possible reasons of cryptic characters in Minicom output

Adam Lackorzynski adam at os.inf.tu-dresden.de
Sat Sep 17 14:37:13 UTC 2011


On Fri Sep 16, 2011 at 12:31:23 +0300, Martin T wrote:
> I'm using Minicom 2.3:
> 
> [root@ ~]# minicom -v
> minicom version 2.3 (compiled Oct 22 2009)
> Copyright (C) Miquel van Smoorenburg.
> 
> This program is free software; you can redistribute it and/or
> modify it under the terms of the GNU General Public License
> as published by the Free Software Foundation; either version
> 2 of the License, or (at your option) any later version.
> 
> [root@ ~]#
> 
> ..under FreeBSD:
> 
> [root@ ~]# uname -a
> FreeBSD  8.0-RELEASE FreeBSD 8.0-RELEASE #0: Sat Nov 21 15:48:17 UTC
> 2009     root at almeida.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC
> i386
> [root@ ~]#
> 
> 
> The problem is that if I try to connect to one specific radio device
> over it's console port, I see only cryptic characters in Minicom
> output:
> 
> Example 1:
> 
> <<<<<
> Welcome to minicom 2.3
> 
> OPTIONS: I18n
> Compiled on Oct 22 2009, 15:57:59.
> Port /dev/cuaU0
> 
>                Press CTRL-A Z for help on special keys
> 
> AT S7=45 S0=0 L1 V1 X4 &c1 E1 Q0
> 
> >>>>>
> 
> Example 2:
> 
> <<<<<
> Welcome to minicom 2.3
> 
> OPTIONS: I18n
> Compiled on Oct 22 2009, 15:57:59.
> Port /dev/cuaU0
> 
>                Press CTRL-A Z for help on special keys
> 
> ������������������������������������������������AT S7=45 S0=0 L3 V1 X4
> &c1 E1 Q0
> 
> >>>>>
> 
> I have tried with every baud rate under "Serial port setup". According
> to documentation this radio device has 19200 8N1 "no data flow
> control" RS232 setup by default. The pinout is correct because I see
> the DE9<->USB adapter Tx and Rx LEDs blinking if a press any key on my
> keyboard.
> 
> Are there any other reasons/situations other than wrong speed that one
> can see a cryptic characters in Minicom output?

This is not so cryptic at all. Looks like the modem init sequence
minicom is sending to the other side which is echoed here. Check the
"modem and dialing" in the config menu to disable this (set to empty).


Adam
-- 
Adam                 adam at os.inf.tu-dresden.de
  Lackorzynski         http://os.inf.tu-dresden.de/~adam/



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