POSSIBLE CAUSES:
1)TERMINAL EMULATOR MAY BE SENDING CONTROL CODES (MODEM INITIALIZATION COMMANDS)WHICH WOULD CONFUSE THE AUTOBAUD DETECT OF BASIC-52,HENCE IMPROPER BAUD RATE WOULD BE DETECTED.
2)TERMINAL EMULATOR MUST MATCH LINE SETTINGS EXPECTED BY BASIC-52:
1-START BIT, 8-BIT WORD LENGTH,1-STOP BIT, ASYNCRONOUS,FULL DUPLEX SERIAL COMMUNICATION
3)DATA INVERSION TO/FROM THE SERIAL PORT OR BETWEEN THE MAX232 CHIP AND THE MICRO CONTROLLER CHIP