CN112437061B - Out-of-band communication method, system, storage medium and device based on DMX512 protocol - Google Patents
Out-of-band communication method, system, storage medium and device based on DMX512 protocol Download PDFInfo
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- CN112437061B CN112437061B CN202011256724.4A CN202011256724A CN112437061B CN 112437061 B CN112437061 B CN 112437061B CN 202011256724 A CN202011256724 A CN 202011256724A CN 112437061 B CN112437061 B CN 112437061B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/03—Protocol definition or specification
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
Abstract
The invention provides an out-of-band communication method, a system, a storage medium and a device based on a DMX512 protocol, which comprise the following steps: constructing a logical relation between the field interval bit length and the bit information of the DMX512 main data; based on the logical relationship, the bit length of each field interval sequentially indicates the bit information of the DMX512 auxiliary data, so as to realize the out-of-band communication of the DMX512 auxiliary data during the transmission of the DMX512 main data. The method, the system, the storage medium and the device for out-of-band communication based on the DMX512 protocol realize the out-of-band communication of the auxiliary data based on the physical layer of the DMX512 main data link, have stable communication quality and have no additional cost.
Description
Technical Field
The present invention relates to the field of out-of-band communication technologies, and in particular, to an out-of-band communication method, system, storage medium, and apparatus based on the DMX512 protocol.
Background
The DMX512 protocol is a data dimming protocol proposed by the united states stage light association (USITT), which provides a protocol standard for communication between a light controller and light fixtures. The protocol can be used to control asynchronous serial digital data transmission of lighting devices and accessories, with the latest version of DMX512-a defining two data links, a primary data link and a secondary data link. The DMX512 protocol defines the physical layer and the protocol layer of a main data link in detail, data is transmitted on an EIA-485 bus at the rate of 250kbit/s, and the DMX512 protocol does not specifically define an auxiliary data link.
In conventional applications, the DMX512 protocol is mainly used to transmit channel data of a controlled device in a single direction. In practical applications, it is also desirable to be able to transmit some auxiliary data for system management and configuration.
In the prior art, there are two main schemes for auxiliary data transmission under the DMX512-a protocol:
1. remote Device Management protocol (RDM) over a main data link
However, this solution has the following drawbacks:
(1) Part of the existing equipment is not compatible with the latest DMX512-A protocol, and cannot distinguish DMX data frames from RDM data frames, so that false operation occurs;
(2) A competition relationship exists between the DMX data frame and the RDM data frame in the sending and scheduling process, so that the frame rate stability of the DMX data frame is easily influenced;
(3) The RDM protocol does not avoid the occurrence of bus signal collision per se, and brings a large stability risk to normal DMX512 channel data transmission.
2. Vendor-defined data protocol for transmission of auxiliary data links
However, this solution has the following drawbacks:
(1) The specific definition of the auxiliary data link has no unified standard, so that various formats are generated and cannot be used uniformly;
(2) The DMX512-a protocol in actual use typically employs a 3-core cable and cannon connector, with no auxiliary data link.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, it is an object of the present invention to provide an out-of-band communication method, system, storage medium and apparatus based on DMX512 protocol, which implement out-of-band communication of auxiliary data based on the physical layer of the DMX512 main data link, with stable communication quality and no additional cost.
To achieve the above and other related objects, the present invention provides an out-of-band communication method based on DMX512 protocol, comprising the steps of: constructing a logical relation between the field interval bit length and the bit information of the DMX512 main data; based on the logical relationship, the bit length of each field interval sequentially indicates the respective bit information of the DMX512 auxiliary data, so as to realize the out-of-band communication of the DMX512 auxiliary data when the DMX512 main data is transmitted.
In an embodiment of the present invention, the auxiliary data includes auxiliary information and verification information.
In an embodiment of the present invention, the check information is cyclic redundancy check data of the DMX512 auxiliary data.
In an embodiment of the invention, the number of the fields of the DMX512 main data is not less than 512.
In an embodiment of the present invention, the logical relationship is: when the bit length of the field interval is greater than or equal to a preset bit length, the bit information of the DMX512 auxiliary data is a first numerical value; and when the bit length of the field interval is less than the preset bit length, the bit information of the DMX512 auxiliary data is a second numerical value.
In an embodiment of the present invention, the predetermined bit length is 1; the first and second values are 0 and 1 or 1 and 0.
In an embodiment of the present invention, if DMX512 data transmitted by a device that does not support out-of-band communication based on the DMX512 protocol is received, it is determined based on the frame check that the data indicated by the bit length of the field interval is invalid.
