possible reasons of cryptic characters in Minicom output

[Martin T]

Adam,
indeed. Under "Modem and dialing" configuration I have a following
"Init string":

~^M~AT S7=45 S0=0 L1 V1 X4 &c1 E1 Q0^M

..which is exactly the one printed by Minicom. Thanks for pointing
this out! However, how could this modem init string sent by Minicom
interfere the serial communication? I mean even if I empty the "Init
string", how could this help to establish serial communication with
this radio device I mentioned? Because I don't mind the modem init
sequence printed- the main goal is to establish a communication with
the radio device but I'm out of ideas because the speed and other
parameters seem to be correct, and two-way communication works..


regards,
martin


2011/9/17 Adam Lackorzynski <adam at os.inf.tu-dresden.de>:
>
> 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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