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Anyway i have decided now to install the empeg too after i have replaced its VFD display.

Was the old one broken?

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In that case i have to read the RDS/TMC stream in real time with the PC from the empegs serial or USB interface.

You may have to write a little bit of empeg software to get it to send the RDS stream out over the serial port. It doesn't do that by default right now.

On the bright side, somebody else has already saved you some work there, by making the RDS stream easily available for such programs.

Cheers