| 摘要 |
PURPOSE:To attain a simple and inexpensive wiring work in case a signal generating part is remote or decentralized by providing a main body part serving as a master device and plural terminal parts as slave devices. CONSTITUTION:A device 100 serves as a main body part where data are collected and processed; while devices 200 and 300 serve as terminal parts containing interface circuits for input of process signals. Then the connection is possible among plural devices via transmission lines 80-82 like twist paired line, etc. and a crossover wiring. A general-purpose interface board 210, for example, serves a digital signal interface like a contact, etc. An external contact signal 211 is received by an interface part 212 and converted into a signal of an IC level. This signal is delivered to a data bus 201. A control circuit 213 controls the fetching order of the signals of the digital interface circuit 210 by the signal of a control bus 202.
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