| 摘要 |
PURPOSE:To allow an announciator itself to control a terminal device directly independently of a master device by adding the announciator to a signal line coupling the master device and each terminal device to relay a transmission signal between the master device and the terminal device and replacing the transmission signal from the master device with a required control signal in the midway of transmission. CONSTITUTION:In transmitting a transmission signal (data 1-3) from the master device 1 to a terminal device, the section of the signal of data 2 is detected by a timing detection generating circuit to transmit the transmission signal from the announciator 4 to a terminal device, a switch means is switched and the transmission signal of the data 4 is transmitted to the terminal device from a transmission data generating circuit. When the transmission time for one packet's share of the data 4 is elapsed, since the switch means is restored, the transmission signal of the data 3 is transmitted after the transmission of the data 4 and the transmission signals (data 1, 4 and 3) are transmitted from the announciator 4 to the terminal device 2 as a result. |
