| 摘要 |
In a communication system for performing the transmission and reception of data among a plurality of equipment, a communication control apparatus for governing the transmission and reception of data is connected to each of the equipment. Each of the communication control apparatus includes a transmitting and receiving device for the transmission and reception of electric signals, an optical transmitting device for converting the electric signal received by the transmitting and receiving device to a light signal and delivering it, an optical receiving device having an output terminal wired-OR connected between the transmitting and receiving device and the optical transmitting device whereby a light signal from the other apparatus is received, converted to an electric signal and delivered to the transmitting and receiving device, and a device responsive to the electric signal produced from the optical receiving device to prevent the output signal of the optical receiving device from being looped back to the optical transmitting device.
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