Hi Notice that for my TTL level of the RS232 is a logic one. Hence was wondering if there is a need to output a logic '1' onto the transmit pin before the start of any detection of start bit from the PC? __________________________________________________ Do You Yahoo!? Yahoo! Games - play chess, backgammon, pool and more http://games.yahoo.com/ -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics