KR20110003077A - Automatic address allocation method for light source module - Google Patents

Abstract

PURPOSE: An automatic address allocation method for a light source module is provided to enable a user not to use an additional signal line and a chip when automatically allocating an address to each light source module. CONSTITUTION: A light source module scans and stores address data from an address allocation data(S820), and a CPU of the light source module enables an output RS-485 chip of the light source module(S830). If the CPU is not in an automatic address allocation mode, the CPU judges whether or not a counter value of the address allocation data is below a certain value(S840). If the counter value is below the certain value, the CPU ignores the received data(S850). If the counter value is over the certain value, the CPU switches the current mode into a DMX data reception mode(S860).

Description

Automatic Address Allocation Method for Light Source Module

The present invention relates to a light source console and a light source dimming module using the DMX-512 standard, and more particularly, to a method for automatically assigning addresses to a plurality of light source dimming modules.

The DMX-512 is a standard for connecting light source dimming modules to light consoles designed by the American Stage Technology Association. 1 is a schematic diagram illustrating a connection between a light source dimming module 12 and 14 and a light source console 10 using a DMX-512. Many light source-related devices support or use the DMX-512. The DMX-512 supports 512 channels per link, and these channels contain data that controls the light brightness of the dimming terminals. Each dimming terminal receives 8 bits of data with a value between 0 and 255 through the data link. Data is transmitted over two wires at 250,000 bits per second using the RS-485 transmission interface.

2 is a block diagram illustrating a link structure of a DMX-512 method using an RS-485 chip. 2, in the DMX-512 method, a data transmission module is connected to an input of the first dimmer module 20, and an output of the first dimmer module 20 is connected to an input of the second dimmer module 22. In this way, the last dimming module 24 is connected, which is called a daisy chain method. In theory, the DMX-512 supports 512 dimming modules when the dimming module has only one channel, but only 32 dimming modules are supported when connected to one data link due to the limitations of the RS-485 chip. The reason is that the DMX-512 uses RS-485 and 32 loads are standard for the RS-485 standard EIA / TIA-485. Therefore, the dimmer module supporting only the DMX-512 standard connects up to 32 dimming modules according to the EIA / TIA-485 standard. However, if you use a chip that supports more than 32 loads, which is an improvement of the standard, you can extend the 32 limit to some extent.

The DMX-512 standard includes a reset status and start code to indicate the start of a new packet, and data transfer for 512 bytes. Data packets are sent continuously, and once a packet has been sent, it is possible to decide whether to send the next packet or delay. Generally, 1ms delay is allowed. The real data of the DMX-512, that is, the data code representing the brightness value of the dimming terminal, consists of start bit, data bit, and stop bit. The start and stop bits work to synchronize the light source console and the light control module. The signal of the dimmer module is usually kept high. The start bit of one bit changes to the low state, indicating the start of data. The dimmer module then scans the 8 bits of data and restores the signal back to a higher state with the next two bits of stop. The scanned data bits finally control the brightness of the dimming terminal.

The DMX-512 standard is simple and robust. But there are many problems. First, the DMX-512 is a powerful force where few channels are needed, but problems arise as the number increases. In the case of using a general 32-link RS-485, in order to use more than 32 light source dimming modules, as shown in FIG. 3, the DMX distributor 30 must be used. In addition, the limit distance of the RS-485 is a relatively long distance of about 1.2Km, but if you need to support a longer distance, as shown in Figure 4, the signal amplifier 40 must be installed.

Another problem with the DMX-512 standard is that it must be configured via a switch such as a dip switch in order to set the channel of each dimmer module. Each dimming module has a switch for designating its own channel. If one dimming module has one dimming terminal as shown in (a) of FIG. 5, the dimming module sets the channel through sequential switching. If the dimming module has one channel, 512 can be used. However, since the dimming module prefers to produce colorful colors using RGB rather than one color recently, the dimming module supports three colors rather than one channel. There are many dimming modules that support channels. In the case of the dimming module each having a dimming terminal having an RGB color, three channels should be set in one dimming module as shown in FIG. However, in the worst case, it is not only time-consuming to manually set the channels of the 512 dimming modules by hand, but if the wrong channel is installed by mistake, it is difficult to check until the final confirmation later.

Three improvements are needed to solve the problem of using the DMX-512 standard. First of all, the problem of RS-485 is to increase the number of module connections, loosen the distance limit, and improve the inconvenience of the dipswitch. However, because the DMX-512 has RS-485 as standard, this problem cannot be solved by the standard. Therefore, to solve this, it is necessary to modify the dimming module a little.

