serial communication - WEIRD-- waveform
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> RING
<1ST
<2ND
> ____ ______
> RDET |_________| |___ <-- connected with22k pullup
>
> _________ __ <---22k pullup
> CDET _____| |____|
>
> DATA
||||||||||||||----
>
<1ST
<2ND
> ____ ______
> RDET |_________| |___ <-- connected with22k pullup
>
> _________ __ <---22k pullup
> CDET _____| |____|
>
> DATA
||||||||||||||----
>