Am 29.08.2016 um 19:19 schrieb 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. >
Hi, Rob, you mentioned 'packet sniffer'. This was important. I started to try WireShark Portable with USBPCap and continue reading documents like 'USB in a NutShell'. Eventually succeeded in reading and decoding the data from this DMM with the USB interface. This is done with a Delphi XE2 program, using a dll from https://libstock.mikroe.com/projects/view/528/usb-hid-dll-for-delphi-and-perhaps-other-languages. Still unresolved: It seems, this Delphi program does not correctly initialize the DMM. I have to start and stop the utility from the manufacturer of the DMM first, then I can use my Delphi program again and again unless rebooting or pulling off/connecting the DMM. If this is resolved I'll try to return to work on a python solution. Got interesting example code from Niclas Pinault. Still not working - must look why. Regards - Joe ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ pyusb-users mailing list pyusb-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/pyusb-users
