ClimateTalk is an open standard that defines a set of messages and commands to enable interoperability, enhanced user interface, and machine-to-machine control independent of the physical layer connecting the devices.

The messages and commands defined by the ClimateTalk Information Model (CIM) are the presentation and application layers as defined by the OSI Model . ClimateTalk applications are fully defined at Layer 7 of the OSI model by a combination of a device-specific application profile, the Generic Application Specification, and the command reference. 

ClimateTalk messages can be carried over any physical medium following the OSI model. The ClimateTalk presentation layer defines how messages are executed over the various physical mediums in use.

CT-485 and CT-LWP are wired serial physical and network layers designed to support the formation of ClimateTalk networks and transport ClimateTalk messages, but other OSI based protocols, including wireless transports, can be used, as well.

This document provides a single repository for all control commands and messages in the ClimateTalk Common Information Model. ClimateTalk applications are fully defined at Layer 7 of the OSI model by a combination of a device-specific application profile, the Generic Application Specification, and this document.

The ClimateTalk Open Standards package shown in Figure 1 prescribes the mandatory requirements to ensure proper network formation of interoperable devices. Membership in the ClimateTalk Alliance, as well as successful completion of mandatory conformance testing, is required for listing a product as a ClimateTalk certified device.

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