Multimeter USB output

[Rob Gaddi]

Joe wrote:

> The UT61B has two interfaces, a RS232C interface and this usb interface. 
> The RS232 interface works well with PySerial. It continously transmits 2 
> .. 3 Pakets per second with 14 Bytes each. This happens unsolicited 
> without any command as long as the RS232C/USB button on the DMM is active.
>

>From someone who does a LOT of code to talk to DMMs, scopes, counters,
etc?  Word of advice.  You're done.  Declare victory and move on.

You've got it working on one interface.  The other is even less well
documented and requires doing deep-down stuff against libusb because
there's no actual kernel driver, and you've got a Chinese manufacturer
of a low-end device being of little to no help so now you're trying to
reverse engineer the protocol from bad code without even the help of a
packet sniffer.  This is the sort of rabbit hole that weeks manage to
fall into with nothing to show for them.

If this is an exercise in learning to work with libusb then have at. 
But if what you actually need from this is to talk to the meter?  You're
talking to it already.  Take the win and walk.

-- 
Rob Gaddi, Highland Technology -- www.highlandtechnology.com
Email address domain is currently out of order.  See above to fix.