8.3. Test the console
Dial in from a machine, perhaps using
   Minicom.
Example 8-1. Dialing into a serial console
| Initializing modem
Welcome to minicom 1.83.1
Press ALT-Z for help on special keys
AT S7=45 S0=0 L1 V1 X4 &C1 E1 Q0                     
OK
Alt-D 
Dialing: remote.example.edu.au-ttyS0 At: 1234-5678
Connected. Press any key to continue
Any
CONNECT 115200/V34/LAPM/V42BIS/33600:TX/33600:RX | 
| Enter
/etc/issue says "All your base are belong to us".
remote.example.edu.au ttyS0 login: user
Password: ********
Message of the day is "be careful out there".
remote bash$ stty -a
speed 9600 baud; rows 0; columns 0; line = 0;
intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = <undef>;
eol2 = <undef>; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R; werase = ^W;
lnext = ^V; flush = ^O; min = 1; time = 0;
-parenb -parodd cs8 hupcl -cstopb cread -clocal crtscts
-ignbrk brkint ignpar -parmrk -inpck -istrip -inlcr -igncr icrnl -ixon -ixoff
-iuclc -ixany -imaxbel
opost -olcuc -ocrnl onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab3 bs0 vt0 ff0
isig icanon -iexten echo echoe echok -echonl -noflsh -xcase -tostop -echoprt
-echoctl -echoke
…
remote bash$ logout | 
| NO CARRIER
Alt-X
 
Resetting modem | 
Interestingly the stty -a command, used to
   display the terminal settings, reports that the link from the modem
   to the serial console is 9600bps.  The
   CONNECT message reports that link between the
   two modems operates at 33600bps.  The constant
   speed modem-computer link is a very useful feature of the Hayes
   AT-style modems: the calling computer need not
   know in advance the line speed of the called serial console.