[Pyusb-users] pyusb and pyserial

[Joe A. <joe...@gm...>]

Hello All,

I hope this is the right place for a pyusb user question.  If not, I
apologize (and if you could direct me to an appropriate forum I'd be
obliged).

I am trying to control a thorlabs computer-controlled rotation stage.
The device contains an FT232BM peripheral chip, and can be controlled
with the pyserial package.  However, to figure out which device to
open with pyserial, I check dmesg and see that it's been mounted on
/dev/ttyUSB0.  Then I open pyserial and am about my business.

I'd like to be able to search for all motion controllers connected to
my computer.  I *can* do that with pyusb.  The following code finds
all the devices, and by manufacturer and serial number I can find out
exactly which device is which:


for bus in usb.busses():
   for dev in bus.devices:
      print "Bus %s Device %s: ID %04x:%04x" %
(bus.dirname,dev.filename,dev.idVendor,dev.idProduct)
      h = dev.open()
      print "Manufacturer: %s" % (h.getString(dev.iManufacturer,30))
      print "Product: %s" % (h.getString(dev.iProduct,30))
      print "SerialNumber: %s" % (h.getString(dev.iSerialNumber,30))


My question is:  once I know the usb bus and device numbers, is there
a way to learn that that bus/device combination maps to /dev/ttyUSB0?

Thanks,

Joe