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virgin user, flashing 89C51RD2

i've just got my MCBx51 board, and try (seriuosly unsuccessful) to download my source to the 89C51RD2 (both with µVision2 nor with FLIP) i never get a connection via RS232.
where is the problem
I tryed several combinations of DIP switch settings and Int/Ext RS232 UART. Also in combination wit AppNote 156 - no result !"!
Is ther anyone to give me the right setup of MCBx51 and maybe some SW setups.

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