What device handles avionics data to the flight recorder ?

Externet

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Hi.
Sensors that have their output data enabled like compass, altitude, horizon, rpm, voltage..., send it to what unit to sequence/glue/serialize? it into the flight recorder ? What is the name of that unit ? Is there a mandatory or standard protocol for that data format ?
I understand small 'private' airplanes may have standalone instruments for pilot visual reading only, not outputting data and not part of this thread.
 


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