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The CFA-910 has a USB MicroAB port on its main board (aka the CFA-10022). This port can be used as a USB device port (with the included cable) or a USB host port (with a specialized USB MicroA adapter).
The default mode of this port is that of a USB device acting as a USB Communications Device Class Abstract Control Model (USB CDC ACM). This simply means that it conforms to a USB standard that is easily represented as a communications device or a serial port in most operating system. It performs in this mode courtesy of the USB Gadget driver that is part of the CFA-910's Linux kernel (and the Linux kernel as a whole). In the current install, getty, the linux Login tty attaches to /dev/ttyGS0 (the first gadget serial tty) and provides the user with a login prompt. You can change these behaviors by modifying /etc/inittab and /etc/default/usb-serial.
Connecting the CFA-910's USB MicroAB port to another computer with the included cable is straightforward. Operating systems such as Linux or Apple's OS X come with the necessary drivers that this connection is represented as a serial port. On Linux this is represented as /dev/ttyACM* (where * is some number). On OS X it is represented as /dev/usbmodem* (where * is some number). Microsoft Windows does not come with a USB CDC driver that works out of the box, see http://www.lvr.com/usbfaq.htm. We have written a Windows driver that will work with the CFA-910 and provide better performance, see attached for an alpha version of the driver that will work with Windows XP and later.
The default mode of this port is that of a USB device acting as a USB Communications Device Class Abstract Control Model (USB CDC ACM). This simply means that it conforms to a USB standard that is easily represented as a communications device or a serial port in most operating system. It performs in this mode courtesy of the USB Gadget driver that is part of the CFA-910's Linux kernel (and the Linux kernel as a whole). In the current install, getty, the linux Login tty attaches to /dev/ttyGS0 (the first gadget serial tty) and provides the user with a login prompt. You can change these behaviors by modifying /etc/inittab and /etc/default/usb-serial.
Connecting the CFA-910's USB MicroAB port to another computer with the included cable is straightforward. Operating systems such as Linux or Apple's OS X come with the necessary drivers that this connection is represented as a serial port. On Linux this is represented as /dev/ttyACM* (where * is some number). On OS X it is represented as /dev/usbmodem* (where * is some number). Microsoft Windows does not come with a USB CDC driver that works out of the box, see http://www.lvr.com/usbfaq.htm. We have written a Windows driver that will work with the CFA-910 and provide better performance, see attached for an alpha version of the driver that will work with Windows XP and later.
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