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DELL PRECISION M70 SERIAL PORT

HI,
The serial port of my computer does not work.
I test it using the hyperterminal an jumping the 2 an 3 pins.
In order to have another COM port install a USB-SERIAL adapter but it only works when the utility program is running in windows.
I have 5 old PLC'S that can only be reprogrammed using DOS but i can't enable the communication.

I hope you can explain me what can i do to fix that problem.

PD: Sorry if my english is not very good.

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