How to set rs232?

Dear all,

I'm using a 68hc11 development board for my project. The MCU is connected to a reader through a serial port DB9.
I need to reset the reader by setting the pin#4 of DB9 high and then Set the pin#4 of DB9 back to low state. So, can someone help me on how to set a pin on DB9 either high or low?

Thanks.

Regards,
jack
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