Subject:
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Re: Building and decoding messages
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 22 Feb 2000 01:34:35 GMT
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Viewed:
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980 times
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In lugnet.robotics, Dave Baum writes:
> In article <FqAz8J.7C@lugnet.com>, "Dennis Clark" <dlc@verinet.com>
> wrote:
> > Hiya, • [snip]
> about the packet level checksum. A packet (for a message) looks like
> > this: 55 FF 00 F7 08 <data> <~data> CS ~CS
> >
> > Using the message $12...
> >
> > If I add the bytes (mod FF) I get FF + F7 + 12, I get 08, but 09 is the
> > correct checksum. Does this mean that the CS is Sum(bytes)+1?
>
> The header of '55 ff 00' isn't counted in the checksum - just F7 + 12 =
> 09
Thanks Dave, I knew I was _missing_ something...
DLC
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