Circuit monitoring device
DCFirst Claim
Patent Images
1. A method of monitoring the status of a measurable parameter of an electrical circuit, including the steps of:
- measuring the magnitude of said parameter and generating an analog signal representative of said magnitude;
passing said analog signal to an analog to digital converter;
generating by the analog to digital converter a count value representative of said magnitude;
comparing said count value with a threshold value and assigning from the comparison a status signal, said status signal having two possible values which thereby indicates whether the count value is greater than or less than said threshold value;
transmitting said status signal via a communications network to a display; and
displaying on the display an indication of the value of the status signal.
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Abstract
The circuit monitoring device is disclosed. The device is for monitoring circuit resistance. At configurable thresholds digital flags are triggered, the device can be used as a Security/Building management system. The device uses open technology is fully scaleable and allows programmable logic controllers to be used as security management systems. Using a soft logic option a PC could take the place of the PLC.
12 Citations
24 Claims
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1. A method of monitoring the status of a measurable parameter of an electrical circuit, including the steps of:
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measuring the magnitude of said parameter and generating an analog signal representative of said magnitude; passing said analog signal to an analog to digital converter; generating by the analog to digital converter a count value representative of said magnitude; comparing said count value with a threshold value and assigning from the comparison a status signal, said status signal having two possible values which thereby indicates whether the count value is greater than or less than said threshold value; transmitting said status signal via a communications network to a display; and displaying on the display an indication of the value of the status signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. Apparatus for monitoring the status of a measurable parameter of an electrical circuit, the apparatus comprising:
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measurement means for measuring the magnitude of said parameter and generating an analog signal representative of said magnitude; analog to digital conversion means for generating from said analog signal a count value representative of said magnitude; comparison means for comparing said count value with a threshold value and generating from the comparison a status signal, said status signal having two possible values which thereby indicates whether the count value is greater than or less than said threshold value; transmission means for transmitting said status signal via a communications network to a display; and display means for displaying an indication of said assigned status. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. A building security management system comprising:
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an electrical circuit containing a switchable element, the circuit including a first resistive component in series with the switchable element and a second resistive component in parallel with the switchable element such that the status of the switchable element is reflected in the electrical resistance of the circuit; measurement means for measuring said resistance of the circuit and generating an analog signal representative of said resistance; comparison means for comparing said count value with a threshold value and generating from the comparison a status signal, said status signal having two possible values which thereby indicates whether the count value is greater than or less than said threshold value; transmissidn means for transmitting said status signal via a communications network to a display; and display means for displaying an indication of said assigned status and is thus of said switchable element. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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Specification