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Old Oct 11, 2012, 04:08 PM
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idonasch's Avatar
Germany, Berlin
Joined Jun 2004
73 Posts
Question
Flight Data Recorder (FDR) I2C protocol to 900MHz transmitter

I'm trying to feed the FDR data that used to be transmitted through the 900Mhz link now into the Multiplex telemetry MSBus with the help of an Atmega. So far I was able to simulate the TX module on I2C address 0x11 and read the data that is supposed to be sent to the dashboard.
Does anybody know how to interpret the data? first byte seems to be the data type (0x1 == version info, 0x2 == telemetry data, ...) and for the telemetry data the next bytes are the length of the payload and the 4 servo positions. the rest I have not yet deciphered: e.g.
<23+0-
>22+1+D+9B+28+17+
...
<23+5-
>22+2+1E+0+0+0+0+AD+0+0+0+C5+6E+CA+1+0+0+29+1+0+0+ 0+0+FF+FF+FF+FF+0+0+0+0+0+0+

the data queried from the Tx module is probably a status byte. I have seen 0/2/3/5 coming from the original Tx

is there any documentation on the data format that is available to me?

the next step then would be to feed that data into the M-LINK receiver, the protocol for that part has already been discussed somewhere else.

any hint is appreciated!

thanks
ingo
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Old Oct 16, 2012, 02:48 PM
billpa's Avatar
Joined Nov 2003
4,936 Posts
Hi ingo,

The data are raw sensor values requiring a lot of code to interpret, and are compressed in some cases, so this unfortunately would be a monumental task. Sorry about that!
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