First, in order to solve the limitation of the distance and the number, a method as shown in FIG. 6 may be used. This is a method of separating the RS-485 bus input from the light source console and the RS-485 bus output to the next light source dimming module by mounting one more RS-485 chip on the light source dimming module (60, 61). When the input RS-485 chips 62 and 64 and the output RS-485 chips 63 and 65 are respectively used for the light source modules 60 and 61, the maximum number of RS-485 chips connected on the bus between the light source modules is 2 It becomes a dog. Therefore, even if infinite light source modules are connected, there is no problem in data transmission. 6, the RS-485 left chips 62 and 64 receive RS-485 data input to the light source modules 60 and 61, and the signal is transmitted to the CPU of the light source module. 66,67). Data transmitted to the CPU (66,67) is transmitted to the input of the right RS-485 chip (63,65), which is output to the RS-485 bus immediately after enabling the transmission control signal from the CPU (66,67). In this way, multiple light modules can be connected, as well as the bus length limitation of RS-485.

The problem of manually setting the dip switch can be solved by automatically assigning an address to each light control module. Already, various automatic address assignment techniques have been proposed. Most of automatic address assignment has a problem of using a separate signal line for assigning an address and a chip for processing a signal.

The present invention has been made in view of the above, and provides an automatic address assignment method for a light source dimming module that does not use a separate signal line and chip when automatically assigning an address to each light source dimming module in the DMX-512 standard. Has its purpose.

The present invention for achieving the above object, the light source console using the DMX-512 standard data relates to a method for automatically assigning an address to a plurality of light source dimming module connected in series thereof, the input of the predetermined light source dimming module RS-485 The chip receiving address assignment data from the light source console, determining whether the CPU of the predetermined light source dimming module is in the automatic address assignment mode, and in the automatic address assignment mode, the predetermined light source dimming module uses the address data from the address assignment data. Scan and store the CPU, and enable the CPU of the predetermined light source dimming module to enable its output RS-485 chip, when the CPU of the predetermined light source dimming module is not in the automatic address assignment mode. Determining whether the value is less than the predetermined value, ignoring the received data when the counter value is less than the predetermined value, and counting When the value is above a predetermined value, and a step to switch to the DMX data receive mode.

At this time, the light source console transmits address assignment data and sequentially assigns addresses of the light source dimming module, and the light source console transmits data by putting an address value in the first first address and a current counter value in the second. In turn, an address is assigned to every light control module. Then, the light source console transmits the next data by increasing 3 to the first address value and increasing the 1 to the second counter value.

In addition, the transmission and reception enable signal of the input RS-485 chip of the plurality of light source dimming module, the control signal is initially set to enable, and the transmission and reception enable of the output RS-485 chip of the plurality of light source dimming module It is preferable that all of the disable control signals are initially set to disable, and the transmission control signals of the CPUs of the plurality of light source dimming modules are initially set to disable.

In particular, the plurality of light source dimming modules are in a state where a dip switch is removed and is set to receive first, second, and third data of data transmitted from the light source console in an initial state when power is turned on. At this time, if the first counter value is 0 and the counter is incremented by 1, the predetermined value, which is the next counter value, becomes n after the automatic address allocation of all n light source dimming modules is completed.

As described above, according to the present invention, when the address is automatically assigned to each light source dimming module in the DMX-512 standard, a separate signal line and a chip are not used to reduce the inconvenience of switching and to limit the number of connecting devices. There is an effect that can overcome.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the following embodiments are provided to those skilled in the art to fully understand the present invention, and may be modified in various forms, and the scope of the present invention is limited to the embodiments described below. It doesn't happen.

7 is a schematic diagram illustrating a connection between a light source console and a light source dimming module in which an automatic address assignment method for a light source dimming module according to an exemplary embodiment of the present invention is performed.

In order to automatically assign an address to the light source dimming module using the DMX-512 standard data, a plurality of light source dimming modules 710, 720, and 730 connected in series with the light source console 700 are input RS-485 chips 711,721,731 and output RS, respectively. -485 chips 712,722,732, CPUs 713,723,733, and LEDs 717,724,734 connected to the CPUs 713,723,733.

In general, in the DMX-512 method, when 512 channel data is transmitted, the light source dimming modules 710, 720, and 730 each have a fixed address to scan their channel data. When each light source dimming module 710, 720, 730 has three channels, three channel data are obtained by scanning a start address among data received from the light source console 700. The important thing here is that each light source dimming module must receive and scan the assigned channel data. With the scanned DMX data, the CPUs 713, 723 and 733 of the light source dimming module 710, 720 and 730 are converted into PWM signals and transmitted to the LEDs 717, 724 and 734. Let's go. In this process, since data passes through the CPU, automatic address assignment according to the present invention is possible without using a separate signal line.

