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PCT Messaging Design

This document outlines the essential messages and data payloads mandated by the CEC Title 24 PCT Specification. It details two primary system event modes: Price and Emergency Events. The specification emphasizes event identification, time-stamping, and the importance of event IDs for effective communication. It discusses mechanisms for addressing events, facilitating event cancellation, and ensuring message transport reliability. Additionally, it covers utility directives for reliability and temperature control during emergencies, enabling robust communication and operational efficiency within the PCT framework.

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PCT Messaging Design

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  1. PCT Messaging Design CEC Title 24 Reference Design

  2. Introduction • Description of Messages & Data Payloads Required for the CEC Title 24 PCT Specification • Messages Recognize Two Basic System Event Modes • Price Events • Emergency Events.

  3. Data Classes for Most Messages • Addressing • Event Identification • Time Stamping • Event ID Importance • Facilitate cancellation of events • Permit multiple event transmissions for message transport reliability

  4. Addressing Scheme Enables Regional or PCT Level Filtering • Place holder for value added information to facilitate PCT side filtering • Two Levels of PCT Operational Status Visual Indication Possible • Underlying Physical Communication Layer • e.g. – carrier heartbeat • Derived from the last valid message received • Clock Sync Message • PCT displays error message if a valid time sync not received in 24 hr period

  5. Price Events • Utility desire to communicate a “super peak rate” period is in effect either by: • Simple message that price is in effect • Explicit price • Price event message definition • Start and stop time & the price • If the price field = zero then a generic super-peak event with no specific price

  6. Consumers PCT has default response to price event, but customer may override programming • PCT Vendors have design flexibility for owner response and / or event & price information

  7. Reliability Events • Provides Utilities specific directives to PCT to address reliability • Start and Stop Time • Advance Scheduling • Reliability Selections • Change Temperature • Set Temperature

  8. Emergency Event – Special Reliability Class • Coded separately to facilitate expedited handling • For example • Normally, PCT events could be cached in area concentrator; then forward when network traffic permits • Area concentrator inspects message header and if emergency detected forwards message immediately with potential auto retransmissions

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