> I am needing to talk to a device that speaks RS485. Can a PIC UART > talk RS485 without a protocol converter of some sort? Yes. RS485 is a physical layer specification. It has push pull voltage levels on a balanced line. Actual data can be async serial. Someone will now complain that I have over simplified things AND done violence to the standard. :-) RM -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist