Subject:
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RE: USB vs Serial Tower Response Time
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Thu, 21 Aug 2003 12:26:08 GMT
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Reply-To:
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<rhempel@bmts.^ihatespam^com>
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Viewed:
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3257 times
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> Several recent posts have mentioned significantly slower performance
> of the USB Tower when compared to the serial Tower. After several
> measurements, I've concluded that the USB Tower is "natively" only
> slightly slower (~20 milliseconds per message) than the Serial Tower.
> However, many PC applications appear to add significant extra delay
> (~200 msec) for the USB tower.
<snipped long post>
Dick,
This is a remarkably detailed analysis of the difference between the
USB and serial towers. It also contains many useful hints about the
preamble bytes and other esoteric things about the LEGO protocol.
I have an dea how much time it must have taken you to do the experiments
and then write them up so well.
Thanks for doing the work and posting it here on LUGNET!
Ralph Hempel
--------------------------------------------------------------------
Check out pbFORTH for LEGO Mindstorms at:
<http://www.hempeldesigngroup.com/lego/pbForth>
Buy "Extreme Mindstorms: an Advanced Guide to Lego Mindstorms"
<http://www.amazon.com/exec/obidos/ASIN/1893115844/hempeldesigngrou>
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Reply to: rhempel at bmts dot com
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Message is in Reply To:
 | | USB vs Serial Tower Response Time
|
| Several recent posts have mentioned significantly slower performance of the USB Tower when compared to the serial Tower. After several measurements, I've concluded that the USB Tower is "natively" only slightly slower (~20 milliseconds per message) (...) (21 years ago, 21-Aug-03, to lugnet.robotics.rcx)
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