Jan-Erik wrote... >I know how to use a MAX232 (or an equivalent chip) >together with a PIC at 5V. But what about if >you'd like to run your PIC at 3V ? Is there RS232 >chips that also runs at 3V ? Or do I have to put >some 3v <-> 5v buffer in between ? Check out the MAX3232. Dave D. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.