| 摘要 |
<p>A multiple mode switching device is disclosed which is capable of interconnecting either one of a first or second apparatus (20, 22), such as a controller, to a third apparatus (28) such as a modem or a business terminal, and which is capable of operating in a first mode in which either the first apparatus (20) or the second apparatus (22) can be manually selected for connection to the third apparatus (28); in a second mode in which either the first apparatus (20) or the second apparatus (22) can request connection to the third apparatus (28) and will retain such connection as long as needed; and in a third mode in which a selected one of the first apparatus and the second apparatus (e.g. 20) has priority and will always obtain and retain connection to the third apparatus (28) when needed. First and second manually controlled switches (186, 188) are provided for selecting the mode and the desired apparatus in the manual mode. Logic circuitry (32) is provided for controlling the operation of the switching device (10) in the second and third modes of operation.</p> |
