74HC14 is cheaper than either. Just put 100R on the output side, and 1k on the input(100k pulldown so disconnected is idle state). Good for short range comms since any RS232 receiver will be happy with 5V in (>3v of spec). I have mine running 10 meters ad 115.3kbaud in a noisy lab environment without any problems. Robert Jan-Erik Soderholm wrote: >>Why not use a MAX 233 then you dont need the caps (If i read the sheet >>right back a while ago). > > > But doesn't the non-cap version cost (much) more ? > > And, besides, a MAX232 must be one of the most proven > curcuits out there. I would not look in that direction first... > > I took a quick look at the source code in the original post, > and I realy couldn't understand what he was doing. I could > not find any interrupt routine, and it also looked like > the uart receive interrupt flag was polled (?). But, there > wasn't enough code to make any comment on it. > > Jan-Erik. > > > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist