I am trying to interface with the "HEX" devices sold by http://technobit.eu/ which appear as CDC-ACM devices, but give an I/O error whenever I try to open them, with some rather unclear error description in dmesg: [10526714.860052] usb 5-2: new full-speed USB device number 4 using uhci_hcd [10526715.055017] usb 5-2: New USB device found, idVendor=04d8, idProduct=000a [10526715.055026] usb 5-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [10526715.055032] usb 5-2: Product: CDC RS-232 Emulation Demo [10526715.055037] usb 5-2: Manufacturer: Microchip Technology Inc. [10526715.058200] cdc_acm 5-2:1.0: This device cannot do calls on its own. It is not a modem. [10526715.061222] cdc_acm 5-2:1.0: ttyACM0: USB ACM device [10526756.939797] tty_port_close_start: tty->count = 1 port count = 0. The manufacturer reports that it works fine on Windows. Any ideas how I can get this to work on Linux, or at least get more meaningful error information so it can be debugged further? Luke -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
