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Serial Interface Specifications
70 Apollo GX50/60/65 Installation Manual
“Z” DATA FORMAT
The format of the fuel/air data computer input is as follows, which conforms to the Shadin
“Z” format serial message. Definition of the input message data that the GX50/60/65 uses is
included in Table 13.
Baud rate: ..........................................9600
Data bits: ...........................................8
Stop bits: ...........................................1
Parity: ................................................none
Expected input rate: ..........................approx. 1 second
Message length: ................................variable (512 character max.)
The serial input message string is expected in the following format.
<STX><message><message> ... <message><chksum><ETX>
<STX> ...............................................ASCII “start of text” character (STX = 02h)
<message> .........................................starts with an ASCII “Z”, then an ID character,
followed by the message data, a carriage return (CR
= 0Dh), and a line feed (LF = 0Ah) See the
following table.
<checksum>.......................................the message checksum, same format as message
<ETX> ...............................................ASCII “end of text” character (ETX = 03h)
Example Fuel / Airdata Input Data
<STX>SA223 223 knots indicated air speed
SB230 230 knots true air speed
SC101 0.101 mach
SD+3200 32,000 feet pressure altitude
SE+3312 33,120 feet density altitude
SF+05 +5°C outside air temp
SG-03 -3°C true air temp
SH010 wind direction at 10° (relative to true north)
SI015 wind speed at 15 knots
SJ+03 +3° / second right turn
SK-050 -50 feet / second vertical air speed
SL359 359° heading (relative to true north)
SM0123 12.3 gallons / hour - right engine fuel flow
SN0300 30.0 gallons used - right engine
SO0131 13.1 gallons / hour - left engine fuel flow
SP0310 31.0 gallons used - left engine
SQ000 no errors
SR01227 122.7 gallons remaining
S*123 Checksum (example only, not actual)
<ETX> end of message string
Figure 20 Fuel / Airdata Data Input (S Format)