How do I check and configure serial ports under
Linux for various purposes such as modem, connecting null modems or connect a
dumb terminal?
Linux offers various tools. Linux uses ttySx for a serial port device name. For example, COM1 (DOS/Windows name) is ttyS0, COM2 is ttyS1 and so on.
Linux offers various tools. Linux uses ttySx for a serial port device name. For example, COM1 (DOS/Windows name) is ttyS0, COM2 is ttyS1 and so on.
Task:
Display Detected System's Serial Support
Simple
run dmesg command
$ dmesg | grep tty
Output:
[ 37.531286] serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
[ 37.531841] 00:0b: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
[ 37.532138] 0000:04:00.3: ttyS1 at I/O 0x1020 (irq = 18) is a 16550A
setserial
command
setserial is a program designed to set and/or
report the configuration information associated with a serial port. This
information includes what I/O port and IRQ a particular serial port is using,
and whether or not the break key should be interpreted as the Secure Attention
Key, and so on. Just type the following command:
$ setserial -g /dev/ttyS[0123]
Output:
/dev/ttyS0, UART: 16550A, Port: 0x03f8, IRQ: 4
/dev/ttyS1, UART: 16550A, Port: 0x1020, IRQ: 18
/dev/ttyS2, UART: unknown, Port: 0x03e8, IRQ: 4
/dev/ttyS3, UART: unknown, Port: 0x02e8, IRQ: 3
setserial with -g
option help to find out what physical serial ports your Linux box has.
Linux serial console programs
Once serial
ports identified you can configure Linux box using various utilities:
Ø minicom- The best friendly
serial communication program for controlling modems and connecting to dump
devices
Ø wvidial or other GUI
dial up networking program - a PPP dialer with built-in intelligence.
Ø getty / agetty - agetty opens a tty port, prompts for a login name and
invokes the /bin/login command.
Ø grub / lilo
configuration - To configure serial
port as the system console
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