usb latency

Hi Greg & company;

Is there available, for a reasonable price, a usb dongle that would do nothing 
but echo the packet back to the src so that some sort of a handle on the 
latency could be measured/obtained?

Over on the emc list, we have a developer that wants to use emc, which 
requires hardware response to such things as limit switch closures in at 
least sub-millisecond response times else the machine, particularly if moving 
at a high speed, might move far enough to destroy the switch (& maybe more 
than that) before it gets stopped by the driving computer.

This developer is already conversant with building usb stuff from the chipset 
up, so the actual implementation doesn't seem to be a huge problem for him, 
if the answer, in the 400 megabaud speeds of today, is a usable figure.

This question and issue is primarily driven by the gradual disappearance of 
the std db25 parport hardware from the newer machines, the portables in 
particular.

We would like to be able to give a definitive yes or no answer to the question 
of "will it work?"

-- 
Cheers, Gene
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Let sleeping dogs lie.
		-- Charles Dickens

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