Garmin 010-00860-00 Installation Manual - Page 38

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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)

ASCII characters

<+/->

sign indicator

sensor temperature

checksum of bytes 1 through 14 in hex ASCII (i.e. "FA")

<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