CN101789978B - DMX512 data receivers and method thereof for automatic addressing in network - Google Patents

Abstract

A method for automatically addressing a data receiver and a data receiver in a control data network established based on the DMX512 protocol. The control data network includes a DMX512 data control/encoder and no more than 512 DMX512 data receivers. The DMX512 data receiver is networked in series. The data receiver first decodes the received frame data and reads the respective control bytes of the first k control data bytes, and then re-encodes the frame data for output after deleting the first k control data bytes in the frame data . Under the condition of being compatible with the general DMX512 data control/encoder, the present invention realizes the automatic addressing of the data receiver, and the transmission distance is not limited, which makes the networking and later maintenance convenient, and makes the control data network more efficient. Sophisticated regulation of data transmission distribution capabilities.

Description

DMX512 data receiver and its automatic addressing method in network

technical field

The invention relates to a method and a device for allocating network addresses in a network, in particular to a method for allocating network addresses for a data receiving device in a network established based on a data transmission protocol and a device for the method.

Background technique

The DMX512 protocol is an international standard digital dimming communication protocol Digital Dimmer Protocol, proposed by the United State Institute for Theater Technology, Inc., originally used for stage lighting control. It can transmit 512 channels on a pair of lines. Standard for silicon controlled brightness information. In the network formed by the control/encoder and no more than 512 data receivers, the control/encoder encodes the control data according to the DMX512 protocol and outputs it to the above-mentioned network, and each data receiver receives its own control data, The control data is used to adjust the brightness of the lamps; now the application field of the network has been continuously expanded to the field of coordinated control of multiple or multiple devices, for example, for the water pressure control of each nozzle in a multi-nozzle fountain, for Brightness or color control of LED display.

In the network established based on the DMX512 protocol, the control data adopts an asynchronous communication method, and the data transmission rate is 250 kilobits/second. As shown in Figure 4, each frame based on the data of the DMX512 protocol includes a synchronization header D _H and 512 regulation data bytes D, and the regulation data bytes D include a section start bit _BF , a regulation byte BD _and a section end bit B _E . Taking the traditional light brightness adjustment as an example, the data receiver reads the control byte B _D of the control data at the corresponding position from each frame of data according to the address assigned to it by the network, and the information transmitted by the control byte B _D It is the brightness value of the light. Then, assigning addresses to each data receiver is an important part to ensure that the control data is transmitted accurately.

The prior art mainly has the following three methods to solve the addressing problem of the data receiver:

First, manual addressing. A dual in-line package switch (Dual In-line Package Switches, DIP switch for short) is set on each data receiver. By manually toggling the DIP switch, an address code is set for each data receiver, and the single-chip microcomputer in the data receiver determines the position in the frame data of the control data byte D that it should receive according to the address code, Thus, the regulation byte B _D is accurately received. The disadvantage of this method is that the manual setting of the DIP switch requires a lot of work, and problems such as missed, over-dial, or wrong-dial are prone to occur, which increases the cost of debugging, and also brings great hidden dangers to the later maintenance process.

Second, SPI shifts data synchronously, and said SPI is the abbreviation of Serial Peripheral Interface. Set the synchronous clock port and data latch enable port on the general control/encoder and data receiver, and add transmission lines for transmitting synchronous clock signal and data latch enable signal respectively, all data receivers serially group net. Under the synchronous effect of the synchronous clock signal, the frame data is sequentially shifted, and when the regulation data byte is moved to match with the corresponding data receiver, a data latch enable signal is sent, and each data receiver latches The respective control data bytes complete the corresponding addressing and receiving data. The defect of this method is, described network can not be compatible with common DMX512 control/encoder, needs to refit general DMX512 control/encoder; Also will increase transmission line simultaneously, increases from original 3 transmission lines to 5 transmission lines, For applications with long transmission distances, the RS485 interface is used, and the number of transmission lines is increased from the original 4 to 8. For actual networking, too many transmission lines are unacceptable.

Third, use a dedicated control/encoder and receiver. This method is generally no longer fully compatible with the standard DMX512 protocol, only compatible with supporting the DMX512 protocol in the data transmission part, and adding a test or training operation mode before data transmission for writing addresses to each data receiver. The above method also often requires the data receiver to respond, so it also adds a small connection line or two. The defect of this method is that the control/encoder and the data receiver used in the method are all supporting designs, and have special functions, and cannot be matched by the general DMX512 control/encoder of the prior art. It is extremely unfavorable in terms of application and promotion, and the scope of application is small; moreover, the number of connecting wires will increase in different ways, the networking method is also relatively complicated, and the control/encoder operation is also different and complicated.

