| 摘要 |
PURPOSE:To perform the transfer of line signals before lapse of the recognition time of the line signal in order to shorten the transfer signal at the multi-step repeating exchange from the preceding to next circuit or vice versa. CONSTITUTION:Receiver 51 within signal unit 5 transmits line signal F1 or F2 sent from the next circuit to central controller CC via scan circuit 7, and also transmits signal SP1 and SP2 in the same way if the line signal continues more than the fixed time T1 and T2. Controller CC, when receiving signal SP1, transmits immediately transmission command SF1 or SF2 of signal F1 or F2 to the transmitter similar to transmitter 52. Thus the transmitter transmits the line signals. With reception of signal SP2, CC recognizes that the line signal is effective to continue the transmission of the line signals to the preceding circuit. However, in case the line signal is not effective, the transmission of the line signals to the preceding circuit is stopped immediately. |
