| 摘要 |
A switching device and software therefor are provided to permit two devices connected to the switching device to be interconnected into four different interconnected modes of operation. The devices may be intended for parallel output COM port connection with the computer and the device is controlled from the serial output COM port of the computer using control lines of the serial output COM port to provide switch signals on two of those output lines to, in turn, provide four switching signals for the respective four possible interconnected modes of operation.
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