[time-nuts] Frequency counter recommendation

[Bob Paddock]

> it exists and it is called CDC class:
> <http://en.wikipedia.org/wiki/USB_communications_device_class>
>
> On Windows (for the the serial adapters) it was completely supported from XP
> (SP2?).

SP3 fixes several obscure issues such as the problem with 'combined'
functions, say a Keyboard and Serial Port as one device:

http://support.microsoft.com/kb/918365

"The Usbser.sys driver may not load when a USB device uses an IAD to
define a function that has multiple interfaces, and this function uses
the Usbser.sys driver file in Windows XP"

There are few people that actually recommended using the stock Windows
CDC devices.
FTDI does their own drivers for a reason.

Most odd ball devices use the Human Interface Device (HID) class.

The polled nature of USB 2.0 and less could be a week link in getting
'now' into a computer from Time Nut Hardware.

USB 3.0 gets away from polling in some cases, and might be of more
interest to Time Nuts.


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