[cups.development] Request more explanation about printer query

[Michael Sweet]

This isn't CUPS doing the query.

On hot plug, an Apple system process (makequeues or makequeues_agent depending on the version) runs to add the printer if it hasn't been already.  If a compatible driver is found, the driver's auto-setup utility (defined in the PPD file) is run to query the printer and set any installable options, etc.  In the case of a PostScript printer, that query might be in the form of a PostScript query job using PJL if the PPD says to use it.

PS: Mac-specific questions are best posted to the Apple "printing" list.

On Sep 1, 2011, at 11:48 PM, hao.chen at primax.com.cn wrote:

> Dear Sir,
> 
> While one USB printer is connected to Mac OS 10.6 or Mac OS 10.7, CUPS will send out PJL query command to printer. Would you please explain the purpose? Where to get the definition or specification?
> 
> Thank & Best Regards!
> Hao 
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__________________________________________________
Michael Sweet, Senior Printing System Engineer, PWG Chair

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