Hello, I need a help. I have AT89C51ED2 and FLIP programmer. But even if a have connected PC through RS232, nad through MAX 232 to processor I am not able to program it. If I select device and comunication a try to connect.It shows a message Timeout Error. Its on pins Rx and Tx. Is necessary to set any other pins to any voltage? Thank you very much. Cya TomZ