From: Johannes Wolf (mp2100_at_mail-gw.estec.esa.nl)
Date: Tue Feb 04 2003 - 07:27:19 PST
The cable trick you intend to do sounds nice, but be warned that this does
not work if you simply use a gender changer inbetween:
both cables are intended to connect the Newt with a PC or Mac respectively,
that means in both cables the Receive lines are crossed with the Transmit
lines in order to let the PC/Mac RECEIVE what the Newt is going to TRANSMIT
and vice versa.
The pin allocation for so called DTE (i.e. computers) serial interfaces is
such that you need the above mentioned crossing to connect DTE with DTE. The
pin assignment of MODEMS (DCE)is different. In this case you need a cable
which is wired 1:1.
Since your Newt is considered to be an DTE, it requires a crossed connection
to PC/Mac.
NOW COMES the trick: if you connect to crossed DTE-DTE cables together you
get rid of the crossed lines and have a 1:1 connection at the end.
Because of the a.m. reasons this will not work.
What you need to do the trick is a so called 0-modem adaptor, which adds the
required third crossing ...
Instead of using a Mac to Newt interconnect cable I would recommend to use a
standard Mac serial cable, which is normally a MODEM-cable and has no
crossed wires.
But of course you can cut one of the DB9 connectors and put a new one (but
male), connecting the wires such that you have no crossed wires.
You should be able to find the standard RS-232 pin assignment for DB-9 in
the internet.
Regards
Johannes
> From: newtontalk-bounce_at_newtontalk.net
> [mailto:newtontalk-bounce_at_newtontalk.net]On Behalf Of Mike Hamende
> Sent: Tuesday, February 04, 2003 3:31 PM
> Subject: [NTLK] IR Adapters
> I also got the remaining interconnect to PC dongleless cables. I was mis=
> taken=20
> about the interconnect to Mac cables. What I got was normal Newton to PC=
> =20
> serial cables. Round mini DIN on one end, DB9 (PC) on the other. I=20
> purchased the hardware to make a DB9 > Mini Din converter, but I have not=
> =20
> gotten around to figuring the pin outs and soldering it together.
> I also am looking at combining the two cables with a DB9 gender changer, =
> which=20
> would result in the interconnect to Mac serial connection some people hav=
> e=20
> asked about. It would require buying two cables, but should work. The N=
> ewt=20
> to PC cable I got were original Apple products new in their original Appl=
> e=20
> packaging.
> Thanks.
> Mike Hamende
> Austin, TX
-- This is the NewtonTalk list - http://www.newtontalk.net/ for all inquiries List FAQ/Etiquette/Terms: http://www.newtontalk.net/faq.html Official Newton FAQ: http://www.chuma.org/newton/faq/
This archive was generated by hypermail 2.1.5 : Tue Feb 04 2003 - 08:00:00 PST