The present invention provides a radio controlling apparatus that performs
a change to a vacant channel rapidly to allow smooth control even if an
uncontrollable state due to radio interference suddenly occurs. In a radio
controlling transmission apparatus of the radio controlling apparatus, a
reception section for searching a vacant channel is provided. When a
vacant channel is detected, it is stored in memory of the radio
controlling transmission apparatus. A transmission section transmits
control signals, a selection code, and vacant channel data, the control
signals being output by an operation section using a control signal
transmission timer and a selection code transmission timer. Using a
reception section, a controlled apparatus of the radio controlling
apparatus receives signals. If the vacant channel data and the selection
code are received, the controlled apparatus stores them in memory of the
controlled apparatus. If control signals are also received, the control
signals are sent to a controlled section via a decoder. However, if the
selection code is not received by the controlled apparatus for the
duration of a selection code holding timer, control abnormality is
determined to have occurred. A visible abnormal operation is performed and
a reception channel of the controlled apparatus is changed to the vacant
channel stored in the memory of the controlled apparatus. In the radio
controlling transmission apparatus, a change to the vacant channel is
performed and the selection code is transmitted. When the selection code
is detected by the controlled apparatus, control of the controlled
apparatus is performed using the vacant channel thereafter.
