GB/T 28847.5-2021Building automation and control systems - Part 5: Data communication protocol (English PDF)

3.1 Abstract syntax

The application layer data or application protocol control information uses the regulations to be followed by the symbolic rules independent of the coding technology that represents them.

3.2 Application

A collection of user information processing requests.

3.3 Application-entity

The OSI-related part of an application process.

3.4 Application-process

An element of a specific application for information processing in an open system.

3.5 Application-protocol-control-information

Use presentation layer services to coordinate the exchange of information between application entities that connect operations.

3.6 Application-protocol-data-unit

The data unit specified in the application protocol includes application protocol control information and so on.

3.7 Application-service-element

When appropriate, the OSI environment is provided through the use of lower-layer services, part of the application entity.

3.8 Concrete grammar

concretesyntax The specific realization of a certain data representation is used in the grammatical rules in the formal specification of the data.

3.9 Confirm(primitive)

An interactive representation in which a service provider indicates that certain procedures have been completed on a specific service access point.

3.10 Indication(primitive)

An interactive representation in which the service provider either indicates that it has actively requested some procedures, or indicates that a procedure has been Requested by the service user at the access point of the peer-to-peer service.

3.11 Peer-entities

Entities at the same layer in the protocol.

3.12 Real open system

A real system that complies with the requirements of the OSI standard when communicating with other real systems.

3.13 Real system

A collection consisting of one or more computers, related software, external software, terminals, operators, physical processes, information transmission methods, etc.

Note: It is an autonomous whole with the ability of information processing and information transmission.

3.14 Request(primitive)

In the interaction, the service user requests the execution of some procedures in an interactive representation.

3.15 Response(primitive)

In the interaction, the service user indicates that it has completed some procedures.

3.16 N-layer service access point (N)-service-access-point

The Nth layer entity provides the access point of the Nth layer service to the N-1th layer entity.

3.17 Nth layer service data unit (N)-service-data-unit

The interface data of the Nth layer maintains consistency in the Nth layer communication.

3.18 Service-user

An entity in a single open system that uses a service through a service access point.

3.19 Service-primitive

The interaction between service users and service providers is an abstract representation that has nothing to do with concrete realization.

3.20 Service-provider

An abstraction of all entities that provide services to peer-to-peer service users.

3.21 Transfer-syntax

The specific syntax used for data transfer between open systems.

3.22 User element

A representation of a certain part of an application process that uses required application service elements in order to achieve the communication purpose of the application process.

3.23 Access control

Adjust and restrict access to network resources.

3.24 Access rights (physical access control)

accessrights (physicalaccesscontrol) Give access privileges to a certificate.

3.25 Access user (physical access control)

accessuser (physicalaccesscontrol) A person or device that holds one or more certificates.

3.26 Alarm

In the form of sound or vision or both, it is a warning to the human operator of an abnormal working condition that may need to be corrected Announcements.

3.27 Alarm-acknowledgment

Indicates a process that a human operator has viewed and reacted to event notifications.

3.28 Algorithmicchangereporting

Based on an algorithm specified in an EventEnrolment object, an alarm or event is detected and reported.

3.29 Authentication

The act of verifying identity.

3.30 Authentication factor

The data element used to prove the identity of the certificate.

3.31 Authentication(networksecurity) authorization(networksecurity)

Based on known identities and access rules, access to network resources is controlled.

3.32 Authentication (physical access control) authorization (physicalaccesscontrol)

The process of determining whether a certain access user is allowed to enter a certain protected area through an access control point.

3.33 BACnet device

A real or virtual device that supports digital communication using the BACnet protocol.

3.34 BACnet user

BACnet-user Use the BACnet user element to represent a part of the application process.

3.35 Blink-warn

A typical method in lighting control to notify the occupants of the room that the light is about to be automatically turned off.

Note: In the process, the lights may flash one or more times, or produce an acoustic signal. After the alarm occurs, the room lighting will be maintained for a period of time to The occupants must either leave the room safely or initiate a request to maintain the room's lighting. Flashing alarms are also called "flick alarms" or "flashing alarm".

3.36 Bridge

At the physical layer or data link layer, devices that connect more than two network segments.

Note: The device can perform packet filtering based on the MAC layer address.

