TRANSMITTER-RECEIVER DEVICE, ANTENNA UNIT AND SYSTEM TO BE INTRODUCED INTO SUBJECT

摘要

Disclosed is a transmitter-receiver device (2) which is connected to a plurality of connection objects and transmits and receives signals. The transmitter-receiver device (2) is provided with a connector (20), which is provided on the surface of a receiver main unit (2b) of the transmitter-receiver device (2) and is connectable with an antenna unit (2a) or another connection object but is connected with one connection object at a time. For example, since the connector (20) cannot be connected with another connection object when the antenna unit (2a) is connected thereto, the transmitter-receiver device (2) is capable of performing a processing operation exclusively and surely with a simple configuration.