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

--- 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.

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