quick'n dirty howto:
connect to a serial-console device e.g. router/switch using the programm minicom, linux[edit]
1) have a look in the output of dmesg | grep tty
[ ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A [ serial8250: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A [ ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A [ ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A
2) start the program "minicom"
3) enter the menu ctrl-A-o
4) change the settings of the serical port
example:
| A - Serieller Anschluss : /dev/ttyS0 |
| B - Pfad zur Lockdatei : /var/lock |
| C - Programm zur Rufannahme : |
| D - Programm zum Wählen : |
| E - Bps/Par/Bits : 9600 8N1 |
| F - Hardware Flow Control : Ja |
| G - Software Flow Control : Nein
5) press ESC and enter settings for Modem and Dialup
6) change Modem Initialisation to : ~^M~
(simply remove the: A - Modem-Initialisierung ~^M~AT S7=45 S0=0 L1 V1 X4 &c1 E1 Q0^M )
7) press ESC and save your settings as "dfl"
8) press CTRL-A-x to exit mincom, and start it again, it sould show status "online"