CN113437996A

CN113437996A - Communication method and system of PLBUS-RDM

Info

Publication number: CN113437996A
Application number: CN202110675656.3A
Authority: CN
Inventors: 陈丽恒; 丁元; 刘元成; 刘鲲
Original assignee: Leaguer Microelectronics Co ltd
Current assignee: Leaguer Microelectronics Co ltd
Priority date: 2021-06-18
Filing date: 2021-06-18
Publication date: 2021-09-24
Anticipated expiration: 2041-06-18
Also published as: CN113437996B

Abstract

The invention discloses a communication method of a PLBUS-RDM, which comprises the following steps: s1, the DMX512 master controller is connected with the PLBUS master node, the DMX512 slave device is connected with the PLBUS slave node, and the PLBUS master node and the PLBUS slave node are both connected with a power line, so that the power line replaces a 485 bus in a traditional DMX512 system; s2, supporting and being compatible with the conflict detection mechanism of the existing RDM protocol; s3, supporting a relay forwarding mechanism; and S4, supporting an automatic searching mechanism for the DMX512 slave equipment. The invention realizes the function of the traditional RDM protocol, reduces the use of 485 signal lines, saves the installation cost of the DMX512 system and avoids the damage to the original building environment; meanwhile, mechanisms such as collision detection, relay forwarding, automatic equipment search and the like are adopted, and compared with the traditional DMX512 system, the effective coverage area, the adaptability, the usability and the like of the system are greatly improved.

Description

Communication method and system of PLBUS-RDM

Technical Field

The invention relates to the technical field of communication, in particular to a communication method and a communication system of a PLBUS-RDM.

Background

The PLBUS is a unified communication interface technology of intelligent equipment based on a power line, has the advantages of no need of wiring, wall crossing by wall and no blockage by the wall, and provides an effective communication mode for a plurality of application scenes of the Internet of things. RDM (remote Device management) is a remote Device management protocol, based on DMX 512-A. DMX512(1990) is unidirectional. There is no address information in the DMX512, so the receiving device can receive all data, and as such, as long as the DMX512 device is in use, an address code must be set. Through the RDM protocol, the DMX512 main controller can realize searching and scanning to count the number of DMX512 lamps, return basic information of the lamps and set and inquire information such as DMX512 addresses of the lamps.

The PLBUS-RDM applies the PLBUS communication technology to the DMX512 system, bears the RDM protocol data transmission in the DMX512 system and realizes the function of the RDM protocol.

However, in the prior art, the coverage distance of the traditional DMX512-RDM system is relatively limited, and according to a protocol, relay forwarding is not supported between a master device and a slave device; in addition, when the traditional RDM system is installed, four lines, namely two power supply lines of a master device and a slave device and two 485 buses for data transmission, need to be arranged; sometimes in some scenarios, the arrangement of the 485 bus may cause damage to the existing building, and such a destructive installation may result in the customer directly abandoning the DMX512 system solution.

Disclosure of Invention

The invention aims to solve the problem that the existing DMX512-RDM system is limited, and provides a communication method and system of PLBUS-RDM.

The technical problem of the invention is solved by the following technical scheme:

the invention provides a communication method of a PLBUS-RDM, which comprises the following steps: s1, the DMX512 master controller is connected with the PLBUS master node, the DMX512 slave device is connected with the PLBUS slave node, and the PLBUS master node and the PLBUS slave node are both connected with a power line, so that the power line replaces a 485 bus in a traditional DMX512 system; s2, supporting and being compatible with the conflict detection mechanism of the existing RDM protocol; s3, supporting a relay forwarding mechanism; and S4, supporting an automatic searching mechanism for the DMX512 slave equipment.

In some embodiments, the PLBUS master node and the PLBUS slave node communicate over a power line that powers a DMX512 master-slave device.

In some embodiments, in the step of S2: the PLBUS slave node adopts a CSMA competition sending mechanism; the RDM protocol data sent by the DMX512 main controller is transmitted on a power line through the PLBUS main node; after receiving the data, the PLBUS slave node reports the RDM data to the DMX512 slave equipment connected with the PLBUS slave node; if the DMX512 master needs to reply according to the RDM protocol, the DMX512 slave sends the replied RDM protocol data to the connected PLBUS slave, and the PLBUS slave carries out random competition sending in a specified CMSA time slot; after the CMSA time is over, the PLBUS main node reports all received RDM reply data to the DMX512 main controller; if more than 1 reply data is received, the PLBUS master node generates a superposition level according to the RDM protocol and reports the superposition level to the DMX512 master controller.

In some embodiments, in the step of S3: and the RDM data frame between the PLBUS master node and the target PLBUS slave node is relayed and forwarded by other PLBUS slave nodes in the system.

