CDC-ACM device issue

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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
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