Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!indri!polyslo!usc!ucsd!ucbvax!hplabs!otter!grg
From: grg@otter.hpl.hp.com (Gerd Groos)
Newsgroups: comp.sys.hp
Subject: Re: 2225A (Thinkjet) printer question
Message-ID: <2980008@otter.hpl.hp.com>
Date: 21 Aug 89 21:42:26 GMT
References: <5916@pt.cs.cmu.edu>
Organization: Hewlett-Packard Laboratories, Bristol, UK.
Lines: 39


>The question concerns an HP 2225A (HPIB Thinkjet) printer.
>Under what conditions can this printer send "SRQ" (service request)?
>Is SRQ response programmable, besides the SRQ configuration switch
>(which I assume is just an overall enable/disable)?

Manual page D-4:

   "When the SRQ enable switch is on (set to 1) the printer will assert SRQ 
   when [...]

   - Self test failed
   - Out of paper
   - Carriage Motion Disabled

   [...] If 'listen always' is enabled, the printer will never assert SRQ.
   [...] When the SRQ enable switch is off (0) the printer is prevented from
   requesting service."

   Definition of each bit in the status byte (sent by the Thinkjet on serial
   poll);

   -Bit 7   Self Test failed
   -    6   always 0
   -    5   Out of Paper
   -    4   always 0
   -    3   Buffer full
   -    2   Buffer empty
   -    1   always 0
   -    0   Carriage Motion disabled

   A one in a particular bit signifies that the corresponding condition is
   TRUE.

   The DIP switch on the back of the printer is read only on power-on.

Hope this helps,

                        Gerd.