Importance

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Abstract

There is disclosed a multiplexer for communicating between plural first apparatuses and a second apparatus. The multiplexer comprises plural receiver for receiving data transmitted from plural first apparatuses and outputting the received data through a first switch to the second apparatus, respectively, plural transmitter for transmitting data received through a second switch from the second apparatus to plural first apparatuses, respectively, and a controller for controlling the first and second switches, which is operable in first and second operation modes. In the first operation mode, the controller enables the first switch to selectively switch over plural receiver when a predetermined condition is effected, and enables the second switch to selectively switch over plural transmitter accompanying with enabling the first switch. In the second operation mode, the control means enables the second switch to selectively switch over plural transmitter according to data received from the second apparatus.

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First Claim