Bidirectional communication apparatus for transmitting/receiving information by wireless communication or through a power line

摘要

Full duplex communication is attained by using only one communication channel in wireless communication between a host computer 1 and a printer 6. The communication from the host computer 1 to the printer 6 is effected by wireless, and the communication from the printer 6 to the host computer 1 which includes a small amount of information is effected through a power line 9.