Garmin GNC 420AW Installation Manual - page 145
GNS 400W Series Installation Manual
Page E-5
190-00356-08
Rev. G
SHADIN “S” FORMAT
SA012
"SA" (ASCII characters); "012" represents indicated Air Speed (knots)
SB345
"SB" (ASCII characters); "345" represents true Air Speed (knots)
SC678
"SC" (ASCII characters); "678" represents Mach Speed (thousandths)
SD9012
"SD" (ASCII characters); sign; "9012" represents pressure altitude (tens of feet)
SE3456
"SE" (ASCII characters); sign; "3456" represents density altitude (tens of feet)
SF78
"SF" (ASCII characters); sign; "78" represents outside air temperature (Celsius)
SG90
"SG" (ASCII characters); sign; "90" represents true air temperature (Celsius)
SH123
"SH" (ASCII characters); "123" represents wind direction (degrees from north)
SI456
"SI" (ASCII characters); "456" represents wind speed (knots)
SJ78
"SJ" (ASCII characters); sign; "78" represents rate of turn (degrees per second)
SK901
"SK" (ASCII characters); sign; "901" represents vertical speed (tens of ft/minute)
SL234
"SL" (ASCII characters); "234" represents heading (degrees from north)
SM5678
"SM" (ASCII characters); "5678" represents fuel flow, right (tenths gallons/hour)
SN90123
"SN" (ASCII characters); "90123" represents fuel used, right (tenths gallons)
SO4567
"SO" (ASCII characters); "4567" represents fuel flow, left (tenths gallons/hour)
SP89012
"SP" (ASCII characters); "89012" represents fuel used, left (tenths gallons)
SQ345
"SQ" (ASCII characters); "345" represents error log/reason indicator
SR67890
"SR" (ASCII characters); "67890" represents fuel remaining (tenths gallons)
SS123
"SS" (ASCII character); "123" represents ground speed (knots)
ST456
"ST" (ASCII character); "456" represents track (degrees)
SU789012
"SU" (ASCII character); "789012" represents distance to waypoint (hundredths nautical miles)
SV
"SV" (ASCII character); ―E‖ represents East, ―W‖ represents West; "345" represents magnetic
variation (tenths degrees)
SW
latitude (degrees, minutes, hundredths of minutes)
SX
current longitude (degrees, minutes, hundredths of minutes)
SY
"SY" (ASCII character); ―L‖ represents Left, ―R‖ represents Right; "90" represents drift angle
(degrees)
Sa1234
"Sa" (ASCII character); sign; "1234" represents barometric corrected altitude (tens of feet)
Sb56.78
"Sb" (ASCII character); "56.78" represents current barometric pressure setting (inches Hg)
S*901
―S*‖ (ASCII character); "901" represents checksum
Where:
sign indicator (0x2b["+"] or 0x2d["-"])
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).