raspberry pi ttl rs232 communication

[akashkmandal]

How can I read and write(print, or output it on a screen) data which is coming through TXD0 and RXD0 pins on Raspberry Pi.

[klricks]

How can I read and write(print, or output it on a screen) data which is coming through TXD0 and RXD0 pins on Raspberry Pi.

Use serial terminal software such as minicom
or
Write a script in python or the language of your choice.

Google for examples