On Tue, 22 Nov 2005, Steve Bangert wrote: > Maybe the page eject signal is a function of cups, here's a usbmon trace > with those same two files sent through cups instead of directly to the > device node: > > ddb97300 1746092587 S Bi:003:02 -115 8192 < > d8c4e100 1746092870 S Ci:003:00 s a1 01 0000 0000 0001 1 < > ddb97300 1746093825 C Bi:003:02 0 0 > d8c4e100 1746093831 C Ci:003:00 0 1 = 18 > ddb97800 1747572137 S Bo:003:01 -115 3410 = 1b401b28 52080000 52454d4f > 54453150 4d020000 00534e03 00000001 1b000000 > ddb97800 1747622575 C Bo:003:01 0 3410 > > ddb97800 1747622645 S Bo:003:01 -115 2852 = 03fffc00 fffc003f fffffcfa > 00013ff0 c200c500 0203ffc0 fb000bff c000ffc0 > ddb97800 1747665567 C Bo:003:01 0 2852 > > ddb97800 1748029374 S Bo:003:01 -115 3455 = fc0003ff c000000f ff003ffc > ff00f0fa 000103ff fa00013f fcfe0004 3ffc000f > ddb97800 1748079498 C Bo:003:01 0 3455 > > ddb97800 1748079632 S Bo:003:01 -115 1519 = c0003ff0 00000300 00ffc081 > 00810081 0081009f 00c30001 3ff0fc00 01ffc0fc > ddb97800 1748103493 C Bo:003:01 0 1519 >
That's the first file. Cups does a lot of processing and formatting -- it may even convert the text into a bitmap image and send that. By looking at the values on the "S Bo:" lines we can see that 3410+2852+3455+1519 = 11236 bytes were sent -- up from 9! > ddb97300 1759874400 S Bi:003:02 -115 8192 < > df0f2e00 1759874447 S Ci:003:00 s a1 01 0000 0000 0001 1 < > ddb97300 1759875598 C Bi:003:02 0 0 > df0f2e00 1759875603 C Ci:003:00 0 1 = 18 > ddb97800 1760357775 S Bo:003:01 -115 2453 = 1b401b28 52080000 52454d4f > 54453150 4d020000 00534e03 00000001 1b000000 > ddb97800 1760394518 C Bo:003:01 0 2453 > > ddb97800 1760394626 S Bo:003:01 -115 3819 = f000003f f000003f ff003ffe > ff03f000 00fffe00 000ffcff 0a00003f ff000003 > ddb97800 1760451505 C Bo:003:01 0 3819 > > ddb97800 1760451591 S Bo:003:01 -115 4347 = fc0003ff c000000f ff003ffc > ff00f0fa 000103ff fa00013f fcfe0004 3ffc000f > ddb97800 1760516490 C Bo:003:01 0 4347 > > ddb97800 1760818127 S Bo:003:01 -115 1987 = c0003ff0 00000300 00ffc081 > 00810081 008100d5 00c30001 3ff0fc00 01ffc0fc > ddb97800 1760847433 C Bo:003:01 0 1987 > And that's the second file, with 2453+3819+4347+1987 = 12606 bytes total. > Would it help if i sent a usbmon trace with a working printer to see the > contrast? That's a good idea. Print the same files the same way, and let's see what goes over the USB connection. Alan Stern ------------------------------------------------------- This SF.Net email is sponsored by the JBoss Inc. Get Certified Today Register for a JBoss Training Course. Free Certification Exam for All Training Attendees Through End of 2005. For more info visit: http://ads.osdn.com/?ad_id=7628&alloc_id=16845&op=click _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
