Patent ID: 7349347

Claim:
An ASK communication device for making data communication among respective stations by using an ASK mode, comprising: a master station; and at least one slave station connected to the master station through a bus line, wherein the master station comprises: an oscillation circuit for outputting a carrier signal with a desired frequency; a transmission unit for ASK-modulating the carrier signal outputted from the oscillation circuit and outputting, to the bus line, ID signals identifying the respective stations and data transmitted to the slave station in a case of transmitting the data from the master station, and outputting the ID signal of the slave station serving as a transmission source and the carrier signal to the bus line in a case of transmitting data from the slave station; and a master-side reception unit for receiving the data transmitted from the slave station through the bus line, and the slave station comprises: a slave-side reception unit for receiving the data transmitted from the master station and another slave station; and an attenuation unit for attenuating the carrier signal outputted from the master station to the bus line and generating an ASK modulation signal in a case of transmitting the data from the slave station.