Microcontroller › 8051 › Problem in interfacing RFID module with AT89C51, need help ! › Hi Shafie, Make sure you’ve
Make sure you’ve set the baud rate at 9600.
Have you checked your module with hyperterminal?
Are you using same power supply for the module and mcu? If not short the ground of both.
Check your max 232 –
short the tx and rx pin of max232 that goes to the mcu, disconnect the reader and connect the serial cable from the pc, and type something on the hyperterminal, use should get the same characters back in the hyperterminal.