>        MOVLW   Rx_Buffer
>        ADDWF   Rx_Num, W
>        MOVWF   FSR
>
> > ADDWF adds W to the File not the file to W.
> > After this line W still equals Rx_Buffer.

FSR does = Rx_Buffer + Rx_Num

Maybe you're thinking of SUBLW (=SUBWL) ?

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