Correspondingly, the invention provides an out-of-band communication system based on the DMX512 protocol, which comprises a construction module and a communication module; the construction module is used for constructing the logical relation between the field interval bit length and the bit information of the DMX512 main data; the communication module is used for sequentially indicating each bit information of the DMX512 auxiliary data by the bit length of each field interval based on the logical relationship so as to realize the out-of-band communication of the DMX512 auxiliary data when the DMX512 main data is transmitted.
The present invention provides a storage medium having stored thereon a computer program which, when executed by a processor, implements the above-described out-of-band communication method based on the DMX512 protocol.
Finally, the invention provides an out-of-band communication apparatus based on the DMX512 protocol, comprising: a processor and a memory;
the memory is used for storing a computer program;
the processor is configured to execute the computer program stored in the memory to enable the DMX512 protocol-based out-of-band communication apparatus to perform the above DMX512 protocol-based out-of-band communication method.
As described above, the out-of-band communication method, system, storage medium and apparatus based on DMX512 protocol of the present invention have the following advantages:
(1) The out-of-band communication of the auxiliary data is realized on the basis of the physical layer of the DMX512 main data link, and no additional cost is caused;
(2) The implementation of out-of-band communication is transparent to the DMX512 protocol layer, so that the compatibility problem is avoided, and the stability of the communication quality is ensured;
(3) The auxiliary data are coded in the DMX data frame transmission process, and the control and the stability of the original data frame rate are not influenced.
Drawings
FIG. 1 is a schematic diagram illustrating the timing of DMX512 data transmission in one embodiment;
FIG. 2 is a flow chart illustrating an out-of-band communication method based on DMX512 protocol according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an out-of-band communication system based on DMX512 protocol according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an out-of-band communication apparatus based on DMX512 protocol according to an embodiment of the present invention.
Description of the element reference
31. Building block
32. Communication module
41. Processor with a memory for storing a plurality of data
42. Memory device
Detailed Description
The following embodiments of the present invention are provided by way of specific examples, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the drawings only show the components related to the present invention rather than being drawn according to the number, shape and size of the components in actual implementation, and the type, amount and proportion of each component in actual implementation can be changed freely, and the layout of the components can be more complicated.
In computer networks, out-of-band data is data that is transmitted by a stream that is independent of the main in-band data stream. The out-of-band data mechanism provides a conceptually independent channel that allows any data sent through the mechanism to be kept isolated from the in-band data. The out-of-band data mechanism should be provided as an inherent feature of the data channel and transport protocol rather than requiring the establishment of separate channels and endpoints. The out-of-band communication method, the system, the storage medium and the device based on the DMX512 protocol realize the out-of-band communication of the auxiliary data based on the physical layer of the DMX512 main data link, so that the auxiliary data frame can be transmitted through an out-of-band virtual channel completely compatible with the DMX512-A main data link, the communication quality is stable, no extra cost exists, and the device has high practicability.
The transmission timing diagram of the DMX512 data is shown in fig. 1. Where 1 denotes a transmission pause, 2 denotes a pause end flag, 3 denotes a field, 4 denotes a start bit, 5 denotes the lowest data bit, 6 denotes the highest data bit, 7 denotes a stop bit, 8 denotes a stop bit, 9 denotes an occupation between fields, 10 denotes an occupation before a transmission pause, 11 denotes a time between transmission pauses, 12 denotes a transmission reset sequence, 13 denotes a DMX512 packet, 14 denotes a start code (field 0 data), 15 denotes field 1 data, 16 denotes field n data (maximum 512). Therefore, the fields of the DMX512 data include a start code field (0 x 00) and subsequent data fields, which are sequentially numbered as W0, W1. Each field consists of start bit 0, 8 data bits, and 2 stop bits 1 in turn, for a total of 11 bits (_ xxxxxxxx ^). The duration of each bit is 4 microseconds.
As shown in fig. 2, in an embodiment, the method for out-of-band communication based on DMX512 protocol of the present invention includes the following steps:
and S1, constructing a logical relation between the field interval bit length and the bit information of the DMX512 main data.
Specifically, two adjacent fields of the DMX512 main data have a field interval between them. The bit length of the field interval is used by the present invention to indicate the bit information of the DMX512 auxiliary data. The number of fields of the DMX512 main data is at most 512, and may be less than 512. Preferably, the present invention fixes the number of fields of DMX512 master data to 512. When the number of fields is less than 512, the 512 fields are complemented with 0 value fields.
The data expression of the auxiliary data frame Daux is set to B [ N ], i.e., data representing a total bit length of N. Preferably, N takes the value 512. The data bits Bj for the auxiliary data frame Daux are represented by the bit length of the field interval. Uj is set as the field interval between the fields Wj-Wj +1, i.e. the number of free bits between the second stop bit of Wj and the start bit of Wj + 1. The bit information of the auxiliary data can be obtained by any logic of:
(1) When Uj is more than or equal to Uc, the value of Bj is 1; when Uj is less than Uc, the value of the Bj bit is 0. For example, if the bus bit information is _ xxxxxxxx ^ indicates Uj =0 < Uc, then Bj takes a value of 0; when the bus bit information is _ xxxxxxxx ^ a, which indicates Uj =2 > Uc, then Bj takes a value of 1.
