Hi,
What your screen shot shows is that the MCU did not respond in any way.
Ok, the RS232 connector seems to be connected correctly.
Here is some points that you should check:
1) Have you got a 9.8 MHz crystal?
That wont do. It must be a 9.8 MHz oscillator.
2) Have you added all the pullups/downs in Table 15-1 in MC68HC908GP32/H?
3) Have you added the Vtst voltage to the /IRQ pin?
4) Have you added the 10 Kohm pullup resistor connected to PTA0?
Well I think that is what people forget the most.
Regards,
Ake