In some embodiments, the step of S4 includes: s41: when a DMX512 system is initialized, the DMX512 master controller sends an equipment information reporting instruction to all DMX512 slave equipment in a control domain through the PLBUS master node; s42: after receiving the instruction, the DMX512 slave device sends information such as a device UID to the PLBUS master node through a CSMA competition sending mechanism of the PLBUS slave node; s43: and the PLBUS master node reports the collected information such as UID (user identifier) of the DMX512 slave equipment to the master controller, so that automatic search of all the DMX512 slave equipment in the control domain is completed.

Compared with the prior art, the invention has the beneficial effects that: the invention realizes the function of the traditional RDM protocol, reduces the use of 485 signal lines, thus saving the installation cost of the DMX512 system and avoiding the damage to the original building environment.

In some embodiments, the beneficial effects of the invention are as follows: meanwhile, the PLBUS-RDM communication method adopts mechanisms such as conflict detection, relay forwarding, automatic equipment search and the like, and compared with the traditional DMX512 system, the effective coverage area, the adaptability, the usability and the like of the system are greatly improved.

Drawings

FIG. 1 is a schematic diagram of the main steps of a PLBUS-RDM communication method according to an embodiment of the present invention;

FIG. 2 is a block diagram of the system architecture of the PLBUS-RDM communication method of the embodiment of the present invention;

fig. 3 is a block diagram of a conventional DMX512 lamp control system in the prior art;

FIG. 4 is a schematic diagram of a collision detection mechanism supporting and compatible with the existing RDM protocol in the embodiment of the present invention;

FIG. 5 is a schematic diagram of a forwarding mechanism in the PLBUS-RDM communication method according to an embodiment of the present invention;

fig. 6 is a schematic flow chart of an automatic searching mechanism for DMX512 slave devices in the PLBUS-RDM communication method according to the embodiment of the present invention.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the embodiments of the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element. The connection may be for fixation or for circuit connection.

It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the embodiments of the present invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be in any way limiting of the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.

The invention is further described with reference to the following figures and embodiments.

The schematic diagram of the main steps of the PLBUS-RDM communication method of the embodiment of the invention is shown in figure 1, and the main steps comprise: s1, the DMX512 master controller is connected with the PLBUS master node, the DMX512 slave device is connected with the PLBUS slave node, and the PLBUS master node and the PLBUS slave node are both connected with a power line, so that the power line replaces a 485 bus in a traditional DMX512 system; s2, supporting and being compatible with the conflict detection mechanism of the existing RDM protocol; s3, supporting a relay forwarding mechanism; and S4, supporting an automatic searching mechanism for the DMX512 slave equipment.

In step S1, a block diagram of a system structure of the PLBUS-RDM communication method according to the embodiment of the present invention is shown in fig. 2. The system realized by the invention consists of a DMX512 master controller, a PLBUS master node, a plurality of PLBUS slave nodes and DMX512 slave devices with the same number, and carries out communication through power line carriers. A conventional DMX512 lighting system is shown in fig. 3, and is composed of a DMX512 master and a plurality of DMX512 slaves, where the DMX512 slaves are DMX512 lamps, and communication in the conventional DMX512 system is performed on a 485 bus. Compared with the traditional DMX512 system, in the system of the embodiment of the invention, the PLBUS master node is connected with the DMX512 master controller, and each PLBUS slave node is connected with one DMX512 slave device. The PLBUS master node and the PLBUS slave node are directly communicated through a power line for supplying power to the DMX512 master-slave equipment, so that a 485 special communication line in the traditional DMX512 system is omitted.

In step S2, the PLBUS-RDM communication method according to the embodiment of the present invention supports and is compatible with the collision detection mechanism of the existing RDM protocol. In the conventional DMX512 system, the master can use the RDM protocol to send query or setting command to the DMX512 slave devices, and if the number of the DMX512 slave devices responded exceeds 1, the 485 bus in the conventional DMX512 system generates superposition level due to conflict response. When a stack (collision) level is detected, the DMX512 master knows that there are more than 1 slave devices that have responded, and then the DMX512 master readjusts the destination UID range of this occurrence until no stack (collision) level is detected. The PLBUS slave node of the PLBUS-RDM communication method adopts a CSMA competition transmission mechanism, so that the problem of conflict level in the traditional DMX512 system is avoided. Specifically, as shown in fig. 4, the RDM protocol data sent by the DMX512 master device is transmitted on the power line through the PLBUS master node, the PLBUS slave node receives the RDM protocol data and reports the RDM data to the DMX512 slave device connected to the DMX512 slave device, if the DMX512 master device needs to reply according to the RDM protocol, the DMX512 slave device sends the replied RDM protocol data to the connected PLBUS slave device, the PLBUS slave device performs random contention transmission in the specified CMSA time slot, after the CMSA time is over, the PLBUS master node can report all the received RDM reply data to the DMX512 master device, and if the received reply data exceeds 1, the PLBUS master node can generate a superposition (collision) level according to the RDM protocol and report the level to the DMX512 master device.

