In my "first release" of datalogger (was 16F84a based) I don't used a RS232 level converter to send data to the PC and this "generally" worked (tested on my home and Office PC). However, as Jan Erik says, it *might* work but isn' t generally recomended as it is out of RS232 specs. On many PC this method may work if you have a short cable (ex. 1-2 feet max.).

If you want sure to work without problems use the MAX232 or, if you have difficult to find it, build an alternative RS232 level converter as this simple circuit:

http://chaokhun.kmitl.ac.th/~kswichit/ap275/ap275.htm

Note that 16F84a is a bit obsolete now, and a low-cost 16F628a would be much better because it has UART inside. 


regards
Marco



---------- Initial Header -----------

>From      : piclist-bounces@mit.edu
To          : piclist@mit.edu
Cc          : 
Date      : Fri, 15 Oct 2004 13:12:47 +1000 (EST)
Subject : [pic]-Interface pic16f84a with rs232

> Hi...
> Im working on with my project and got stuck.i want my
> output from pic16f84a to be feed to Computer using
> rs232.I have already check the internet about  that
> and stiil confuse.Some of solution says 
> -1-that in order to interface pic16f84a  with rs232 
> MUST have MAX 232
> -2-there is no need of MAX232.
> 
> Problem -How can i interface pic16f84a with com via
> rs232.
> thanks
> 
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