[TriLUG] OT: IBM NetVista serial ports

Andrew Perrin clists at perrin.socsci.unc.edu
Mon Jun 17 13:23:49 EDT 2002


On 17 Jun 2002, Ed Hill wrote:

> Hi Andrew,
> 
>   1) Is the serial port turned on in the BIOS?  Many machines ship 
>      by default with serial ports disabled.

Yes, just checked that.

> 
>   2) As the root user, what does "/bin/setserial -g /dev/ttyS[0-8]" 
>      output?  This will tell us if (and on what device) the serial 
>      port(s) are assigned on Linux.
> 

perrin:~# setserial -g /dev/ttyS[0-8]
/dev/ttyS0, UART: 16550A, Port: 0x03f8, IRQ: 0
/dev/ttyS1, UART: 16550A, Port: 0x02f8, IRQ: 3
/dev/ttyS2, UART: unknown, Port: 0x03e8, IRQ: 4
/dev/ttyS3, UART: unknown, Port: 0x02e8, IRQ: 3


>   3) What does "ls -al /dev/ttyS[0-8]" say?  This will tell us if 
>      you have permissions set so that any user can access the port.

perrin:~# ls -al /dev/ttyS[0-8]
crw-rw--w-    1 root     dialout    4,  64 Apr 14  2001 /dev/ttyS0
crw-rw--w-    1 root     dialout    4,  65 Jun 13 13:04 /dev/ttyS1
crw-rw----    1 root     dialout    4,  66 Apr 14  2001 /dev/ttyS2
crw-rw----    1 root     dialout    4,  67 Apr 14  2001 /dev/ttyS3


BUT... this all fails to work as root, too, and the DOS experience I
related makes me think it might be some bizarre hardware thing.

Thanks,
Andy

----------------------------------------------------------------------
Andrew J Perrin - http://www.unc.edu/~aperrin
Assistant Professor of Sociology, U of North Carolina, Chapel Hill
clists at perrin.socsci.unc.edu * andrew_perrin (at) unc.edu







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