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B KLN 94
Rev. 4, Jan/2003 10599I04.CDL Page A-6
FORMAT C (108 BYTE ASCII STRING)
BYTE DESCRIPTION / FORMAT
1-51 Same as Format B described above except that in the Units of Measure field, “I =
Imperial Gallons” is undefined.
52-54 Indicated Airspeed (IAS, knots)
ASCII-coded decimal format (least significant digit is units), LSB first.
Example:
An IAS of 298 knots would be sent as “892” (38H, 39H, 32H).
55 Indicated Airspeed Checksum
Break each decimal value into BCD representation. Using BCD arithmetic, sum the 3
BCD values and convert the lower-order BCD digit to an ASCII coded numeric digit.
56-58 True Airspeed (TAS, knots)
ASCII-coded decimal format as for IAS
59 True Airspeed Checksum
Sum for TAS bytes computed for IAS.
60-62 MACH (airspeed/speed of sound)
ASCII-coded decimal format with an implicit leading decimal point (least significant
digit is thousands).
Example:
A MACH value of .492 would be sent as “294” (32H, 39H, 34H).
63 MACH Checksum
Sum for MACH bytes computed as for IAS.
64-69 Pressure Altitude (PALT, feet)
ASCII-coded decimal format with a sign character.
Example:
A PALT of 34500 feet would be sent as “00543+” (30H, 30H, 35H, 34H, 33H, 2BH).
70 Pressure Altitude Checksum
Sum for PALT bytes, excluding the sign character.
Example:
The sum for -850 feet would be “3” (33H).