Multi-Tech MT9234ZBA User Manual page 41

Device Files
Because the TI USB driver does not use usbserial (to avoid known problems with usbserial) it uses its own device file
names, /dev/ttyTIUSB0, /dev/ttyTIUSB1, and so on.
The device files are created automatically when the ti_usb driver is loaded. This is done by the module post-install
command in /etc/modules.conf, which runs the script /etc/ti_usb/make_devices.
You can change the device names that ti_usb uses. First you should remove the old device files by running
/etc/ti_usb/make_devices remove
Then edit /etc/ti_usb/make_devices. At the top of this file you will find the parameters DEVICE_NAME which determines
the basename of the TI USB device files, DEVICE_COUNT which determines the number of device files created,
DEVICE_GROUP which determines the group owner of the device files, and DEVICE_PERMISSIONS which determines
the device file permissions.
For example, to create 8 TI USB device files named /dev/ttyusb0 through /dev/ttyusb7, owned by the uucp group, and
having permissions 0660, change the parameters like this
DEVICE_NAME=/dev/ttyusb
DEVICE_COUNT=8
DEVICE_GROUP=uucp
DEVICE_PERMISSIONS=0660
After editing make_devices, run the script to create the new device files, like this
/etc/ti_usb/make_devices
If you use devfs, the ti_usb devices will be /dev/usb/ti/0, /dev/usb/ti/1, and so on in the order they are plugged in. The
ti_usb driver has not been tested with devfs.
Multi-Tech Systems, Inc. MT9234ZBA-USB User Guide (S000419B)
Appendix E – Linux Installations
41