How to send data using rs232?

Thanks for your reply.

i think that my sensor is not generating the right data , it just produce pulses, it is maximum voltage is 1.2V ,and the minimum voltage is .5V .

what i don't understand is how to make the FPGA(Altera DE2-70) broad understand these pulses? and count only the pulses with the maximum voltage.

and do you think in that case that the rs232 will be the best choice for me or do you recommend something else ?

Kindly Note : am using verilog language ,and Quartus ii to download the code on the fpga.

thank you for your help .