USB-Based instruments that do not appear to the host as a virtual com port (VCP) usually use libusb for communication. The pyvisa-py driver for pyvisa can communicate with these instruments. However, you must first create a udev rule (and possibly a user group.)

If you see the device in lsusb, but not the pyvisa ResourceManager, you need to add (or modify a udev rule):

```

backup 99-com.rules (if it exists)cp /etc/udev/rules.d/99-com.rules /etc/udev/rules.d/99-com.rules.BAK# (create and) edit the filenano /etc/udev/rules.d/99-com.rules# Add the following lineSUBSYSTEM=="usb", MODE="0666", GROUP="usbusers"# create a usbusers groupsudo groupadd usbusers# add your account to the new groupsudo usermod -a -G usbusers USERNAME# restart udev/etc/init.d/udev restart(Although, you are probably better off rebooting.)

```