Re: Dtaa transmitting
These RF modules take data in serial format (same as RS-232) then use ASK modulation - see picture below - transmit modulated signal through RF channel and finally the receiver demodulates signal and outputs data again in serial format ..
From RF modules point of view there is no difference whether you use a PIC, AT, 8051 or anything elese .. The most important thing is to set both sides to the same baud rate, the same number of bits in a word (byte) and the same start/stop bit configuration ..
So, in your case, if you need to connect two 8051 using RF modules you will connect at one side microcontroller'sTX pin to the transmitter and at the other side the receiver's output will be connected to RX pin of the other microcontroller ..
Regads,
IanP