John Nall wrote: > At 09:50 AM 6/9/2003 +1000, Jake Anderson wrote: > > I would imagine they are linked via some sort of 2 way serial link? > Yup. Tx to Rc and Rc to Tx. I must be missing somthing. If the link is full duplex, each one can transmit to the other simultaneously. What resource do they need to negotiate access to? In other words, why is a master-slave relationship necessary at all? Why not make the system fully symmetrical? -- Dave Tweed -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.