I have worked through your description Chris, and can make sense of it. What I drew out makes sense with your operation description as well. It is now going to take me a little while to get the parts together, PCB done, and assembled as it is one of the slightly lower priorities in an extremely tight project. Many thanks for the description. -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu