Problem to be solved: to realize a communication device capable of communicating with two kinds of communication systems of communication and radio short distance communication through a pair of communication lines at low cost.A two-way communication apparatus disclosed in this specification, a serial communication terminal connectable to a serial communication line, a Coyle antenna for proximity communication, a serial communication unit, and a signal repeater.A serial communication terminal, a Coyle antenna and a serial communication device are connected to the signal repeater.The signal repeater transmits signals between the serial communication terminal and the serial communication unit and between the Coyle antenna and the serial communication unit.On the other hand, the signal repeater blocks signals between the serial communication terminal and the Coyle antenna.The two way communication apparatus connects the serial communication terminal, the Coyle antenna and the serial communication device with the above described signal repeater, and one serial communication signal is transmitted through a serial communication terminal and Both signals transmitted through the Coyle antenna can be treated.Diagram
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