[comp.sys.hp] 2225A

tgl@zog.cs.cmu.edu (Tom Lane) (08/21/89)

This is an RTFM type question, but unfortunately I don't have access
to the manual.  Perhaps someone who does would look it up for me?

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)?

Thanks.

-- 
				tom lane
Internet: tgl@zog.cs.cmu.edu
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onymouse@netcom.UUCP (John DeBert) (08/21/89)

in article <5916@pt.cs.cmu.edu>, tgl@zog.cs.cmu.edu (Tom Lane) says:
> 
> This is an RTFM type question, but unfortunately I don't have access
> to the manual.  Perhaps someone who does would look it up for me?

Of course...

> 
> 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)?

According to the manual, SRQ is not programmable. It can be set only by 
the SRQ enable switch on the back.

JJD
onymouse@netcom.UUCP

rjn@hpfcdc.HP.COM (Bob Niland) (08/22/89)

re: "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)?

Regardless of what the manual says, I have seen defect reports that indicate
that the SRQ behaviour of the 2225A is not reliable.  The problem seems to
be unique to the 2225A.  Reported defects include:
  - Only the first SRQ after power-up is detected.
  - Spurious SRQs are detected, and when SPOLL'd, the 2225A denies having
    any reason for the SRQ.

Regards,                                              Hewlett-Packard
Bob Niland        rjn%hpfcrjn@hplabs.HP.COM           3404 East Harmony Road
                  [hplabs|hpu...!hpfcse]!rjn          Ft Collins CO 80525-9599

grg@otter.hpl.hp.com (Gerd Groos) (08/22/89)

>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.