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Example from my modem setup, an old 2400 bps SupraModem using Hayes standard AT commands. Initialize modem using kermit with the commands AT E0 Q1 &D2 &C1 S0=1 &W0 to - turn off local echo from modem when in command mode (E0). - disable all result codes from modem (Q1). - make an on/off transition on the DTR line make the modem disconnect and go into command mode (&D2). - make the computer/modem DCD line track the modem/modem carrier detect signal, i.e. no connection means no carrier detect signal to the computer (&C1). - enable auto-answer after the first ring (S0=1). - store the configuration as the start configuration (&W0). The commands on your modem to achieve the same setup may vary, especially the &D2 and &C1 commands may not be entirely standard. Exit kermit/minicom. Put the command /sbin/agetty -w 2400 ttyS1 in the command field of the appropriate line in /etc/inittab to start agetty on /dev/ttyS1 with a 2400 bps speed between modem and computer. Initializing the modem with agetty ---------------------------------- Use the agetty -I command line option to specify a modem init string, like for the same setup as above, use the following agetty command in your /etc/inittab. /sbin/agetty -w -I 'ATE0Q1&D2&C1S0=1\015' 2400 ttyS1 The final \015 is an octal coding of the carriage return character ending the command string. If you're using simpleinit (part of this package) instead of the SYSV compatible init (you're most likely using the SYSV one!) then you must remove the single quotes from the command line above. Note that the &W0 command was not used here since the modem will be initialized each time agetty starts. With a V.34 (28.8 kbps) modem try starting with a command like: /sbin/agetty -w -I 'ATE0Q1&D2&C1S0=1\015' 115200 ttyS1 Note that agetty supports the higher (>9600 bps) serial speeds directly, there's no need to use setserial to use the higher speeds.