From memory :
2 (send data), 3 (receive data) and 7 (ground) are required for asynchronous
terminals/printers.
2 and 3 are straight between a DCE (i.e. mux, DTC, etc) and a DTE (printer,
terminal), crossed-over between 2 DCEs or 2 DTEs.
For synchronous devices (i.e. devices that need/use a clock signal), more
signals are required : 5 (clear to send), 6 (ready to send) and, I believe,
20 (not sure what this one is, perhaps the clock signal itself).
Well, last time I made my own serial cables, Ronald Reagan was still an
actor ... well, not quite, but he was President.
As far as printers are concerned :
- Some printer types (TT18) do NO handshaking at all. No wonder spoolfiles
may be lost !
- Some printers use a hardware handshaking
- Some printers use a software handshaking : X-ON/X-OFF. IIRC, that one goes
thru the data (2 and 3) signals)
All from memory .... After almost a generation, I guess I'll be forgiven a
few memory lapses.
Christian
> -----Message d'origine-----
> De : HP-3000 Systems Discussion [mailto:[log in to unmask]] De la part
> de Francois Desrochers
> Envoyé : lundi 19 mars 2007 18:07
> À : [log in to unmask]
> Objet : Re: [HP3000-L] spool
>
> Art,
>
> Also working off memory...
>
> Minimum: pins 2-3-7 (send, receive, ground)
>
> Some equipment required that pins 2-3 be crossed-over (2<->3, 3<->2)
>
> Some equipment required pin 20 (Data Terminal Ready/DTR).
> Some equipment required pins 5-20 crossed-over.
>
> I'm not responsible for any damage or injury the above may cause... ;-)
>
> Good luck.
>
> François
>
> -----Original Message-----
> From: HP-3000 Systems Discussion [mailto:[log in to unmask]] On Behalf
> Of Art Bahrs
> Sent: Monday, March 19, 2007 12:34 PM
> To: [log in to unmask]
> Subject: Re: [HP3000-L] spool
>
> Hello All :)
> I remember that the cabling for the printers off of a 3k can use 3 or
> 4
> conductors? IIRC, Pins 2, 3, 7, 20 or 22?? Also, matters what type of
> printer is at the end...
>
> Remember it has been at least 10 years since I cabled a 3k and a
> printer to talk to each other :) and we all know about my memory! hehehe
>
> Art "going waaaayyy back for pin outs :) " Bahrs
> =======================================================
> Art Bahrs, CISSP Information Security The Regence Group
> (503) 225-4992 Cell 971-244-2459 FAX (503)
> 220-3806
>
>
>
> "okappert"
> <okappert@CANA
> DA.COM> To
> Sent by: [log in to unmask]
> "HP-3000 cc
> Systems
> Discussion" Subject
> <HP3000-L@RAVE Re: [HP3000-L] spool
> N.UTC.EDU>
>
>
> 03/19/2007
> 09:24 AM
>
>
> Please respond
> to
> "okappert"
> <okappert@CANA
> DA.COM>
> |------------|
> | [ ] Secure |
> | E-mail |
> |------------|
>
>
>
>
>
> David:
>
> I have seen in the past, where a client lowers the priority and then
> turns off the printer for the night. In the morning, raises the
> priority and then turns on the printer. Now if you use the proper
> cabling, the system will know if the printer is ready and there will be
> no loss of output. If the cabling is homemade, then there is the chance
> that not all the signals are are being sent or received from both the
> printer and the computer and you may lose any and/or all output until
> the printer is up to full speed.
>
> In the meantime, make sure the printer is fully warmed-up and
> operational before raising the priority.
>
> Hope this helps.
>
> Olav Kappert
> IOMIT International (HP Application Design and Software Development
> Specialist)
>
>
> David M wrote:
>
> >we have a machine with MPE/iX 5.5. Recently, we started seeing,
> occasionally, when we come in the morning and alter priority for a
> spoolfile to print, it would disappear. when we alter the second one, it
> would print and would continue to work fine till the next day ... has
> anyone seen this phenomena?
> >David Milstein
> >CIS Marketing, Inc.
> >845.268.8600 x 116
> >
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