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Old 03-15-2004, 08:48 PM   #1
LQ Newbie
Registered: Mar 2003
Posts: 12

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serial port testing

hi all
Currently we are using SUSE linux 8.1.

I have added my external Hardware through RS232 SERIAL PORT.
but if i type command like ps
ps -vax | grep ttyS0
some times i am getting this message, but some times i am not getting message like this in the console

1 1287 pts/2 R 0.00 136 96 1523 572 0.0 grep ttyS0
why i am not getting this message always. Is that means my serial port is configured properly

From linux planet i came to know like
" Another cause reported for the SuSE distribution is that there may be two serial drivers present instead
of one"

How can I know wheather two or one serial driver present.

One more thing they are suggesting like mouse can access the same port ie. what accessed by serial port.
How can i test these things.

Do u have any idea how to trouble shoot my serial port wheather it is properly configured or not

Expecting your kind reply

Old 04-01-2004, 08:33 AM   #2
Registered: Oct 2003
Location: Switzerland (Europe)
Distribution: OpenSuSE, RedHat, Knoppix, IRIX + MacOSX
Posts: 198

Rep: Reputation: 31
Take a look into /etc/inittab, is there anything active with ttyS ?

The serial port must not be allways on, usually just when you send or receive data.

Is there anythin listening to the port, like a terminal, driver or so ?
Does your PC even know that there is something outside ?
Are the parameters correct: Same speed, parity, hardware-flow-control and so on ?

At last what have you added at the seriel port ?

Old 04-01-2004, 07:54 PM   #3
LQ Newbie
Registered: Mar 2003
Posts: 12

Original Poster
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hi flippi

thanks for your info I faced the problem because of speed mismatch between my machine and product manufacturing machine.
thanks for your needy help


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