On Fri, Jun 1, 2018 at 9:48 AM, Sasha Yousefi <sashayous...@berkeley.edu> wrote: > Hello, > Hope you are well. I am having trouble communicating with my device using > read and write. My code is able to recognize the device as well as get > attributes of the device. However, when I write to device using > dev.write(endpoint = 2, message = 'OR'), there is no change in the device. > Here is the output of the device attributes. Is there anything I am missing > with the write methods? The specific commands for the device are indicated > by 2 ASCII letters (in the example above, 'OR'). Please let me know if there > is anything I can do to modify my write command. Thank you so much. > > DEVICE ID 0403:6001 on Bus 020 Address 020 =================
> idVendor : 0x0403 > > idProduct : 0x6001 > > bcdDevice : 0x600 Device 6.0 > > iManufacturer : 0x1 FTDI > > iProduct : 0x2 USB-RS422 Cable > This is a FTDI device and it has its own communication protocol. You will have to understand the device communication protocol in order to use pyusb/libusb to talk to it. On the other hand, people has already developed python package to talk to FTDI device -- pyftdi is based on pyusb and pyserial. You can give it a try (I think it is only for Python 3.x) Ref: https://github.com/eblot/pyftdi -- Xiaofan ------------------------------------------------------------------------------ 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
