[sane-devel] Re: HP 4570c - any progress?

Wed Sep 14 18:07:51 UTC 2005

Hi,

On Tue, Sep 13, 2005 at 07:36:19PM +0200, Bertrik Sikken wrote:
> The protocol is weird because it seems to implement some kind of
> 'USB-over-USB', i.e. the data payload of the USB control packets
> looks like another USB control packet. The payload size never
> appears to exceed 8 bytes.

Maybe this is one of the scanners which use a GL660 as a USB2.0 chip
and the GL646 (USB 1.1) as the real scan chip? This could explain the
USB-over-USB protocol.

Bye,
  Henning