HP LaserJet 500 color MFP M575 using eSCL: Scanner operates, histogram data shown in xsane, but error: "Failed to start scanner: Document feeder out of documents"

[rubin55]

I added my MFP device, an HP LaserJet 500 color MFP M575 which is connected through ethernet and has a fixed IP address, to /etc/sane.d/escl.conf:

# escl.conf -- ESCL configuration
device https://172.17.1.26:443 "HP LaserJet 500 color MFP M575"

I then start xsane, select the scanner from the list and click the scan button. I can hear + see the scanner motor operating. Looking at the device status page, I see a message "Scanning page from glass". I see xsane loading the color histogram data, but I then get an error message dialog telling me the following:

Failed to start scanner: Document feeder out of documents

It does not matter if I select flatbed or ADC or ADC Duplex as source. It also does not matter if I do scan to file directly, use preview or send to viewer, I always get the same error message.

Please find attached the trace log: xsane-zeroconf.log

[alexpevzner]

Hi @rubin55,

there are actually 2 eSCL drivers for SANE: sane-airscan and sane-escl.

If you've added your device using escl.conf, you use sane-escl.

I suggest you to try my driver. Usually it works better. You will need to add your device to the /etc/sane.d/airscan.conf using the following syntax:

[devices]
"HP LaserJet 500 color MFP M575" = https://172.17.1.26:443/eSCL

Or you can use the airscan-discover program (typically it comes with the sane-airscan package), it will discover all devices around and create airscan.conf file for you.

Please notice, you may use arbitrary device name (quoted, left to the equal sign); this is the name that you will see in device selection menu of the scanning program

[rubin55]

It works! Thanks so much, I can't tell you how long I was struggling with this, such an improvement to my workflow. I did notice that in xsane, I can only select greyscale or color, not black and white; is that a limitation of the protocol of sorts? In any case, I'm super happy, thanks a bunch.

[rubin55]

By the way, is it expected that xsane only shows a Color and Gray scan mode? I would expect B/W also, but for some reason, it doesn't show it.

[alexpevzner]

sane-airscan doesn't support B&W. To support B&W I will have to add PDF decoder. It adds a bit too much dependencies, plus PDF hard to decode line-by-line, without need to allocate a large whole-image buffer.

So taking in account low value of B&W scan (it easily can be converted from the color or grayscale image without need to implement it in the driver) currently I think it doesn't worse to be implemented.

However there are always some chance that I may change my mind in the future :)