Garmin GTN 625 Installation Manual - page 195
190-01004-02
GTN 625/635/650 TSO Installation Manual
Rev. F
Page B-7
B.2.6 FADC Format 1/Airdata Format 1 Sentence
The Garmin GTN is capable of receiving the following message strings from the Shadin Fuel/Air Data or
Air Data Computer:
SHADIN “z” FORMAT
ZA012
"ZA" (ASCII characters); "012" represents indicated Air Speed (knots)
ZB345
"ZB" (ASCII characters); "345" represents true Air Speed (knots)
ZC678
"ZC" (ASCII characters); "678" represents Mach Speed (thousandths)
ZD<+/->9012
ZE<+/->3456
ZF<+/->78
"ZF" (ASCII characters); sign; "78" represents outside air temperature (Celsius)
ZG<+/->90
"ZG" (ASCII characters); sign; "90" represents true air temperature (Celsius)
ZH123
"ZH" (ASCII characters); "123" represents wind direction (degrees from north)
ZI456
"ZI" (ASCII characters); "456" represents wind speed (knots)
ZJ<+/->78
"ZJ" (ASCII characters); sign; "78" represents rate of turn (degrees per second)
ZK<+/->901
minute)
ZL234
"ZL" (ASCII characters); "234" represents heading (degrees from north)
ZM5678
"ZM" (ASCII characters); "5678" represents fuel flow, right (tenths gallons/
hour)
ZN90123
"ZN" (ASCII characters); "90123" represents fuel used, right (tenths gallons)
ZO4567
"ZO" (ASCII characters); "4567" represents fuel flow, left (tenths gallons/hour)
ZP89012
"ZP" (ASCII characters); "89012" represents fuel used, left (tenths gallons)
ZQ345
"ZQ" (ASCII characters); "345" represents error log/reason indicator
ZR678
"ZR" (ASCII characters); "678" represents checksum
Where:
start-transmit character (0x02)
carriage-return character (0x0d)
line-feed character (0x0a)
<+/->
sign indicator (0x2b["+"] or 0x2d["-"])
end-transmit character (0x03)
† Not available from Air Data Computer
Note: Checksum is calculated by adding each byte in the message (including all characters from
up to and including the error log/reason indicator), such that carries are discarded to give a one byte result.
The ASCII-coded decimal representation of that byte is given, ranging from 0 (0x30, 0x30, 0x30) to 255
(0x32, 0x35, 0x35).
SHADIN “G” FORMAT
GA012
"GA" (ASCII characters); "012" represents indicated Air Speed (knots)