Communication device and communication system

摘要

A communication device capable of preventing interference due to collision of signals of a plurality of communication devices (slaves) is provided. The communication device characterized by having a receiving part which receives a request signal by radio, a counter which starts count of a count value on reception of the request signal, a comparing part which compares the count value and a comparison value, and a transmitting part which transmits an acknowledge signal by radio in accordance with a result of the comparison is provided.