Garmin GDL 88 Installation Manual page 39

B.1.4 Shadin Altitude Sentence
The GDL 88 is capable of receiving the following 17-byte message from Shadin Altitude Encoders,
Altitude Serializers, and Altitude Converters:
Where:
RMS ASCII characters
<sp> space (0x20)
<+/-> sign indicator (0x2b["+"] or 0x2d["-"])
12345 altitude in feet
T ASCII character
<+/-> sign indicator
12 sensor temperature
ul checksum of bytes 1 through 14 in hex ASCII (i.e., "FA")
<CR> carriage return (0x0d)
Note: Checksum is calculated by adding each byte in the message (1 through 14).
GDL 88 TSO Installation Manual
190-01122-00
RMS<sp><+/->12345T<+/->12ul<CR>
Page B-3
Rev. A