| 摘要 |
An update program is acquired in a main body device from an external device, a generation of noise from a noise generating source that has possibility to generate noise to a communication between the main body device and the slave device is suppressed, and after that, a slave device update program is transferred from the main body device to the slave device in the second communication method (second communication speed) which is faster than the first communication method (first communication speed). |
