| 摘要 |
PROBLEM TO BE SOLVED: To provide a system, with which reliability as a system can be secured even against a fault of device in the middle of repetition and further one carrier is enough for carrying radio signals, concerning a repeater system for radio signals to be applied when the distance between a lot of distributedly installed spots and a center for collecting information is larger than the limit of the propagating distance of radio signals. SOLUTION: Plural slave equipments 12 for making sensor information or supervisory and control information into packets and transmitting them to master equipment 11 installed at the center are connected by a linear transmission line, each slave equipment has the radio communication function of a semiduplex system and a function for storing/repeating data made into packets, and the installation interval of adjacent slave equipment is set shorter than the 1/2 arrival distance of radio signals so that the radio signal can over reach. A time slot phase related to the installation position is allocated to each piece of slave equipment, radio transmission can be performed just for this time width, this packet is repeated between the slave equipment like packet relay in time division manner and when a fault is generated at the adjacent slave equipment, the packet is repeated while skipping this slave equipment. |
