You havent told us what the protocol requirments are, any scheduling problem is a balance between fairness, latency, throughput and complexity which is why different protocols are still being invented. I'm looking to implement a RS422 multidrop protocol soon too so your ideas were interesting. At 11:05 AM 10/08/99 -0400, you wrote: >I've been thinking over the last week or so that internet connected PIC >projects would be an excellent idea. Instead of having to write a host >application interface everytime you can just use an existing IP stack. Also >you get internet routing for free.... Nicholas Uloth Industrial Software Partners Ltd 6 The Promenade Mt Pleasant, Perth, WA 6153 Australia Phone: xxx-61-0418-902-724 Fax: xxx-618-9481-7202 eMail: niculoth@iohk.com ICQ: 21812719