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Software to close a relay at a given time via serial port?
I am looking for some simple software to enable, at a given time to within a second or so, derived from the PC time, activate a relay or semiconductor switch via a true serial port. Does anyone know of anything like that please? Ideally it would be able to open the relay at a later time. Just two time based changes of state would be adequate in a 24 hour period. Thanks. OS is 7 64 bit pro.