The above methods all have their own defects, and for LED lamps, each lamp needs to occupy more than one address, such as the control of the red, green and blue lights of the lamp. A method for receivers to occupy multiple addresses. Therefore, there is a need for a method that is compatible with various networks based on the DMX512 protocol and allows the data receiver to automatically address.

Contents of the invention

The technical problem to be solved by the present invention is to avoid the deficiencies of the prior art and to propose a method for automatically addressing a data receiver and a data receiver for the method in a control data network compatible with a general DMX512 control/encoder .

The present invention solves described technical problem and can realize by adopting following technical scheme:

Implement a method for automatically addressing data receivers in a control data network based on the DMX512 protocol. The control data network includes a DMX512 data control/encoder and n DMX512 data receivers, n≤512, and the DMX512 data The data output port of the control/encoder is electrically connected to the data input port of a DMX512 data receiver, and the DMX512 data receiver is connected in series according to its own output port to the input port of the next DMX512 data receiver; In particular, each DMX512 data receiver receives each frame of data as follows:

A. Receive frame data from the data input port;

B. Decoding the frame data according to the DMX512 protocol;

C. according to the reception control byte amount k set by the DMX512 data receiver itself, read the respective control bytes of the first k groups of control data bytes in the frame data processed through step B, k≤n;

D. deleting the first k groups of control data bytes in the frame data processed through step C;

E. the frame data processed through step D is encoded according to the DMX512 protocol;

F. Output the frame data processed in step E from the data output port.

The present invention solves described technical problem and can realize by adopting following technical scheme:

Design and manufacture a data receiver based on the DMX512 protocol, including a power input port, a ground port, a data input port, and a data output port, especially, also including a control device electrically connected between the data input port and the data output port Data receiving module; The frame data receiving module first decodes the received frame data and reads the respective regulating bytes of the first k regulating data bytes, and then deletes the preceding k regulating data bytes in the frame data to The frame data is re-encoded and output, wherein k is the number of receiving control bytes set by the data receiver, and the decoding and encoding are all processing the frame data according to the DMX512 protocol.

The control data receiving module is a single chip microcomputer, or a digital logic circuit.

Compared with the prior art, the technical effects of the present invention "DMX512 data receiver and its automatic addressing method in the network" are:

1. There is no need to make any special design for the DMX512 data control/encoder. Each DMX512 data receiver can be connected to any position in the control data network, and the addressing of the data receiver can be realized to make the network work simple and easy;

2. In terms of data transmission, each DMX512 data receiver is equivalent to a data relay, and the data transmission is not limited by the distance. The structure of the control data network is simple;

3. Since each DMX512 data receiver receives the regulation data bytes in the same way, the data receivers in the regulation data network are the same, making the maintenance of the regulation data network easier;

4. The DMX512 data receiver can receive k groups of control data bytes, which is equivalent to a data receiver that can receive control data bytes of k addresses, so that the control data network has more complex control data transmission and distribution capabilities .

Description of drawings

Fig. 1 is the electrical principle block diagram of the DMX512 data receiver 200 of the present invention " DMX512 data receiver and the method for its automatic addressing in network " preferred embodiment;

Fig. 2 is the networking schematic diagram of the DMX512 data control network of the preferred embodiment of the present invention;

Fig. 3 is the workflow schematic diagram of the control data receiving module 210 of DMX512 data receiver 200 described in the preferred embodiment of the present invention;

Fig. 4 is a schematic diagram of the data structure of a frame based on the DMX512 protocol.

Detailed ways

Further details will be given below in conjunction with the preferred embodiments shown in the accompanying drawings.

