| 摘要 |
PURPOSE:To reduce number of multiple communication lines to three lines and to simplify the circuit configuration by serially transmitting dial information in system which transmits data from information sources to the information center. CONSTITUTION:At a network controller 31, propriety of dial transfer is judged in response to a call requesting signal from a controller 32, and the controller 31 sends a transfer OK signal to the controller 32. The controller 32 detects this signal and stops the call requesting signal, and then, transfers a serially arranged dial No. and a sampling pulse synchronized to the No. to the network controller 31. The dial No. is transferred to an information center from the network controller 31, and, when the transfer is completed, a transfer termination signal is sent to the controller 32 by opening a switch 22, and then, the dial information of the controller 32 is stopped by stopping the sampling pulse. Therefore, one communication line can be used for the call requesting signal and also for the dial information. Thus the communication lines can be reduced to three. |
