Serial Port connection between two machines in virtual box

On Host Machine or Machine 1:

1. Create host pine with \\.\pine\com1
2. Tick on create pipe (you have to power on this machine 1^st as you are creating pipe here)

Machine->Setting->Serial Ports (Setting for Machine 1 or Host Machine)

On Test Machine or Machine 2:

1. Create host pipe with same name \\.\pipe\com1
2. We are using host pipe created by host machine so please don’t mark checked for create pipe here.

Machine->Setting->Serial Ports (Setting for Machine 2 or Test Machine)

Now you can power on both machine for testing serial port.

Some Useful commands :

[root@localhost ~]# dmesg | grep tty

console [tty0] enabled

serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A

00:05: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A

Information about serial port setting:

[root@localhost ~]# stty < /dev/ttyS0

speed 9600 baud; line = 0;

-brkint -imaxbel

[Baud rate must be same at both machine]

Test Connection:

On First machine:

[root@localhost ~]# echo hii > /dev/ttyS0

On second machine:

 [root@localhost ~]# cat /dev/ttyS0

hii

[ Note : Please run cat command first ]