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46 lines
1.5 KiB
Markdown
46 lines
1.5 KiB
Markdown
node-red-node-rbe
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=================
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A <a href="http://nodered.org" target="_new">Node-RED</a> node that provides
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provides report-by-exception (RBE) and deadband capability.
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Install
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-------
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Run the following command in the root directory of your Node-RED install
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npm install node-red-node-rbe
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Usage
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-----
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A simple node to provide report by exception (RBE) and deadband function
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- only passes on data if it has changed.
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This works on a per **msg.topic** basis. This means that a single rbe node can
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handle multiple topics at the same time.
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###RBE mode
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Outputs the **msg** if the **msg.payload** is different to the previous one.
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Works on numbers and strings. Useful for filtering out repeated messages of the
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same value. Saves bandwidth, etc...
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###Deadband mode
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In deadband mode the incoming payload should contain a parseable *number* and is
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output only if greater than + or - the *band gap* away from the previous output.
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The deadband value can be specified as a fixed number, or a percentage. E.g. 10
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or 5% . If % mode is used then the output will only get sent if the input payload
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value is equal or more than the specified % away from the previously sent value.
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For example - if last sent value was 100, and deadband is set to 10% - a value
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of 110 will pass - then the next value has to be 121 in order to pass (= 110 + 10% = 121).
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This is mainly useful if you want to operate across multiple topics at the same
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time that may have widely differing input ranges.
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Will only accept numbers, or parseable strings like "18.4 C" or "$500"
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