| 摘要 |
PURPOSE:To allow an indoor equipment to monitor the fault state of an outdoor equipment by providing a notice means informing the presence of a fault to the indoor equipment and informing the fault with an output from a fault detection means of the outdoor equipment. CONSTITUTION:A 1st comparator 38 in the inside of an outdoor equipment 21 discriminates the presence of a transmission input signal and a 2nd comparator 38 discriminates the presence of a transmission output signal, and an output of an EX-OR circuit 40 represents the presence of a fault relating to the correlation of the transmission input and output signal. An H representing the result of diagnosis of a fault item to be monitored in the fault state is inputted to the input of an OR circuit 41 and an L level and an L level representing that in the normal state is inputted thereto, and an output of the OR circuit 41 goes to H when a fault takes place in any of fault diagnostic items to drive a transistor(TR) 42 and to light a light emitting element 44 in an indoor equipment 20 thereby informing the occurrence of the fault. Thus, the fault of the outdoor equipment is found out early and the reliability of the outdoor equipment is improved. |
