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USB devices

USB devices

2007-04-25       - By Alan Bartlett

 Back
Reply:     1     2     3  

First, some background info.  My earliest experience with Unix was back in
the early 1980s with System III (a version which had heavy influences from
Version 7 & BSD 4.1).  On January 1st this year I installed Red Hat Linux 9
on my new (new to me) home system as the sole O/S.  (I don't like
"ScotiforM" software.)  At present, this system does not have Internet
access (nor a printer!) and so even using this mailing list is a bit of a
convoluted process.

My system has two USB ports.  I've just recently been given a Hewlett
Packard ScanJet 3300C flat-bed scanner which I've attempted to use.  The
system acknowledges an USB device is connected when the scanner is powered
up. The command:

                         sane-find-scanner

passes once I uncommented the bottom two lines in the file
/etc/sane.d/hp.conf, namely

                         /dev/usb/scanner0
                            option connect-device

Making tests and reading the log files I see that this scanner is identified
by

                         VENDOR 0x3f0
                         DEVICE 0x205

As this device code was not shown in the hp.conf file I was not surprised to
see that

                         scanimage -L

fails with the message

                        usb_control/bulk_msg: timeout
                        scanner.c: write_scanner: NAK received
                        No scanners were identified (etc, etc)

Basically I assume that the sane backend does not have support for this
scanner built in. Am I correct?  Is there anything I can do?

Now the second part of my request.  Can anyone please tell me how I identify
the device names for the two USB ports?  What I want to do is access them in
the form of

                        /dev/usb/???

or similar.  Assume (for this thought process) I have two black-boxes, one
connected to each of the USB ports.  And finally, could someone please tell
me the physical specifications - pin-outs, voltages levels, etc - of an USB
port?

Thanks for reading this far.

Alan.

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