Thank you Luciano. Those were the days when I had to explain to people that the Commodore 64 was not a band including Lionel Richie

Master, You may want to look at RS485 http://en.wikipedia.org/wiki/RS-485 . I have not done this with a PIC but many have. You are new here so here is a link to the archive http://list.picbasic.com/cgi-bin/board-search.cgi .