7. Telemetry Operation
With
the
telemetry
option
enabled,
the
OpenTracker
will
transmit
an
APRS
‐
formatted
telemetry
packet
after
each
position
packet:
T#011,155,218,000,000,000,00000000
Six
three
‐
digit
fields
follow
the
‘T#’
header.
Each
field
has
a
range
of
zero
to
255.
The
fields
are
interpreted
as
follows:
Sequence
number:
Incremented
with
each
transmission.
ADC0:
Multiply
by
1.9608
for
temperature
reading
in
kelvins.
ADC1:
Divide
by
17
for
supply
voltage
reading
in
volts.
ADC2:
Divide
by
51
for
auxiliary
analog
input
reading
in
volts.
Counter:
Low
eight
bits
of
the
digital
counter
input.
HDOP:
Divide
by
10
for
GPS
horizontal
dilution
of
precision
reading.
Of
the
final
eight
‐
digit
field,
only
two
binary
digits
are
used
–
the
rightmost
bit
reflects
the
jumper
input,
and
the
next
bit
indicates
the
configuration
profile
in
use.
OpenTracker Manual - Version 1.05 – 6/25/06
page
16
of
23
