Control apparatus

A control apparatus configured to receive instruction data from a transmission unit and to control a controlled apparatus based on the instruction data, the control apparatus comprising:

• a register configured to store data for controlling an operation of the controlled apparatus;
• a determination unit configured to determine an error in reception of the instruction data from the transmission unit;
• a communication unit configured to receive instruction data from the transmission unit and to transmit reply data according to a result of determination of the determination unit to the transmission unit, the instruction data including an address of the register to be written and data;
• a storage unit configured to store the instruction data received by the communication unit;
• and
• a control unit configured to, if a content of current instruction data received by the communication unit does not match a content of previous instruction data stored in the storage unit, perform control to write the data included in the current instruction data to the address of the register included in the current instruction data, and if the content of the current instruction data received by the communication unit matches the content of the previous instruction data stored in the storage unit, to perform control not to write the data included in the current instruction data to the address of the register included in the current instruction data.