Hi,

Dallas uses 8-bit CRC for such packets. It seems to be reliable enough.
The procedure is disclosed in their book Automatic Identification Data
Book.

Regards,
Imre


On Tue, 24 Aug 1999, James Cameron wrote:

> Assuming I'm going to be generating between two to eight words of twelve
> bits each in a data stream over a remote control UHF link, what sort of
> checksum or CRC is appropriate?
>
> I get the impression that calculating a checksum or a CRC on such small
> data streams might be ineffective, because of the probabilities
> involved.
>
> For example; sending 24 bits of data followed by a 12 bit arithmetic
> checksum ... the chances of corruption affecting one of the 24 bits and
> then also one of the 12 bits of checksum to mask the corruption seem to
> be higher.
>
> I'm not exactly sure how to express this ... but is there a concern?
>
> --
> James Cameron                                      (quozl@us.netrek.org)
>
> Linux, Firewalls, OpenVMS, Software Engineering, CGI, HTTP, X, C, FORTH,
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> Remote Area Power, Greek Scholar, Tenor Vocalist, Church Sound, Husband.
>
> "Specialisation is for insects." -- Robert Heinlein.
>
>