[cups.general] usb printer assignement
Michael Sweet
msweet at apple.com
Wed Aug 11 20:40:18 PDT 2010
Recent CUPS releases (since 1.3.0) use the printer's serial number (if provided) to differentiate between devices. If your printers don't provide a serial number you are basically SOL... :(
On Aug 11, 2010, at 8:22 PM, sandy basickes wrote:
> Our last system was a 3 year old linux software system
> that used lprng and had 5 printers:
> 3 serial
> 1 usb
> 1 parellel.
> We now have a new system
> linix 2.6.33.3 #2 SMP Mon Jun 21 14:47:31 EDT 2010 x86_64 GNU/Linux
> and have moved from using lprng to cups(debian package). We
> now have 6 printers:
> 3 serial
> 3 usb
> We were able to add and print to the serial printers through cups.
> These came up as they should and could be addressed with their cups name.
> We then added the 3 usb printers:
> ML421 Oki Data (fed with double sheet paper) ( default)
> ML421 Oki Data (fed with single sheet paper)
> Toshiba B-SA4T
> In cups, these were named lp, p1 and tecb respectively.
> The first two Oki printers are the same make and model.
>
> When the system is booted with all printers powered, the
> printers are assigned randomly to /dev/usb/lp0,
> /dev/usb/lp1 and /dev/usb/lp2. When we print
> to lp, cups sends the data to whichever printer was randomly
> assigned to /dev/usb/lp0 at startup.
>
> If we boot up with only one printer powered, then the
> powered printer is assigned to /dev/usb/lp0 with cups name lp.
> If the second printer is powered it comes up as /dev/usb/lp1 with
> cups name p1. Likewise, when the third printer is powered it comes up
> as /dev/usb/lp2 with cups name tecb.
>
> When powered simultaniously, how can we have the printers consistently
> assigned to the same port and cups name ?
> Is there another way to define the usb printers so that the same cups name
> is always assigned to the same printer?
>
>
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________________________________________________________________________
Michael Sweet, Senior Printing System Engineer, PWG Chair
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