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Message: [QUOTE="Chris Croughton, post: 2416245"] Which can mean a lot of time wasted getting protocols wrong. I was lucky, when I started doing TCP/IP the communications were already out there so I only had to do some 'sniffing' of them to confirm that the spec. had the bits the other way round, but if it isn't defined properly that sort of thing can cause a lot of wasted time and effort. LSB first (see CCITT V.24) <g>. That one I /do/ remember, I was programming async serial comms for a long time... Chris C [/QUOTE]