Gerhard Jäger wrote: "Are you talking about CanoScan N1240U? I'm pretty sure that the Plustek Backend does not support any N24OU device..."
I am indeed talking about the Canon Canoscan N124OU. My "N24OU" in the header is a typo. Sorry. He also wrote, " Anyhow. Please try sane-find-scanner as root user." sane-find-scanner gives me "found USB scanner (vendor=0x4a9, [Canon], product=0x220e [Canoscan] at libusb:001:002 # Your USB scanner was (probably) detected. It may or may not be supported by #SANE. Try scanimage -L and read the backend's manpage" regardless of whether I'm signed on as root or with my normal user sign in. The difference is that when signed on with my usual sign-on I get additional output about how it is unable to check other USB devices at different locations due to insufficient permissions. Additionally, running sane-find-scanner -v -v as either as root or under my usual log on I still get the message <Couldn't determine the type of USB chip (result from sane-backends 1.0.24)>, although I get a lot of other information about the scanner. When running sane-find-scanner in verbose mode as root I get additional output regarding the devices that it was not able to check under my usual login. Gerhard also wrote "Centos 7 and sane-1.0.24 are pretty old. Any chance to move to a more recent version?" As I mentioned previously, I'm a linux newbie, and my selection of Centos was based on a relative's recommendation. I ran update a couple of days ago, so it should be current. I'm not married to Centos, other than through fear that by trying to change to something else I might be opening a can of worms. What would you suggest? As for sane-1.0.24, I originally was not aware that sane was available from the Centos repository, so I downloaded and installed it as a tarball from the sane website. I also installed libusb via a similar mechanism. I was not even able to get sane-find-scanner to detect the N124OU with that setup. I posted a plea for help on a Centos 7 website, and the moderator suggested I uninstall everything and install the Centos repository version via yum. I did so, and now at least the scanner is detected by sane-find-scanner. However I have no objection to trying a tarball version again if it might solve my problem. Gerhart asks about the contents of /etc/sane.d/dll.conf. A copy of my current file is attached. It originally contained a long list of various manufacturers and models, but in my attempts to get scanimage -L to detect my scanner I commented out everything except "net" and "plustek" in an attempt to force SANE to use the plustek backend. I later uncommented "canon_dr" because I saw something somewhere that this might be relevant to the N124OU, but neither of these modifications were helpful. The command "grep -v ^# /etc/sane.d/dll.conf" gives me the output: net canon_dr plustek Running the command " export SANE_DEBUG_PLUSTEK=20 ; scanimage -L" gives me: "No scanners were identified. If you were expecting something different check that the scanner is plugged in, turned on and detected by the sane-find-scanner tool (if appropriate). Please read the documentation which came with this software (README, FAQ, manpages)." I very much appreciate any and all efforts to help me solve this conundrum.
# enable the next line if you want to allow access through the network: net #abaton #agfafocus #apple #avision #artec #artec_eplus48u #as6e #bh #canon #canon630u canon_dr #canon_pp #cardscan #coolscan #coolscan2 #coolscan3 #dc25 #dc210 #dc240 #dell1600n_net #dmc #epjitsu #epson #epson2 #fujitsu #gphoto2 #genesys #gt68xx #hp #hp3900 #hpsj5s #hp3500 #hp4200 #hp5400 #hp5590 #hpljm1005 #hs2p #ibm #kodak #kodakaio #kvs1025 #kvs20xx #leo #lexmark #ma1509 #magicolor #matsushita #microtek #microtek2 #mustek #mustek_pp #mustek_usb #mustek_usb2 #nec #niash #p5 #pie #pint #pixma plustek #plustek_pp #pnm #qcam #ricoh #rts8891 #s9036 #sceptre #sharp #sm3600 #sm3840 #snapscan #sp15c #st400 #stv680 #tamarack #teco1 #teco2 #teco3 #test #u12 #umax #umax_pp #umax1220u #v4l #xerox_mfp
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