RS232 to PIC18F4520 URGENT

[FatahKent]

Hi. Im currently using a PICDEM 2 PLUS board and I need a Optically Isolated RS232 circuit using MAX232 chip. I know that the PIC have its own RS232 chip but I need to come up with a circuit for testing. PLEASE I NEED HELP. All of my circuit designs does not work.

[pebe]

Your question is rather vague. What do you want to test and why do you want optical isolation?

Can you fill in with a few more details?

[FatahKent]

I'm suppose to work on the communication line between PC and a Microcontroller board. I wrote some codes which would ask the user to input a number (from the keyboard) and the microcontroller board would receive it and display the number on the LED (in binary). I want to isolate the power of the PC and the MCT board.