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400 SERIES INSTALLATION MANUAL Page D-3
P/N 190-00140-02 Page Rev L
D.6 SHADIN FUEL/AIRDATA COMPUTER SENTENCE
The GARMIN 400 Series units shall be capable of receiving the following message strings from the Shadin
Fuel/Airdata or Airdata Computer:
<STX>
ZA012<CR><LF> "ZA" (ASCII characters); "012" represents indicated Air Speed (knots)
ZB345<CR><LF> "ZB" (ASCII characters); "345" represents true Air Speed (knots)
ZC678<CR><LF> "ZC" (ASCII characters); "678" represents Mach Speed (thousandths)
ZD<+/->9012<CR><LF> "ZD" (ASCII characters); sign; "9012" represents pressure altitude (tens of feet)
ZE<+/->3456<CR><LF> "ZE" (ASCII characters); sign; "3456" represents density altitude (tens of feet)
ZF<+/->78<CR><LF> "ZF" (ASCII characters); sign; "78" represents outside air temperature (Celsius)
ZG<+/->90<CR><LF> "ZG" (ASCII characters); sign; "90" represents true air temperature (Celsius)
ZH123<CR><LF> "ZH" (ASCII characters); "123" represents wind direction (degrees from north)
ZI456<CR><LF> "ZI" (ASCII characters); "456" represents wind speed (knots)
ZJ<+/->78<CR><LF> "ZJ" (ASCII characters); sign; "78" represents rate of turn (degrees per second)
ZK<+/->901<CR><LF> "ZK" (ASCII characters); sign; "901" represents vertical speed (tens of ft/minute)
ZL234<CR><LF> "ZL" (ASCII characters); "234" represents heading (degrees from north)
ZM5678<CR><LF>* "ZM" (ASCII characters); "5678" represents fuel flow, right (tenths gallons/hour)
ZN90123<CR><LF>* "ZN" (ASCII characters); "90123" represents fuel used, right (tenths gallons)
ZO4567<CR><LF>* "ZO" (ASCII characters); "4567" represents fuel flow, left (tenths gallons/hour)
ZP89012<CR><LF>* "ZP" (ASCII characters); "89012" represents fuel used, left (tenths gallons)
ZQ345<CR><LF> "ZQ" (ASCII characters); "345" represents error log/reason indicator
ZR678<CR><LF> "ZR" (ASCII characters); "678" represents checksum
<ETX>
Where:
<STX> start-transmit character (0x02)
<CR> carriage-return character (0x0d)
<LF> line-feed character (0x0a)
<+/-> sign indicator (0x2b["+"] or 0x2d["-"])
<ETX> end-transmit character (0x03)
*Not available from Airdata Computer
Note: Checksum is calculated by adding each byte in the message (including all characters from <STX>
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).
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