SOLUTION: In the air conditioner controlled to switch a power relay 84 ON and to switch an indoor transmitting circuit ON in the forcible operation in the communication-failure condition between an indoor communication circuit 2 and an outdoor communication circuit 5, the indoor transmitting circuit...
1. A radio communication system comprising a transmitter (M) for transmitting message frames having a predetermined format and a plurality of transceivers (S1-S6) of which some (S4-S6) but not all are out of range of the transmitter (M) and none of which is out of range of all the ot...