i need to transmit a data from PC using RF transmitter and receive it using receiver... we are using AT89c51 controller..... how the data is transmitted and wats the connection between PC and transmitter
Your processor don't care much about your link, as long as the data can be sent and received.
So instead of normal RS232 tranceivers, you have RF transmitter and receiver. The only difference is that you may have an enable signal to turn on carrier, i.e. basically powering up the transmitter.