A selector box for switching between RS232 ports is disclosed. A single host terminal is provided and a plurality of channel terminals are provided. In a first mode, a command comes from the host terminal determining which of the channel terminals the host terminal will be connected to. In a second mode,...http://www.google.de/patents/US4866667?utm_source=gb-gplus-sharePatent US4866667 - Switching device for a plurality of RS232C interfaces
