Re: needed help on MINICOM

[Tod Merley]

reply below:

>  Date: Thu, 02 Feb 2006 17:24:50 +0900
>  From: Gowri Satish Adimulam <gowri(a)bitel.co.kr&gt;
>  Subject: Re: needed help on MINICOM
>  To: For users of Fedora Core releases <fedora-list(a)redhat.com&gt;
>  Message-ID: <1138868690.3297.2.camel(a)localhost.localdomain&gt;
>  Content-Type: text/plain; charset="us-ascii"
>
>
>
>  Hi ,
>  iam attaching minicom related files on my system /etc dir .
>
>  These may give some clue about my setting.
>
>  Thanks in advance
>
>  Gowri
>
>  On Thu, 2006-02-02 at 00:20 -0600, Mike McCarty wrote:
>  > Gowri Satish Adimulam wrote:
>  > > Hi ,
>  > > Iam try to use minicom as simple com-port, it is connected to embedded
>  > > system board via RS 232 cable.
>  >
>  > Try looking in your MINICOM environment variable.
>  > Try
>  >
>  > $ minicom -h
>  >
>  > and see what the compiled in path is. Then look in, for example,
>  > /etc/minicom.users or /var/lib/minicom.users or whatever it's
>  > compiled for.
>  >
>  > Are you using a "null modem" cable? You may need it.
>  >
>  > Mike
>  > --
>  > p="p=%c%s%c;main(){printf(p,34,p,34);}";main(){printf(p,34,p,34);}
>  > This message made from 100% recycled bits.
>  > You have found the bank of Larn.
>  > I can explain it for you, but I can't understand it for you.
>  > I speak only for myself, and I am unanimous in that!
>  >
>  -------------- next part --------------
>  # $Id: minicom.users,v 1.1.1.1 1999/12/18 11:18:51 misiek Exp $
>  # Minicom.users   Access file for the minicom program.
>  #
>  # Format:         Either just one username per line, or
>  #                 a username followed by one or more
>  #                 configuration-names. The name of the
>  #                 default configuration is "dfl". The maximum
>  #                 significant line length is 70 characters.
>  #
>  # Location:       The minicom library directory, probably
>  #                 /etc or /var/lib/minicom or whatever.
>  #
>  # Notes:          If you don't install this file in the
>  #                 specified location, everybody will have
>  #                 access to minicom.
>  #
>  #                 This doesn't matter if minicom isn't installed
>  #                 setuid root since access will then be based
>  #                 on the permissions set on the serial port.
>  #
>
>  #
>  # Who may use minicom?
>  #
>  User   gowri
>
>
>  # Everyone has access to all configurations.
>  ALL
>
>  ## The rest are examples.
>  ## # Erik only has access to the default configuration
>  gowri           dfl
>  ##
>  ## # minicom has access to the default configuration, and configuration
>  'tty5'.
>  minicom         dfl     tty3
>  -------------- next part --------------
>  # Machine-generated file - use "minicom -s" to change parameters.
>  pr port             /dev/ttyS3
>  pu baudrate         115200
>  pu bits             8
>  pu parity           N
>  pu stopbits         1
>  pu minit
>  pu mreset
>  pu mdialpre
>  pu mdialsuf
>  pu mdialpre2
>  pu mdialsuf2
>  pu mdialpre3
>  pu mdialsuf3
>  pu mhangup
>  pu mdialcan
>  pu backspace        BS
>  pu rtscts           No
>  pu xonxoff          Yes
>
>  -------------- next part --------------
>  # Machine-generated file - use "minicom -s" to change parameters.
>  pr port             /dev/ttyS0
>  pu baudrate         57600
>  pu bits             8
>  pu parity           N
>  pu stopbits         1
>  pu scriptdir        /etc/ 

Hi Again Gowri!

In a previous e-mail you mentioned:


>  > > ttyS3, 
>  > > baud rate 57600 8n1 which in acordance with embedded
> system. 


But ttyS3 in your machine generated minicom setup file shows:


pr port             /dev/ttyS3
pu baudrate         115200

And I note that you have a ttyS0 set up for 57600.  Are you plugged into and
talking with the right com port?

I also note that hardware/software flow control in the ttyS3 port is:

pu rtscts           No
pu xonxoff          Yes

The "rtscts" is the hardware flow control (Request To Send - Clear To Send)
and "xonxoff" is the software flow control.  If it were me I would try
actively setting and resetting each of these elements in an active session
with the machine connected.  You can do that from within the minicom
program as previously mentioned.

If you have an old serial modem sitting arround they are good to use to tell
you if you are talking with a given serial port.  You could even use another
computer in terminal mode.

If you are into voltmeters, the active (transmit) lines will rest at between
-5 and -12 volts (it may be + - the RS232 standard has low a minus voltage
and high a plus voltage but I may have that reversed).  The RTS and
DTE lines you should see change when you toggle the hardware flow control.
The transmit line you should see "jump" as you transmit characters.

Good Hunting!

Tod