| 摘要 |
PROBLEM TO BE SOLVED: To prevent communication data from being mixed into a general specification apparatus when DC power is fed to the general specification apparatus having no communication with another apparatus from a plug inserted into a receptacle in a system utilizing a DC power circuit transmitting signals. SOLUTION: A DC power line is connected to this DC power circuit by a plug 4 inserted into a receptacle, and the DC power line is used for signal transmission. Identifying means 4b, 13, 14 are provided on the plug 4 and receptacle, and one of a power feed path connecting a power supply and the conductive section of the receptacle via a low-pass filter 10 and a power feed path directly connecting the power supply and the conductive section of the receptacle is selected by a selector switch 11 operated by the identifying means 4b, 13, 14. |
