Minicom and Modem

Minicom and Modem

[Frank Robers _ SOTL]

Hi All

Sorry for the posting. I have tried for two weeks to find my previous set of 
Minicom notes but. 

Anyway hopefully some nice person will help.

I have this computer connected to another computer by null modem cable. This 
is not the first time for this so I know that the other computer is working 
correctly but on this box I reinstalled the system after a major screw up. 
Apparently that was when I lost my minicom notes.

Anyways I have two serial port possibilities /dev/ttyS0 and /dev/ttyS1.
If memory serves me correctly I used ttyS0 previously but either way I have 
tried both.

The problem is that minicom does not see the serial port and I never establish 
a connection.

Again if I recall correctly I had to issue a command from the terminal to 
initiate so that minicom would see the serial port but I can not recall the 
command.

Damn I wish I had my notes back.

Anyway hopefully some one will know what I am talking about and can help.

Thanks

Frank


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Re: Minicom and Modem

[pa3gcu]

On Saturday 01 February 2003 22:10, Frank Robers _ SOTL wrote:
> Hi All
>
> Sorry for the posting. I have tried for two weeks to find my previous set
> of Minicom notes but.
>
> Anyway hopefully some nice person will help.
>
> I have this computer connected to another computer by null modem cable.
> This is not the first time for this so I know that the other computer is
> working correctly but on this box I reinstalled the system after a major
> screw up. Apparently that was when I lost my minicom notes.
>
> Anyways I have two serial port possibilities /dev/ttyS0 and /dev/ttyS1.
> If memory serves me correctly I used ttyS0 previously but either way I have
> tried both.

IIRC, most distro's link /dev/modem to /dev/ttyS1 as default, or dont set it 
at all.

>
> The problem is that minicom does not see the serial port and I never
> establish a connection.

Either you dont have a link to the correct comport in /dev or its set 
pointing to the wrong device.

If its com1 then do as root;
cd /dev
rm modem
ln -s ttyS0 modem

>
> Again if I recall correctly I had to issue a command from the terminal to
> initiate so that minicom would see the serial port but I can not recall the
> command.

minicom -s ?

Set minicom up properly and make sure its now using /dev/modem, ?

>
> Damn I wish I had my notes back.
>
> Anyway hopefully some one will know what I am talking about and can help.
>
> Thanks
>
> Frank
>

-- 
Regards Richard
pa3gcu@zeelandnet.nl
http://people.zeelandnet.nl/pa3gcu/

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Re: Minicom and Modem

[Frank Robers _ SOTL]

Hi

Thanks for the help. I greatly appreciate your taking the effort to respond.

Unfortunately I do not understand exactly you are saying in relation to this 
issue most like because I did not phrase the question correctly. Also I had 
forgotten that this is a dual boot box ( I try to forget the other half.) so 
all I had to do to check if it is /dev/ttyS0 or /Dev/ttyS1 was check 
Hyperlink. I definitely have com1 which is of course /dev/ttyS0 so I reset 
that in minicom accordingly.

Which I believes brings me up to the issue of minicom not seeing the modem 
which I believe you addressed as:

> Either you don't have a link to the correct comport in /dev or its set
> pointing to the wrong device.
>
> If its com1 then do as root;
> cd /dev
> rm modem
> ln -s ttyS0 modem

All well and good but here is where fear of trying the above and destroying 
what I have combines with ignorance to produce intransigence.

Simply put I do not have a modem connected to the serial port.
My modem is an internal modem which works very well on Kppp.
What I have connected to the serial port is a null modem cable so that I can 
transfer files from one computer to a special process computer with the only 
access being a serial port.

Now for the principal issue.

If I issue the above commands will that screw up Kppp from seeing the builtin 
modem and stop normal Internet connections.

Thanks

Frank
 

On Sunday 02 February 2003 04:38, pa3gcu wrote:
> On Saturday 01 February 2003 22:10, Frank Robers _ SOTL wrote:
> > Hi All
> >
> > Sorry for the posting. I have tried for two weeks to find my previous set
> > of Minicom notes but.
> >
> > Anyway hopefully some nice person will help.
> >
> > I have this computer connected to another computer by null modem cable.
> > This is not the first time for this so I know that the other computer is
> > working correctly but on this box I reinstalled the system after a major
> > screw up. Apparently that was when I lost my minicom notes.
> >
> > Anyways I have two serial port possibilities /dev/ttyS0 and /dev/ttyS1.
> > If memory serves me correctly I used ttyS0 previously but either way I
> > have tried both.
>
> IIRC, most distro's link /dev/modem to /dev/ttyS1 as default, or dont set
> it at all.
>
> > The problem is that minicom does not see the serial port and I never
> > establish a connection.
>
> Either you dont have a link to the correct comport in /dev or its set
> pointing to the wrong device.
>
> If its com1 then do as root;
> cd /dev
> rm modem
> ln -s ttyS0 modem
>
> > Again if I recall correctly I had to issue a command from the terminal to
> > initiate so that minicom would see the serial port but I can not recall
> > the command.
>
> minicom -s ?
>
> Set minicom up properly and make sure its now using /dev/modem, ?
>
> > Damn I wish I had my notes back.
> >
> > Anyway hopefully some one will know what I am talking about and can help.
> >
> > Thanks
> >
> > Frank

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Re: Minicom and Modem

[pa3gcu]

On Sunday 02 February 2003 12:45, Frank Robers _ SOTL wrote:
> Hi
>
> Thanks for the help. I greatly appreciate your taking the effort to
> respond.
>
> Now for the principal issue.
>
> If I issue the above commands will that screw up Kppp from seeing the
> builtin modem and stop normal Internet connections.

