It may or may not matter but How many lines do you have available to do this ? 1 ? 2 ? 4 ? 8 ? Is you have the UART available in each PIC ? Are they running on the same crystal ? Are they on the same voltage ? What is the distance between them and the environment ie is there the possibility of signal corruption ? And so on....... -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body