Communication circuit, relay connecting circuit, and communication network
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United States of America Patent
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Jun 23, 2015
Grant Date -
Jul 21, 2011
app pub date -
Dec 30, 2010
filing date -
Jan 15, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A communication circuit, a relay connecting circuit, and a communication network transmit/receive contact signals usable for automatic control. A transmitting section transmits a contact signal input into an input/output section to a communication line, and a receiving section receives a signal via the communication line. An input/output circuit outputs the contact signal received by the receiving section via the input/output section and performs an interlocking function to prevent input of another contact signal via the input/output section. A time division communication control section switches a communication direction among the transmission section, the receiving section and the input/output circuit at a time-divided timing.
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