On Tue, 2013-11-05 at 21:16 +0000, Luke-Jr wrote:
> 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?
What does strace say? The kernel message is a warning, not a hard error.
Regards
Oliver
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