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4-way serial port switch from one to four RS232 ports

4-way serial port switch from one to four RS232 ports
Although a PC can be equipped with four RS232 serial ports, only two of these are available on most machines. Worse, most laptops have just one serial port! The problems are obvious once a lot of equipment has to be hooked up to a serial port. The switch described in this article allows up to four peripheral devices to be connected to one and the same RS232 port.
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