Bob Ammerman wrote:
>
>RS232 in and out (bit bang ok). TTL levels _not_ OK. MAX232 or similar
>greatly preferred for robustness.
>

Hi Bob,

Certainly you are correct about using TTL levels for RS-232
- ie, 0-5v. But I was wondering about your feelings regarding
bjt RS-232 ports that produce nominal +5v and -12v. Personally,
I think having minus-going is pretty crucial. Not too sure you
gain a lot using +12 over +5v, however, except possibly for
long wires.

Big advantage of the bjt ports is low-quiescent power reqs.
I have played with these quite a bit and have always had very
good luck - using cables to 12 feet and baudrates to 115K.

- danM

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics