Re: [oopic] Re: oSerialL - Really confused

You're seeing a positive voltage while the player is sending stop
bits (zeroes)?

That's not a TTL signal...

At 10:56 PM 4/5/2008, design.wonk wrote:

> I am sending TTL level signals - which is what I assumed were
>required as there is just a single TX and a single RX pin on the
>player. When powered up, the TX pin shows +3V, the RX pin shows +0V.
> Although the DOCs for the player refer to it as an RS232 style port:
>
>Serial Modes
>The following two modes use an rs232 style serial port. The port is
>set up for 9600 baud, 8N1
>format. You may or may not need inverters and drivers depending on
>your system configuration. A Basic Stamp, a PIC an AVR, or almost any
>other micro can communicate
>over this kind of link.
>
>
>--- In oopic@yahoogroups.com, Andrew Porrett <slicerwizard@...> wrote:
> >
> > Does the player expect TTL level signals or true RS232 levels? What
> > are you sending?
> >
> > At 04:43 PM 4/5/2008, design.wonk wrote:
> >
> > >I only have to send. I am trying to control a Daisy MP3 player (open
> > >source kit from Make Magazine) with the ooPIC using the Daisy's Simple
> > >Serial Mode

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