RS-422 is perfect, but then you need a special cable.
The Newt to PC cable will not do the job because the RS-422 on the Newt side
is connected such that it adapts to the RS-232 on the PC side.
To make such a cable you definitely need the pin out info from the printer
port or maybe a standard RS-422 pinout for SUB-D 25.
Using the null-modem Newt cable instead of the Newt to PC cable will not
change anything, because the Newt to PC cable is a null-modem cable as well.
If you can find a Mac serial (modem) cable, this would do the job. (not
crossed, mini-DIN connector on one side, SUB-D25 on the other side)
Johannes
> -----Original Message-----
> From: newtontalk-bounce_at_newtontalk.net
> [mailto:newtontalk-bounce_at_newtontalk.net]On Behalf Of Karel Jansens
> Sent: Wednesday, July 03, 2002 12:45 AM
> To: newtontalk_at_newtontalk.net
> Subject: Re: [NTLK] Newton print to serial port of HP LaserJet 4?
>
>
>
> On Tuesday 02 July 2002 16:52, Johannes Wolf wrote:
> > First there is the hardware connection to clarify:
> > What cable did you use?
> > The (Windoze)PC to Newt cable:
> > - has a 9 pin SUB-D connector and the Printer will most probably have a
> > 25 pin SUB-D connector - this needs to be adapted
>
> I did use the standard Newton-to-PC cable, with a 9-to-25 adapter and a
> gender changer (the back of the LaserJet is a mess <G>). No crossovers.
>
> > - since PC AND Newt are considered to be DCE, the transmit and receive
> > lines are crossed - you need to cross them again in order to match Tx
> > and Rx lines of the Newt and the printer
>
> I'll try it with my null-modem Newton cable then. Thx.
>
> > - The Newt does not support handshaking signals for the RS-232 (of the
> > printer)- thus you need to select no hardware handshake on the printer
> > side or connect the handshake signals of the printer properly
> > (null-modem)
>
> Actually, the LJ4 has a menu option to choose RS-422 for serial.
> IIRC that
> is the Apple serial protocol.
> >
> > From the software I would guess that the printpack software will provide
> > the appropriate Laserjet driver ...
>
> Yes, it does. At least, it has a LaserJet driver; nothing LJ4 spcific,
> though...
>
> --
> Karel Jansens.
>
> "Ceteris censeo Fenestras delendas."
> (Cato - de Terrore Portarum)
>
> --
> Read the List FAQ/Etiquette: http://www.newtontalk.net/faq.html
> Read the Newton FAQ: http://www.guns-media.com/mirrors/newton/faq/
> This is the NewtonTalk mailing list - http://www.newtontalk.net
>
-- Read the List FAQ/Etiquette: http://www.newtontalk.net/faq.html Read the Newton FAQ: http://www.guns-media.com/mirrors/newton/faq/ This is the NewtonTalk mailing list - http://www.newtontalk.net
This archive was generated by hypermail 2.1.2 : Thu Aug 01 2002 - 06:01:57 EDT