(2) When Uj is more than or equal to Uc, the value of Bj is 0; when Uj is less than Uc, the value of Bj is 1. For example, if the bus bit information is _ xxxxxxxx ^ indicates Uj =0 < Uc, then Bj takes a value of 1; when the bus bit information is _ xxxxxxxx ^ xxxxxx ^ a, indicating Uj =2 > Uc, then Bj takes a value of 0.
Preferably, uc is 1, corresponding to 4 microseconds. Therefore, based on the field interval between all the fields W0-W512 of the DMX512 main data, at most 512 bits of information can be sequentially expressed, i.e., 512 bits of auxiliary data are expressed.
And S2, sequentially indicating each bit information of the DMX512 auxiliary data by the bit length of each field interval based on the logic relation so as to realize the out-of-band communication of the DMX512 auxiliary data during the transmission of the DMX512 main data.
Specifically, when the out-of-band communication of the DMX512 auxiliary data needs to be realized along with the synchronization of the DMX512 main data, the bit length of each field interval sequentially indicates the bit information of the DMX512 auxiliary data according to the constructed logical relationship. That is, the bit information corresponding to the bit length of each field interval is sequentially connected, i.e., the DMX512 auxiliary data is obtained.
To further ensure the validity of the transmitted DMX512 auxiliary data, in an embodiment of the present invention, the auxiliary data includes auxiliary information and check information. Specifically, the last bits of DMX512 auxiliary data B [ N ] are taken as frame check information. Preferably, the check information is cyclic redundancy check data of the DMX512 auxiliary data. For example, for 512-bit DMX512 auxiliary data, the first 60 bytes are used to transmit the auxiliary data, and the last 4 bytes hold the first 60 bytes of Cyclic Redundancy Check (CRC) data calculated by the sender. When the data receiving side performs cyclic redundancy check on the first 60 bytes received to obtain cyclic redundancy check data which is equal to the transmission value of the last 4 bytes, the DMX512 auxiliary data which is currently transmitted is indicated to be valid.
In an embodiment of the present invention, the DMX512 protocol-based out-of-band communication method further includes determining, based on the frame check, that the data indicated by the bit length of the field interval is invalid if the DMX512 data sent by the device that does not support the DMX512 protocol-based out-of-band communication is received. Therefore, the out-of-band communication method based on the DMX512 protocol is only suitable for application scenarios that both the sender and the receiver support the out-of-band communication based on the DMX512 protocol. If the device supporting the out-of-band communication based on the DMX512 protocol transmits the DMX512 data carrying the auxiliary data to the device not supporting the out-of-band communication based on the DMX512 protocol, the receiving device normally processes the received DMX512 main data, and does not pay attention to the change of the field interval.
In addition, it is calculated that the upper limit of the conventional application frame rate of the DMX512 protocol is about 44HZ, and after the out-of-band communication support of the present invention is added, the upper limit of the frame rate is about 40HZ. The frame rate of the actual DMX512 protocol application is usually about 30HZ, so that the real-time performance of the control system can be ensured, and the control and the stability of the original DMX512 data frame rate are not influenced by the out-of-band communication method based on the DMX512 protocol.
As shown in fig. 3, in an embodiment of the present invention, the out-of-band communication system based on DMX512 protocol of the present invention includes a construction module 31 and a communication module 32.
The building module 31 is configured to build a logical relationship between the field interval bit length and the bit information of the DMX512 main data.
The communication module 32 is connected to the building module 31, and configured to sequentially indicate, based on the logical relationship, each bit information of the DMX512 auxiliary data by the bit length of each field interval, so as to implement out-of-band communication of the DMX512 auxiliary data when the DMX512 main data is transmitted.
The structures and principles of the building module 31 and the communication module 32 correspond to the steps in the above-mentioned out-of-band communication method based on the DMX512 protocol, and therefore are not described herein again.
