Hi all, >From looking at the archive, I can see that this is a somewhat FAQ. Unfortunately, I'm having trouble assembling all that I've read into a coherent picture applicable to my simple problem.... I'd like be able to send characters (debugging printfs) from the 16LF84 in my circuit to my PC serial port W/O USING A LEVEL CONVERTER CHIP. I only need this to work on my PC for debugging purposes (it's not a production circuit) and at low baud rates and short cable distances. I'm also wondering whether I can get away with running this all at Vdd = 3.0V (thus the LF84) or will I need run at some higher voltage while debugging. I'm pretty clear on the PC side (terminal emulator app or basic program), but I'm not certain of the exact electrical connections on the pic side. I've seen mention of using anywhere from 1k to 1meg in series w/o tx/rx lines and along with some mention of pulldowns on these lines. Also, do I need to do anything special with any of the other rs-232 lines such as RTS/DTS, etc. or can I just let them float? (Assuming the pc software is configured correctly.) So, what's the *exact* wiring/circuit that I should use here ? (BTW, inside the PIC I'm planning on using the CCS compiler's serial IO routines.) Thanks in advance, Dan