Definition of Terms¶
This page lays out a common terminology for discussing the components and underlying technologies used by the platform. The first section discusses capabilities and industry standards that VOLTTRON conforms to while the latter is specific to the VOLTTRON domain.
Software which acts on behalf of a user to perform a set of tasks.
Building Automation and Control network that leverages ASHRAE, ANSI, and IOS 16484-5 standard protocols
- DNP3 (Distributed Network Protocol 3)
Communications protocol used to coordinate processes in distributed automation systems
- IEEE 2030.5
Utilities communication standard for managing energy demand and load (previously Smart Energy Profile version 2, SEP2)
- JSON-RPC (JSON-Remote Procedure Call)
JSON-encoded Remote Procedure Call
Communications protocol for talking with industrial electronic devices
- PLC (Programmable Logic Controller)
Computer used in industrial applications to manage processes of groups of industrial devices
- Python Virtual Environment
The Python-VENV library allows users to create a virtualized copy of the local environment. A virtual environment allows the user to isolate the dependencies for a project which helps prevent conflicts between dependencies across projects.
A message delivery pattern where senders (publishers) and receivers (subscribers) do not communicate directly nor necessarily have knowledge of each other, but instead exchange messages through an intermediary based on a mutual class or topic.
The Publish/Subscribe paradigm is often notated as
pub/subin VOLTTRON documentation.
Open-Source message brokering system used by VOLTTRON for sending messages between services on the platform.
- Remote Procedure Call
Protocol used to request services of another computer located elsewhere on the network or on a different network.
Secure Shell is a network protocol providing encryption and authentication of data using public-key cryptography.
Secure Sockets Layer is a technology for encryption and authentication of network traffic based on a chain of trust.
Transport Layer Security is the successor to SSL.
(also ØMQ) A library used for inter-process and inter-computer communication.
- Activated Environment
An activated environment is the environment a VOLTTRON instance is run in. The bootstrap process creates the environment from the shell.
- AIP (Agent Instantiation and Packaging)
This is the module responsible for creating agent wheels, the agent execution environment and running agents. Found in the VOLTTRON repository in the volttron/platform directory.
- Agent Framework
Framework which provides connectivity to the VOLTTRON platform and subsystems for software agents.
- Bootstrap the Environment
The process by which an operating environment (activated environment) is produced. From the VOLTTRON_ROOT directory, executing python bootstrap.py will start the bootstrap process.
- Config Store
Agent data store used by the platform for storing configuration files and automating the management of agent configuration
Module that implements communication paradigms of a device to provide an interface to devices for the VOLTTRON platform.
- Driver Framework
Framework for implementing communication between the VOLTTRON platform and devices on the network (or a remote network)
Historians in VOLTTRON are special purpose agents for automatically collecting data from the platform message bus and storing in a persistent data store.
VOLTTRON Interconnect Protocol is a secure routing protocol that facilitates communications between agents, controllers, services, and the supervisory VOLTTRON_INSTANCE.
- VIP address
Public address bound to by a VOLTTRON platform instance for communication (Example:
tcp:///192.168.1.20:22916). Communication to external platform instances requires that the address be in range for external communication from the host.
- VIP Identity
Unique identifier for an agent connected to an instance. Used for messaging, routing and security.
- VOLTTRON Central
VOLTTRON Central (VC) is a special purpose agent for managing multiple platforms in a distributed VOLTTRON deployment
The location for a specific VOLTTRON_INSTANCE to store its specific information. There can be many VOLTTRON_HOME`s on a single computing resource such as a VM, machine, etc. Each `VOLTTRON_HOME will correspond to a single instance of VOLTTRON.
A single VOLTTRON process executing instructions on a computing resource. For each VOLTTRON_INSTANCE, there WILL BE only one VOLTTRON_HOME associated with it. For a VOLTTRON_INSTANCE to participate outside its computing resource, it must be bound to an external IP address.
The cloned directory from Github. When executing the command:
git clone https://github.com/VOLTTRON/volttron.git
the top level volttron folder is the VOLTTRON_ROOT.
- Web Framework
Framework used by VOLTTRON agents to implement web services with HTTP and HTTPS