Hello, 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 ? Thanks a lot, Best regards, Matt. -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu