PURPOSE: To smoothly attain the recovery of an error across a longer motion by sensing the matching of a carriage with a stop reference and transmitting a new control signal based on a current configuration space at that time.

CONSTITUTION: An executable control code is down-loaded 123 from an sum 120 to a first processor board 124, and when the down load is completed, the start of a process (program) is executed. Then, a digital/analog converter board 130 is initialized, and a scale and an offset factor for transmitting a proper voltage to a radio control car transmitter 131 are processed. Moreover, a signal is transmitted through an antenna 132 to a carriage to be controlled by the transmitter 131. In this case, a specific stop set point is formed, a stop reference is calculated based on the set point, the matching of the carriage with the stop reference is sensed, and a new control signal based on a current configuration space at that time is transmitted.