Cannot screen Serial Port

[mattyclarkson]

Hello,

I have a new HP Compaq 8200 elite. I have a dual boot system. Windows 7 and Fedora 15.

In Fedora I cannot seem to connect to the serial port. Could anyone help me with resolving this. I've never had issues with hardware before in Linux so this is a little new to me.

[matt@matt ~]$ dmesg | grep tty
[    0.000000] console [tty0] enabled
[    1.445161] serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
[    1.471193] 00:05: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
[    1.491613] 0000:00:16.3: ttyS1 at I/O 0xf0a0 (irq = 17) is a 16550A
[matt@matt ~]$ screen /dev/ttyS0 115200
[screen is terminating]

In windows to get the Serial port to be recognised I had to install Intel Active Management Technology. Do you think I must install the same in Linux?

Thanks,

Matt

[PabloTwo]

Hello Matt,

In Linux, you can use the setserial command, as root, to view/change the serial port parameters. In your case, this would appear to be /dev/ttyS0 and /dev/ttyS1.

In a terminal, use man setserial to read the manual for setserial.

Of course, you don't actually connect to the serial port itself, you communicate with whatever device is attached to the serial port. If you look at the ownership of /dev/ttyS0, you will see that it is owned by root and the associated group is dialout.

BASH:~/-> ls -l /dev/ttyS*
crw-rw----. 1 root dialout 4, 64 2011-06-07 09:16 /dev/ttyS0
crw-rw----. 1 root dialout 4, 65 2011-06-07 09:16 /dev/ttyS1
crw-rw----. 1 root dialout 4, 66 2011-06-07 09:16 /dev/ttyS2
crw-rw----. 1 root dialout 4, 67 2011-06-07 09:16 /dev/ttyS3

You can always use the serial port(s) as root, but if you should want to use it/them as a regular user, the easiest way is to add your regular user to the "dialout" group.
Also, maybe a brief explanation of what you're trying to use the serial port for would help us help you.

[lambcutlet]

goto

system > administration > users and groups

double click your username to bring up User Properties.
select the Groups tab

then check the box beside 'Dialout'

this will give you access to the serial port.

if this does not work also check 'Lock'
i use the serial port and i have both of these checked can't remember why, but my serial port works

[mattyclarkson]

Thank you, that was very helpful for me. I can now screen to the serial port.

I still don't receive anything through it but I think that is a deeper issue as I can't seem to get anything through on Windows 7 Putty either.