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Alarm system

  • US 4,991,123 A
  • Filed: 01/06/1989
  • Issued: 02/05/1991
  • Est. Priority Date: 01/06/1989
  • Status: Expired due to Fees
First Claim
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1. A control system having a central processing unit coupled via a bus to a series of peripheral devices, the processing unit adapted to receive data from a first group of the peripheral devices, termed sensor units, and responding to the data received therefrom, comprising:

  • an Electronically Erasable Programmable Read Only Memory (EEPROM) associated with each sensor unit coupled to the bus, the EEPROM having a plurality of memory locations and programmed so as to respond to instructions in the form of binary op-codes sent over the bus from the processing unit to the sensor units;

    the EEPROM programmed with zeros in all memory locations except for an identifying code in a section of memory unique to each EEPROM;

    means within the processing unit for sending a read instruction to the EEPROMs over the bus; and

    means within the processing unit for reading the data placed on the bus by the EEPROMs in response to a read instruction in order to determine which of said sensor units responded to the read instruction.

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