+1050000XBAcr
The message starts with “ALT” followed by six characters altitude. The first character is either a
“+” or “-“ if the altitude is negative. This altitude is relative to a local pressure of 1013mB.
This is followed by the character “C” and a further six character altitude. This altitude is corrected
for the current local pressure setting of the instrument. Note that it is possible for the first altitude
to be positive and the second altitude to be negative or vice versa.
This is then followed by the character “L” and a four digit local pressure setting in millibars (mB).
Finally, a five character field shows the current positive or negative VSI reading in ft/min.
This is followed by the character “X” and a two byte checksum in hexadecimal format. Please see
the IIMorrow protocol for checksum details.
The final character is a carriage return (0x13).
Altitudes are transmitted in feet.
Summary of Contents for Stratomaster Maxi Single ALT-3
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