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Monitor/control communication net with intelligent peripherals

  • US 4,796,025 A
  • Filed: 06/04/1985
  • Issued: 01/03/1989
  • Est. Priority Date: 06/04/1985
  • Status: Expired due to Term
First Claim
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1. Communication net comprisinga pair of communication lines,at least one peripheral device connected to said communication lines including means for receiving a general poll digital message transmitted on said communication lines which message includes a first format code identifying the message as a general poll and an address uniquely identifying the peripheral, means for validating said format code and address, means for monitoring the outputs of one or more devices connected to the peripheral, means for detecting a change in any of said outputs, and means for transmitting a digital message on said communication lines if a change has been detected in said outputs, said last-mentioned message including a second format code, an address identical to said address received by the peripheral, and a data field which indicates the status of said monitored outputs, and wherein said second format code indicates the length of said data field.

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