Remote Serial Console HOWTO
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8.3. Test the console

Dial in from a machine, perhaps using Minicom .

Example 8-1. Dialing into a serial console


localhost bash$
 
minicom

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
 
remote.example.edu.au-ttyS0


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


Leave Minicom?
 
Yes


Resetting modem

localhost bash$

Interestingly the stty -a command, used to display the terminal settings, reports that the link from the modem to the serial console is 9600 bps . The CONNECT message reports that link between the two modems operates at 33600 bps . 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.


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