To prevent fraudulent actions without increase in load onto controllers of each board and to improve the degree of freedom in the layout of a control device.

A communication system is provided to a control device M3 comprising: a casing M31 provided with a casing-side control board M1; and a front door M32 mounted to the casing M31 in an openable and closable manner and provided with a front-door-side control board M2. The casing-side control board M1 comprises: a casing-side communication LSIM12; and a casing-side radio communication unit M13 for transmitting encoded processing data in a signal form of a radio signal to the outside. The front-door-side control board M2 comprises: a front-door-side radio communication unit M23 for receiving the radio signal of processing data; and a front-door-side communication LSIM22.