| 摘要 |
PURPOSE:To ensure the communication as a whole even in case the power supply is cut off in one of transmitters connected in series, by using a relay contact circuit which is closed and opened when the power supply is cut off and applied respectively as a by-pass of each transmitter. CONSTITUTION:Communication media 100a and 100b are connected to a circuit connection control part 301 consisting of a relay which is usually closed. Both communication media are connected to each other when the function of a node 300 is stopped in order to eliminate the effect of the node stoppage for a network system. When the node 300 is working, the part 301 separates both media 100a and 100b from each other and connects the node 300 in series to both communication media. |
