If you build your own cable anyway it's best if pin 20 is tied to the remote
pin 6 as well as 8 rather than pulling 6 high locally.
jepp
> -----Original Message-----
> From: [EMAIL PROTECTED] [SMTP:[EMAIL PROTECTED]]
> Sent: Thursday, April 06, 2000 1:31 AM
> To: [EMAIL PROTECTED]
> Cc: [EMAIL PROTECTED]
> Subject: Re: Can't getty!
>
>
>
> On Wed, 5 Apr 2000, Brendan Miller wrote:
>
> >
> > I have followed known HOWTOs and other examples elsewhere, and cannot
> > for the life of me configure getty, mgetty, or agetty to run a login
> > prompt on /dev/ttyS0 or /dev/ttyS1. I have put the correct stuff in
> > /etc/inittab and /etc/gettydefs, but still nothing.
> >
> > I am trying to hyperterm over a NULL modem cable from a Windows 95
> > machine. I know the Win95 machine serial configuration is good, as
> > well as the null modem cable, as I have used them for other things.
> >
> > Any help for troubleshooting a bogus getty?
> >
> > Brendan
> >
> Each *getty is a little different to configure, but if you have referred
> to the man page for the appropriate *getty and can't get any of the to
> work, I would be willing to bet you a nickel you aren't using a full
> null-modem cable. Never mind that it works for other apps, if you don't
> take special care to configure the *getty, and perhaps also the serial
> port, to allow for missing modem status signals, it is not going to work
> for linux serial comms unless all the status/control lines are correctly
> crossed. For instance, unless you specify CLOCAL in the termios,
> open() on a serial line will block (unless you set O_NONBLOCK) waiting
> for carrier detect to come up. I think. In any case, things work much
> better with a proper null-modem cable. I have used agetty, slattach,
> and pppd (by turns, not all at once) without any trouble over a
> null-modem cable built as described in the null-modem micro-howto that
> follows.
>
> If you want to see it online, visit http://nwonknu.org/micro-howtos
>
> Lawson
>
> *******************************><******************************
> null-modem micro-howto version 0.0.1 <[EMAIL PROTECTED]>
> 20 February 2000 Use, distribute or change at your own risk.
>
> Do yourself a favor. Make up a full null-modem cable. You will be
> amazed how much better things work. Here is a quote from an old
> NET-3-HOWTO on how to wire it (for a 25 pin setup. Translate the pin
> numbers for 9 pin, but this is the way you want to cross the signal
> lines):
>
> 7.1. Serial NULL Modem cable
>
> Not all NULL modem cables are alike. Many null modem cables do little
> more than trick your computer into thinking all the appropriate
> signals are present and swap transmit and receive data. This is ok but
> means that you must use software flow control (XON/XOFF) which is less
> efficient than hardware flow control. The following cable provides the
> best possible signalling between machines and allows you to use
> hardware (RTS/CTS) flow control.
>
> Pin Name Pin Pin
> Tx Data 2 ----------------------------- 3
> Rx Data 3 ----------------------------- 2
> RTS 4 ----------------------------- 5
> CTS 5 ----------------------------- 4
> Ground 7 ----------------------------- 7
> DTR 20 -\--------------------------- 8
> DSR 6 -/
> RLSD/DCD 8 ---------------------------/- 20
> \- 6
>
> And here is my rather cryptic 9 pin to 25 pin map:
>
>
> 5 4 3 2 1 f 1 2 3 4 5 6 7 8 9 10 11 12 13 m
> 9 8 7 6 14 15 16 17 18 19 20 21 22 23 24 25
>
> 1 rlsd=cd 8 2 rd 3 3 xd 2 4 dtr 20 5 gnd 7 6 dsr 6 7 rts 4 8 cts 5
> 9 ring 22 xcl 9 -xcl 11 rcl 18 -rcl 25
>
> You might find the Serial-HOWTO helpful, too.
>
>
>
>
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