[oopic] Re: oSerialH on ooPIC-R, TTL-Level or true RS232?

--- In oopic@yahoogroups.com, "dan michaels" <oric_dan@...> wrote:
>
> --- In oopic@yahoogroups.com, "design.wonk" <design.wonk@> wrote:
> >
> > I was looking at the oSerialH object (after trouble with the
> oSerialL)
> > and it appears that the oSerialH on the ooPIC-R is "hard wired" to
> > line 22 for output and line 23 for input. These are connected to
> pins
> > 2 and 3 respectively of the db9 connector. If I am reading the
> > schematics correctly, are pins 2 and 3 of the db9 providing +5V
> > TTL-Level signals and not true +12v RS232c signals (in that case I
> > should be able to connect them to another device with similar +5V
> > TTL-Level input and output pins).
> >
> > thanks
> >
> > -GeorgeOrr
> >
>
>
> Yes. The oSerialH and oSerialPort [buffered form] objects use the
> main UART on the oopic [PIC] chip for RS232 comms, via the DB09
> connector. However, for some reason, the oopic-r board uses a 0-5v
> logic level inverter, rather than a MAX232 style inverter chip with
> +/-12v levels. According to DennisLC, this interface works
> with "most" PCs [but not all; eg, it works with my old notebook PC,
> but not my desktop PC].
>
> You should be able to connect the oopic-r board to other logic-level
> serial ports, but you will still need an inverter on the remote end.
>

If the remote end is also 0-5V, then I would not need the inverter -
is that correct?

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