Software to set serial port pin high or low at a given time?

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28 Nov 2003
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I want to set a (true, proper) serial port pin high (or low, doesn't matter) at given precise times to enable an external device. It must be able to start and stop at sequenced set intervals with accuracy to match the PC clock. Does anything exist, my OS is Windows 7 Pro 64 bit. Thanks.
 
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