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ANSI/ASHRAE Standard 135-2012

A Data Communication Protocol for Building Automation and Control Networks

Provides a comprehensive set of messages for conveying encoded binary, analog, and alphanumeric data between devices including, but not limited to: (a) hardware binary input and output values, (b) hardware analog input and output values, (c) software binary and analog values,( d) text string values, (e) schedule information, (f) alarm and event information, (g) files, and (h) control logic.

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American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. [ashrae]

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