if I leave out the timeout parameter (ICA:probe_timeout=100) the error output becomes:

 [2015-11-22 14:17:14] /dev/bus/usb/005/013: tcgetattr failed: Inappropriate ioctl for device
 [2015-11-22 14:17:14] /dev/bus/usb/005/013: tcflush failed: Inappropriate ioctl for device
 [2015-11-22 14:17:14] /dev/bus/usb/005/013: tcgetattr failed: Inappropriate ioctl for device
 [2015-11-22 14:17:14] /dev/bus/usb/005/013: tcflush failed: Inappropriate ioctl for device
 [2015-11-22 14:17:15] /dev/bus/usb/005/013: tcgetattr failed: Inappropriate ioctl for device
 [2015-11-22 14:17:15] /dev/bus/usb/005/013: tcflush failed: Inappropriate ioctl for device
 [2015-11-22 14:17:16] /dev/bus/usb/005/013: tcgetattr failed: Inappropriate ioctl for device
 [2015-11-22 14:17:16] /dev/bus/usb/005/013: tcflush failed: Inappropriate ioctl for device
 [2015-11-22 14:17:17] /dev/bus/usb/005/013: tcgetattr failed: Inappropriate ioctl for device
 [2015-11-22 14:17:17] /dev/bus/usb/005/013: tcflush failed: Inappropriate ioctl for device
 [2015-11-22 14:17:17] /dev/bus/usb/005/013: tcgetattr failed: Inappropriate ioctl for device

This indicates an error in asynchronous serial communication. i.e. In the usb connection.