3.37 Broadcast

A message that is applied to multiple devices as a single unit.

3.38 State change

changeofstate An event that occurs when the tested or calculated Boolean value or discrete enumeration value changes.

An event that occurs when the tested or calculated analog value is changed by a predefined value.

3.39 Change of value

3.40 Client

A system or device uses another device through a service request instance for some special purpose.

Note: The client requests service from the server.

3.41 Controller

Equipment that adjusts or manages systems or components.

3.42 Credential(physicalaccesscontrol)

The combination of authentication factor and access authority.

3.43 Dataconfidentiality

For illegal individuals, entities, or processes, the nature of the inaccessibility or disclosure of information.

3.44 Data integrity

The nature of data that cannot be altered or destroyed by illegal means.

3.45 Data source identification

The act of confirming whether the source of the data received is the source of its claim.

3.46 Datepattern

A date that contains more than one unspecified byte or specific date value.

3.47 Directly connected network

A network that can be directly accessed through a router, without the need for an intermediate router to forward packets.

Note: When the PTP connection is valid and no intermediate router is used, the PTP connection is a direct connection network.

3.48 Download

A specific type of file transfer that transfers executable programs or databases to a remote device, where these programs The sequence or database can be executed.

3.49 Encryptedmessage

Text or signals that cannot be directly understood through the cryptographic system.

3.50 Entity

An identifiable, independent and distinguishable existence that can be described by a set of attributes.

3.51 Error detection

A procedure used to identify whether an error occurred in the communication process.

3.52 Error recovery

Procedures activated by detected errors are used to ensure that the exchange of information continues.

3.53 Event algorithm

The algorithm used to determine the event-initiating (event-initiating) object to switch between normal and abnormal states.

3.54 Event-initiating object

It can be used to monitor its own status and report changes in event status.

3.55 Event-notification-distribution

When the object changes the event or confirm state, the server executes the decision to notify the client and send the information.

3.56 Event notification message

ConfirmedEventNotification used to indicate a change in the confirmed state of an event or an event-initialized object Or UnconfirmedEventNotification service request.

3.57 Event-state-detection

Execute object event algorithm and monitor the progress of object properties.

3.58 Event-summarization

Use one of the event summary services to query the event-initialization object in the device to determine which event-initialization object satisfies the characteristics. Determine the event status or report conditions.

3.59 Fading

The actual output gradually increases or decreases from one set value to another within a certain period.

3.60 Gateway

Devices that connect two or more different networks, allowing information to be exchanged between these networks.

3.61 Global

All devices or nodes on the communication network.

3.62 Globalbroadcast

A message sent to all the networks or nodes on a BACnet Internet.

3.63 Half router

A device or node at one end of a PTP connection.

3.64 Incapabledevice

Essentially incapable, or configured as a device that is incapable of generating and consuming secure BACnet messages.

3.65 Initialization

The process of establishing a known state caused by power-up.

3.66 Internet work

A collection of more than two networks connected by a router.

3.67 Internal reporting

The detection and reporting of alarms or events is based on the algorithm specified in the object type. Does not involve external to the EventEnrolment object Reference.

3.68 Invertednetwork

In the BACnet Internet, there are more than two networks connected by one network, and the relevant NPDU size is smaller than the network it joins.

3.69

A sequence of symbols that controls encryption and decryption operations

3.70 Local

Related devices on the same network as the reference device.

3.71 Localbroadcast

A message sent to all devices or nodes on the same network.

3.72 Medium

Physical transmission entity. Twisted pair, optical fiber and coaxial cable are typical media.

3.73 Medium access control

The process of maintaining the order of access to the communication medium.

3.74 Network

A collection of more than one network segment with the same network address connected by a bridge.

3.75 Network resource

Any physical or logical entity that can be accessed through a communication medium.

3.76 Node

An addressable device connected to a communication medium.

3.77 Notification-client

The BACnet device that receives and processes event notification messages.

3.78 Notification-server

Contains events-BACnet devices that initialize objects and perform event notification distribution.

3.79 Object

Specific instances of data classification.

3.80 Objectprofile

The configuration defines a composition consisting of attributes, behaviors, and/or requirements for a private object, or private extensions to a standard object set.