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 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 defines the specific application requirements for a Zoning subsystem designed to ClimateTalk Open Standards to control, operate, and monitor an HVAC system in multiple zones.  This profile builds on the Generic Application Specification defining requirements common to all ClimateTalk enabled devices.

The ClimateTalk Open Standards package shown in Figure 1 - OSI Layers for ClimateTalk Implementation Figure 1prescribes 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. 

This zoning profile shall define the necessary interaction requirements between the following subsystems and ClimateTalk CIM:

- Zone Controller
- Zone User Interface
- Zone Temperature Control

This zoning profile also defines the following subsystems without any interaction requirements between the subsystem and ClimateTalk CIM:

- Zone Damper
- Occupancy Sensor
- Remote Temperature Sensor
- Supply Air Temperature Sensor
- Return Air Temperature Sensor
- Outside Air Temperature Sensor

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