BFI57 / P/N BFI57-(xxx)-(xxx)
Operation and Installation
Document-No.: 08.510.010.71e/ Revision: 3.10
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5.2 Outputs at the Serial Interface
The RS-232 interface outputs pressure derived measurements as well as
the GPS position.
5.2.1 Output Protocol
The communication is in "NMEA / pseudo NMEA”, with device specifier
“PFA”.
The checksum is the 8-bit XOR of all characters in the sentence
including the “,” delimiters, between but not including the “$” and “*”
characters.
All output messages are terminated with <CR><LF>.
All other messages than those listed below have to be ignored.
5.2.2 GPS Messages
The following messages of the internal GPS receiver are echoed at the
serial port to the outside, with the same data rate as generated by the
internal GPS receiver (i.e. 4–5Hz):
$GPRMC
$GPGGA
5.2.3 BFI57-specific Output Messages
The following proprietary messages are generated by the BFI57. They
are inserted between the GPS messages.
Indicated Airspeed
This information will be sent with about 5 Hz rate.
$PFA,IAS,vv.v,u*hh
IAS
fixed string, identifying indicated airspeed message
vv.v
indicated airspeed in the unit specified in the following, with one
digit after the decimal, never negative
u
indicating airspeed unit N=kt, K=km/h
*hh
Checksum
Summary of Contents for BFI57
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