James Newton, Host wrote:
> Most of the time, TTL levels will work just fine....
>
> ...which means that sometimes, TTL levels will NOT work.
>
> http://www.piclist.com/techref/io/serial/RCL1.htm Converts TTL to RS232 when
> needed
>
> (shameless plug)
>
>   
This shameless plug is totally legitimate. I have two of these and they 
work VERY well.

--Bob
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