> I am designing a board that has to exchange some data between a PIC16F84
> and a serial port on a PC, in both ways.
> This will be done for about 1 minute, every week.
> So, my question is :
> Do I have to use a TTL<->RS232 converter, or can I simply use resistors as
> it is explained sometimes on PIC web pages.
> Could you give me your advices ?

You can get away with a resistor and diodes for a quick hack for data from
PC to PIC, but the voltage has to go from 0 -> 5 to -12 -> +12 the other way
around.  Maxxim makes a whole line of RS-232 converters, including some that
run just off of +5.  I've used these many times with PICs.


*****************************************************************
Olin Lathrop, embedded systems consultant in Devens Massachusetts
(978) 772-3129, olin@cognivis.com, http://www.cognivis.com

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