Why use minicom at all for simply transfering fies via a serial cable.?

Simply configure the device on both sides with slattach or dip and make sure 
both have routes to each other, its a simple network then not a complicated 
thing with minicom.


-- 
Regards Richard
pa3gcu@zeelandnet.nl
http://people.zeelandnet.nl/pa3gcu/

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Re: Minicom and Modem

[Frank Robers _ SOTL]

On Sunday 02 February 2003 08:37, pa3gcu wrote:
> On Sunday 02 February 2003 12:45, Frank Robers _ SOTL wrote:
> > Hi
> >
> > Thanks for the help. I greatly appreciate your taking the effort to
> > respond.
> >
> > Now for the principal issue.
> >
> > If I issue the above commands will that screw up Kppp from seeing the
> > built in modem and stop normal Internet connections.
>
> Why use Minicom at all for simply transferring flies via a serial cable.?

Because that is the only way to make the transfers unless you know of a better 
Linux replacement of MS's Hyper Terminal than Minicom.

The second computer is NOT a Linux box or a MS box but is a specialized 
process control computer whose only access is by Hyper terminal under MS 
Windows. I am attempting to using Linux in this computer (the command 
computer) with the objective of replace MS's Hyper Terminal with Minicom 
under Linux.

Please I don't want to get into the configuration of a Sweitzer system (the 
system being controlled) on this list. Suffice it to say that it is not Linux 
nor MS.

I only want to configure Minicom under linux in the format in which I 
previously had it before I lost the Minicom installation instructions.

What I would appreciate knowing is if I issue the commands you suggest will 
that change the operation of Kppp such that I can not then connect to the 
Internet.


Thanks
Frank
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Re: Minicom and Modem

[pa3gcu]

On Sunday 02 February 2003 17:52, Frank Robers _ SOTL wrote:

> Please I don't want to get into the configuration of a Sweitzer system (the
> system being controlled) on this list. Suffice it to say that it is not
> Linux nor MS.

Sorry i was under the impresstion that both machines were linux.

>
> I only want to configure Minicom under linux in the format in which I
> previously had it before I lost the Minicom installation instructions.

Simply start as root, minicom and use -s
minicom -s
change the port setting to /dev/ttyS0 (i belive you said com1)
make sure the speed is correct and it should work.

>
> What I would appreciate knowing is if I issue the commands you suggest will
> that change the operation of Kppp such that I can not then connect to the
> Internet.

Yes it possably would, disregard what i said about /dev/modem.

>
>
> Thanks
> Frank

-- 
Regards Richard
pa3gcu@zeelandnet.nl
http://people.zeelandnet.nl/pa3gcu/

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Re: Minicom and Modem

[whitnl73]

On Sun, 2 Feb 2003, pa3gcu wrote:

> On Sunday 02 February 2003 17:52, Frank Robers _ SOTL wrote:
>
> > Please I don't want to get into the configuration of a Sweitzer system (the
> > system being controlled) on this list. Suffice it to say that it is not
> > Linux nor MS.
>
> Sorry i was under the impresstion that both machines were linux.
>
> >
> > I only want to configure Minicom under linux in the format in which I
> > previously had it before I lost the Minicom installation instructions.
>
> Simply start as root, minicom and use -s
> minicom -s
> change the port setting to /dev/ttyS0 (i belive you said com1)
> make sure the speed is correct and it should work.
>
Right.  The two programs at either end of a null modem cable must agree
beforehand exactly what speed the line is to run at, otherwise neither
will see what the other is sending.  If you get parity, data bits,or
stop bits wrong, you should at least see garbage.  Oh, windows tends not
to work the control lines according to RS-232, so you might need to set
minicom to ignore Carrier Detect, by default I think it expects carrier
detect to be on if something is at the other end, otherwise it shows a
status of Offline and waits.  stty(1) or termios(3) setting would be
clocal/CLOCAL, sorry I don't remember the minicom setting and don't have
minicom installed just now.  Hardware flow control might not work right
with a windows program either; null modem cables made for windows tend
not to have those lines even present.  You might need to turn off
hardware flow control in minicom.
> >
> > What I would appreciate knowing is if I issue the commands you suggest will
> > that change the operation of Kppp such that I can not then connect to the
> > Internet.
>
> Yes it possably would, disregard what i said about /dev/modem.
>
> >
> >
> > Thanks
> > Frank
>
>
Lawson
--
---oops---



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