In step S3, the PLBUS-RDM communication method according to the embodiment of the present invention supports a relay forwarding mechanism. In the system according to the embodiment of the present invention, as shown in fig. 5, the RDM data frame between the PLBUS master node and the target PLBUS slave node may be relayed and forwarded by other PLBUS slave nodes in the system, whereas the conventional DMX512 system does not support relay forwarding. Compared with the traditional DMX512 system, the coverage area of the PLBUS-RDM system with the relay forwarding mechanism is greatly expanded, and theoretically, the maximum communication radius of the system of the embodiment of the invention which is forwarded by 3 levels can exceed 1000 meters.

In step S4, as shown in the flowchart of fig. 6, when the DMX512 system is initialized, the DMX512 master issues an apparatus information report instruction to all DMX512 slaves in the control domain through the PLBUS master node, and after receiving the instruction, the DMX512 slaves send information such as an apparatus UID to the PLBUS master node through the CSMA contention sending mechanism of the PLBUS slaves, and the PLBUS master node reports the collected information such as the UID of the DMX512 slaves to the master, thereby completing automatic search of all DMX512 slaves in the control domain. In the conventional DMX512 system, according to the RDM protocol, the DMX512 master searches for DMX512 slaves in the control domain one by continuously adjusting the address range of the destination UID. Because no CMSA mechanism exists, if conflict exists in the searching process, the address range of the UID is readjusted until no conflict exists, and the address range of the UID is 0 to (2)⁴⁸-1), so the time consuming of DMX512 master node to complete one device search of the full UID address field is relatively long. Therefore, compared with the device searching scheme of the traditional DMX512 system, the efficiency of searching the DMX512 slave device is remarkably improved by the embodiment of the invention.

The communication method of the PLBUS-RDM realizes the function of the traditional RDM protocol, reduces the use of 485 signal lines, thus saving the installation cost of the DMX512 system and avoiding the damage to the original building environment; meanwhile, the PLBUS-RDM communication method adopts mechanisms such as conflict detection, relay forwarding, automatic equipment search and the like, and compared with the traditional DMX512 system, the effective coverage area, the adaptability, the usability and the like of the system are greatly improved.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several equivalent substitutions or obvious modifications can be made without departing from the spirit of the invention, and all the properties or uses are considered to be within the scope of the invention.

Claims

1. A communication method of PLBUS-RDM is characterized by comprising the following steps:

s1, the DMX512 master controller is connected with the PLBUS master node, the DMX512 slave device is connected with the PLBUS slave node, and the PLBUS master node and the PLBUS slave node are both connected with a power line, so that the power line replaces a 485 bus in a traditional DMX512 system;

s2, supporting and being compatible with the conflict detection mechanism of the existing RDM protocol;

s3, supporting a relay forwarding mechanism;

and S4, supporting an automatic searching mechanism for the DMX512 slave equipment.

2. The PLBUS-RDM communication method of claim 1, wherein: the PLBUS master node communicates with the PLBUS slave node through a power line supplying power to the DMX512 master and slave devices.

3. The PLBUS-RDM communication method of claim 1, wherein in the S2 step:

the PLBUS slave node adopts a CSMA competition sending mechanism;

the RDM protocol data sent by the DMX512 main controller is transmitted on a power line through the PLBUS main node;

after receiving the data, the PLBUS slave node reports the RDM data to the DMX512 slave equipment connected with the PLBUS slave node;

if the DMX512 master needs to reply according to the RDM protocol, the DMX512 slave sends the replied RDM protocol data to the connected PLBUS slave, and the PLBUS slave carries out random competition sending in a specified CMSA time slot; after the CMSA time is over, the PLBUS main node reports all received RDM reply data to the DMX512 main controller;

if more than 1 reply data is received, the PLBUS master node generates a superposition level according to the RDM protocol and reports the superposition level to the DMX512 master controller.

4. The PLBUS-RDM communication method of claim 1, wherein in the S3 step:

and the RDM data frame between the PLBUS master node and the target PLBUS slave node is relayed and forwarded by other PLBUS slave nodes in the system.

5. The PLBUS-RDM communication method of claim 1, wherein the step of S4 includes:

s41: when a DMX512 system is initialized, the DMX512 master controller sends an equipment information reporting instruction to all DMX512 slave equipment in a control domain through the PLBUS master node;

s42: after receiving the instruction, the DMX512 slave device sends information such as a device UID to the PLBUS master node through a CSMA competition sending mechanism of the PLBUS slave node;

s43: and the PLBUS master node reports the collected information such as UID (user identifier) of the DMX512 slave equipment to the master controller, so that automatic search of all the DMX512 slave equipment in the control domain is completed.