The present invention relates to a method for automatically addressing data receivers in a control data network based on the DMX512 protocol. As shown in Figures 1 and 2, the control data network 300 includes a DMX512 data control/encoder 100 and n DMX512 data receiver 200, n≤512, the data output port ID of described DMX512 data control/encoder ₁₀₀ is electrically connected with the data input port I of a DMX512 data receiver, and described DMX512 data receiver is according to its output port O is electrically connected to the input port 1 of the next DMX512 data receiver to connect to the network in series, especially, each DMX512 data receiver 200 receives each frame of data according to the following steps:

A. Receive frame data from data input port I;

B. Decoding the frame data according to the DMX512 protocol;

C. according to the reception control byte amount k set by the DMX512 data receiver itself, read the respective control bytes of the first k groups of control data bytes in the frame data processed through step B, k≤n;

D. deleting the first k groups of control data bytes in the frame data processed through step C;

E. the frame data processed through step D is encoded according to the DMX512 protocol;

F. Output the frame data processed in step E from the data output port O.

As shown in Figure 2, the DMX512 data receiver 200 serial networking mode has allocated a physical address for each data receiver 200, and each DMX512 data receiver 200 has received a physical address corresponding to itself according to steps A to F. K groups of control data bytes corresponding to the address. When k=1, the physical address corresponds to the allocation address of the control data byte; when k>1, each DMX512 data receiver 200 occupies the allocation address of k control data bytes, and this situation is applicable to some For special applications, for example, the control data network based on the DMX512 protocol is used for the control of LED lamp groups, and each of the LED lamps includes three LED illuminants that emit red, green and blue light respectively, Then, it is necessary to allocate dimming data bytes to the three LED illuminants in the LED lamp respectively. In this case, the number of receiving regulating bytes set in the DMX512 data receiver 200 is k=3.

As mentioned above, the DMX512 data receiver 200 not only completes the reception of the regulation byte, but also re-encodes the frame data, removes the regulation byte read by itself, so that the next DMX512 data receiver 200 needs to receive the regulation byte The section is placed at the head of the frame data, and the new frame data is re-encoded. The DMX512 data receiver 200 also functions as a data relay, enabling it to transmit data over long distances.

As shown in Figure 1, the present invention also relates to a data receiver 200 based on the DMX512 protocol, including a power input port V _CC , a ground port GND, a data input port I and a data output port O, especially, also includes an electrical connection at The control data receiving module 210 between the data input port I and the data output port O. The control data receiving module 210 first decodes the received frame data and reads the respective control bytes of the first k control data bytes, and then re-deletes the frame data after deleting the first k control data bytes in the frame data. Coding output, wherein k is the number of receiving control bytes set by the data receiver, and the decoding and coding are all processing the frame data according to the DMX512 protocol. In addition, when used for long-distance transmission, the data input port I and the data output port O can use RS485 interfaces.

The control data receiving module 210 is a single chip microcomputer, or a digital logic circuit. In order to save hardware costs, in a preferred embodiment of the present invention, the control data receiving module 210 adopts a single-chip microcomputer, and the flow chart of receiving data processing of the single-chip microcomputer is shown in FIG. 3 .

Claims (3)

1. one kind makes the method for data sink auto-addressing in the regulation and control data network of setting up based on DMX512 agreement, described regulation and control data network comprises DMX512 Data Control/encoder and n DMX512 data sink, n≤512, the data-out port of described DMX512 Data Control/encoder is electrically connected with the data-in port of a DMX512 data sink, and the mode that described DMX512 data sink is electrically connected the input port of next DMX512 data sink according to the output port of self is connected in series networking; It is characterized in that:

Described each DMX512 data sink receives every frame data as follows:

A. from data-in port frames received certificate;

B. according to DMX512 agreement, described frame data are decoded;

C. the reception regulation and control amount of bytes k setting according to described DMX512 data sink self, reads respectively front k group regulation and control data byte regulation and control byte separately in the described frame data of processing through step B, k≤n;

D. the front k group regulation and control data byte in the described frame data of processing through step C is deleted;

E. the described frame data of process step D being processed are according to DMX512 protocol code;

F. will process described frame data through step e exports from data-out port.

2. the data sink based on DMX512 agreement, comprises power input mouth, grounding ports, data-in port and data-out port, it is characterized in that:

Also comprise the regulation and control data reception module being connected electrically between described data-in port and data-out port;

First described regulation and control data reception module is decoded the frame data of receiving and is read front k regulation and control data byte regulation and control byte separately, then after the regulation and control of front k in delete frame data data byte, frame data recompile is exported, wherein k is the reception regulation and control byte number that described data sink is set, and described decoding and coding are all, according to DMX512 agreement, frame data are carried out to processing procedure.

3. the data sink based on DMX512 agreement according to claim 2, is characterized in that:

Described regulation and control data reception module is single-chip microcomputer, or Digital Logical Circuits.

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