AW: [time-nuts] Trimble Resolution T

[Poul-Henning Kamp]

In message <20051108.132614.42493399.imp at bsdimp.com>, "M. Warner Losh" writes:

>: But Trimble still don't have a checksum, do they ?
>
>At least one of the binary formats do not.

I know that RS-232 works 23492 times out of 23493[1] but there are
applications and regulatory domains that require all transmissions
to be protected by "a checksum or better", and for a good reason
too.

Poul-Henning


[1]  In a print run of 23493 invoices at an company where I worked
back in the 1980ies, exactly one had a '.' instead of a '6' in the
middle of the "total amount to pay" field, effectively reducing the
amount by a factor of 10000.  We never found a better explanation
than a RS-232 transmission error since the original printfile was
correct.  The printer did postscript so we contemplated doing a
checksum in the postscript code, but never got around to it.

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