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Appendix B GDL 88 DATA FORMAT
B.1 GDL 88 RS-232 Fuel/Air Data Input Format
B.1.1 Electrical Interface
The input signals are compatible with RS-232C. Data input at 9600 baud (1200 baud for Apollo Altitude
Encoder) with a word length of 8 bits, one stop bit, and no parity. One message is received per second.
B.1.2 Icarus Altitude Sentence
The GDL 88 is capable of receiving the following 10-byte message from the Icarus Altitude Serializer:
Where:
ALT
ASCII characters
<sp>
space (0x20)
12345
altitude in feet
<CR>
carriage return (0x0d)
B.1.3 Apollo Altitude Sentence
The GDL 88 is capable of receiving the following 17-byte message from an Apollo Altitude Encoder:
Where:
#AL
ASCII characters
<sp>
space (0x20)
sign indicator (0x2B["+"] or 0x2D["-"])
<+/->
ddddd
altitude in feet (-1000 feet to 35,000 feet)
T
ASCII characters
<+/->
sign indicator
dd
sensor temperature
checksum of bytes 1 through 14 in hex ASCII (i.e. "FA")
ul
<CR>
carriage return (0x0D)
Page B-2
Rev. A
ALT <sp>12345<CR>
#AL<sp><+/->ddul<CR>
GDL 88 TSO Installation Manual
190-01122-00