connecting RS232 to ardinuo

how to send 0 byte continuous data from a particular pin (even if its a transmitting pin )of ardiuno to receiving device through RS232 cable, Here i am trying to give data continuously to device through RS 232 ,please help me

If you really mean RS232 then you should be aware that RS232 voltages can damage an Arduino. You need a MAX232 converter between the RS232 voltage levels and the Arduino’s TTL voltage levels.

You can only send serial data at intervals. What interval do you need between your messages? What baud rate are you using?

Why do you need to send ‘0’ continuously? What is the device you are sending the data to?