No under events, there are different options when an event is triggered. Email, set point value, run external process,excel report, report -> Set to Set point
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Then add the same context points you use in your meta data source script, the target point being what you normally send data down via your meta point -> your bacnet point
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Set to scripted action:
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Input the same code you would for your meta datapoint script and return the value that the bacnet point should receive.
This will then fire when the event is triggered.