It should be noted that the division of each module of the above apparatus is only a logical division, and all or part of the actual implementation may be integrated into one physical entity or may be physically separated. And the modules can be realized in a form that all software is called by the processing element, or in a form that all the modules are realized in a form that all the modules are called by the processing element, or in a form that part of the modules are called by the hardware. For example: the x module can be a separately established processing element, and can also be integrated in a certain chip of the above device. In addition, the x-module may be stored in the memory of the apparatus in the form of program codes, and may be called by a certain processing element of the apparatus to execute the functions of the x-module. Other modules are implemented similarly. All or part of the modules can be integrated together or can be independently realized. The processing element described herein may be an integrated circuit having signal processing capabilities. In implementation, each step of the above method or each module above may be implemented by an integrated logic circuit of hardware in a processor element or an instruction in the form of software. These above modules may be one or more integrated circuits configured to implement the above methods, such as: one or more Application Specific Integrated Circuits (ASICs), one or more microprocessors (DSPs), one or more Field Programmable Gate Arrays (FPGAs), and the like. When a module is implemented in the form of a Processing element scheduler code, the Processing element may be a general-purpose processor, such as a Central Processing Unit (CPU) or other processor capable of calling program code. These modules may be integrated together and implemented in the form of a System-on-a-chip (SOC).
The storage medium of the present invention has stored thereon a computer program which, when executed by a processor, implements the above-described out-of-band communication method based on the DMX512 protocol. The storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic disk, U-disk, memory card, or optical disk.
As shown in fig. 4, in an embodiment, the out-of-band communication apparatus based on DMX512 protocol of the present invention includes: a processor 41 and a memory 42.
The memory 42 is used for storing computer programs.
The memory 42 includes: various media that can store program codes, such as ROM, RAM, magnetic disk, U-disk, memory card, or optical disk.
The processor 41 is connected to the memory 42 and configured to execute the computer program stored in the memory 42, so as to enable the DMX512 protocol based out-of-band communication apparatus to execute the above DMX512 protocol based out-of-band communication method.
Preferably, the processor 41 may be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), and the like; the integrated circuit may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic device, or discrete hardware components.
In summary, the method, system, storage medium, and apparatus for out-of-band communication based on DMX512 protocol of the present invention implement out-of-band communication of auxiliary data based on the physical layer of the DMX512 main data link, without additional cost; the implementation of out-of-band communication is transparent to the DMX512 protocol layer, so that the compatibility problem is avoided, and the stability of the communication quality is ensured; the auxiliary data is coded in the DMX data frame transmission process, and the control and the stability of the original data frame rate are not influenced. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (10)
1. An out-of-band communication method based on DMX512 protocol is characterized in that: the method comprises the following steps:
constructing a logical relation between the field interval bit length and the bit information of the DMX512 main data;
based on the logical relationship, sequentially indicating the bit length of each field interval to each bit information of the DMX512 auxiliary data, so as to realize the out-of-band communication of the DMX512 auxiliary data when the DMX512 main data is transmitted;
the method implements out-of-band communication of secondary data based on the physical layer of the DMX512 primary data link.
2. The DMX512 protocol based out-of-band communication method of claim 1, wherein: the auxiliary data includes auxiliary information and check information.
3. The DMX512 protocol based out-of-band communication method of claim 2, wherein: the check information is cyclic redundancy check data of the DMX512 auxiliary data.
4. The DMX512 protocol based out-of-band communication method of claim 1, wherein: the number of the fields of the DMX512 main data is not less than 512.
5. The DMX512 protocol based out-of-band communication method of claim 1, wherein: the logic relation is as follows: when the bit length of the field interval is greater than or equal to a preset bit length, the bit information of the DMX512 auxiliary data is a first numerical value; and when the bit length of the field interval is less than the preset bit length, the bit information of the DMX512 auxiliary data is a second numerical value.
6. The DMX512 protocol based out-of-band communication method of claim 5, wherein: the preset bit length is 1; the first and second values are 0 and 1 or 1 and 0.
7. The DMX512 protocol based out-of-band communication method of claim 1, wherein: if the DMX512 data sent by the device which does not support the out-of-band communication based on the DMX512 protocol is received, the data indicated by the bit length of the field interval is judged to be invalid based on the frame check.
8. An out-of-band communication system based on the DMX512 protocol, characterized in that: the system comprises a construction module and a communication module;
the construction module is used for constructing the logical relation between the field interval bit length and the bit information of the DMX512 main data;
the communication module is used for sequentially indicating each bit information of the DMX512 auxiliary data by the bit length of each field interval based on the logical relationship so as to realize the out-of-band communication of the DMX512 auxiliary data when the DMX512 main data is transmitted;
the system described implements out-of-band communication of auxiliary data based on the physical layer of the DMX512 primary data link.
9. A storage medium on which a computer program is stored which, when being executed by a processor, carries out the DMX512 protocol-based out-of-band communication method of any one of claims 1 to 7.
10. An out-of-band communication apparatus based on the DMX512 protocol, comprising: a processor and a memory;
the memory is used for storing a computer program;
the processor is configured to execute the computer program stored in the memory to cause the apparatus for out-of-band communication based on DMX512 protocol to perform the method for out-of-band communication based on DMX512 protocol of any one of claims 1 to 7.
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