| 摘要 |
PROBLEM TO BE SOLVED: To provide a communication method capable of suppressing its cost and its area, preventing malfunctions due to noise, and communicating at a high speed with connecting a number of slave stations. SOLUTION: Electric power supply and data transmission/reception are separately performed by time division. During electric power supply, switches B, C, F, and G are turned on altogether, and a capacitor 202 is charged with electric power (first mode). During transmission, the switches B, C, F, and G are turned off altogether, data with an address are transmitted from a master station 1 to a plurality of slave stations 2 via transmission lines 3 and 4 (second mode). During reception, a slave station 2 matched with the address transmits back a response data to the master station 1 (third mode), and after the master station 1 completes reception, the switches B, C, F, and G are turned on again altogether, and goes to an electric power supply status (first mode). Subsequently, this procedure is repeated. As a result, since communication and power supplying are carried out at different times, radio signal will not overlap during electric power supply. COPYRIGHT: (C)2005,JPO&NCIPI
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