ALT-2 Operating Manual
Page 10
justified zero padded (corrected to local
pressure), L, local pressure setting in
mil/-, four digit VSI reading right
justified zero padded in ft/min, X,
checksum, carriage return
The checksum is a simple modulo 256 sum
of the binary values of the individual
characters. The checksum is sent as two
characters in hexadecimal format
Microair UAV
9600
STX,a,=, five altitude digits right justified
zero padded, ETX
[STX]a=02372[ETX]
STX=0x02
ETX=0x03
CR=0x0D
6 Loading factory default settings
Pressing and holding the F1 and F2 simultaneously on power up will cause the ALT-2 to load preprogrammed factory
default settings. The following screen will be displayed:
7 Operating the alarms
If the alarm is activated, the corresponding item on the display will flash. At the same time the externally available alarm
switch will close. The switch will remain closed until any button is pressed to acknowledge the alarm or until the
condition(s) that activated the alarm no longer exist. The alarm output can be used to switch an external alarm indicator.
The external alarm switch is an open collector transistor switch to ground with a maximum rating of 0.5A DC. It is possible
to wire the alarm contacts of several Stratomaster instruments in parallel should this be desired. To avoid false activation
of the alarms, the alarm function is only active 10 seconds after the instrument has powered up.
8 Cleaning
The unit should not be cleaned with any abrasive substances. The screen is very sensitive to certain cleaning materials
and should only be cleaned using a clean, damp cloth.
Warning:
The ALT-2 is not waterproof, serious damage could occur if the unit is exposed to
water and/or spray jets.