In the connection structure as shown in FIG. 7, all of the light source dimming modules 710, 720, and 730 are in a state where the dip switch is removed, and the address values should be programmed to 1 in the initial state when the power is turned on. This means that the first, second, and third data of the 512 data of the DMX transmitted from the light source console 700 are accepted as magnetic data. Therefore, since all light source dimming modules 710, 720, and 730 scan the first three channel data values among the 512 channel data, only the first three data may be used for automatically assigning an address.

In the connection structure as shown in FIG. 7, all of the transmit and receive enable-disable control signals of the input RS-485 chips 711, 721, and 731 of all the light source dimming modules 710, 720, and 730 are initially enabled, and the output RS-485 chips. The reception function of (712, 722, 732) is not necessary, so it is set to disable. When the transmit control signal of the CPU 713, 723, 733 is in an initial state, the data is transmitted to the second light source module 720 when the light source console 700 sends data to the first light source module 710 by disabling it. You can stop it.

In this condition, FIG. 8 is a flowchart illustrating an automatic address assignment method according to a preferred embodiment of the present invention.

First, the light source console 700 transmits address allocation data through the RS-485 bus by putting an address value in the first and a current counter value in the second of the 512 channel values. In this case, the second and subsequent data values have no meaning in the automatic address assignment mode, and the second and subsequent data values have meaning when the switch is made to the data reception mode after the automatic address assignment mode ends.

The first light source dimming module 710, which is first connected to the light source console 700, is input RS-485 chip 711 because the initial address is 1 as described above when the first power is input and in the automatic address assignment mode. The first three pieces of data are received (S800). Then, the CPU 713 of the first light source dimming module 710 receives this data to determine whether the automatic address allocation mode is performed (S810). In the automatic address allocation mode, the CPU 713 allocates the first value of the received data to its own address. Store in (S820). The second value of the received data is a counter value that checks whether the address allocation of all the light control modules is completed. The counter value increases by 1 and the final value depends on the number of light dimming modules.

When the address allocation of the first light source dimming module 710 is completed, the CPU 713 of the first light source dimming module 710 enables the transmission control signal of the output RS-485 chip 712 (S830). In this case, the next data sent from the light source console 700 may be transmitted to the light source dimming module 720 which is directly connected to the self and the self.

Next, the light source console 700 transmits the second data by increasing 3 to the current auto address value and increasing the counter value to 1. In this step, the first and second light source dimming modules receive data. The first light source dimming module 710 determines that the CPU 713 is not in the automatic address assignment mode because an address is already assigned. However, when the automatic address assignment of all other light source dimming modules is not finished, the counter value is less than the predetermined value, so that the CPU 713 of the first light source dimming module 710 receives the second data transmitted from the light source console 700. It is ignored (S850).

The second data transmitted from the light source console 700 is transmitted to the input RS-485 chip 721 of the second light source dimming module 720 through the output RS-485 chip 712 of the first light source dimming module 710. However, since the second light source dimming module 720 is not assigned an address, the CPU 723 recognizes the automatic address assignment mode, assigns this value to its own address, and stores the value in its own memory. Thereafter, the CPU 723 of the second light source dimming module 720 enables the transmission control signal of the output RS-485 chip 722.

When the automatic address allocation of all the light source dimming modules (n) is repeated by repeating the above method, the next counter value becomes a predetermined value, and the address allocation mode is terminated as a whole. If the first counter value is 0, after the automatic address allocation of all the light source dimming modules (n) is completed, the next predetermined counter value is n. The CPU of all the dimmer modules receiving the counter data is converted from the address assignment mode to the DMX-512 data reception mode (S860).

1 is a schematic diagram showing a connection between a light source dimming module and a light source console using a DMX-512;

2 is a block diagram illustrating a link structure of a DMX-512 method using an RS-485 chip;

3 is a block diagram illustrating an example of using a DMX distributor to use more than 32 light source dimming modules when using RS-485 with 32-link support.

4 is a block diagram illustrating an example of using a signal amplifier to overcome the limit distance when using RS-485,

5 is a schematic diagram illustrating a dip switch structure when one channel and three channels of a light source dimming module are provided;

6 is a block diagram illustrating the configuration of a light source dimming module in connection between a light source console and a light source dimming module using the DMX-512 standard;

7 is a block diagram illustrating a connection between a light source console and a light source dimming module in which an automatic address assignment method for a light source dimming module according to an exemplary embodiment of the present invention is performed;

8 is a flowchart illustrating an automatic address assignment method according to a preferred embodiment of the present invention.

Claims (8)

In the method that the light source console using the DMX-512 standard data automatically assigns an address to a plurality of light source dimming modules connected in series. Receiving, by an input RS-485 chip of a predetermined light source dimming module, address assignment data from the light source console; Determining whether the CPU of the predetermined light source dimming module is in an automatic address assignment mode; In the automatic address assignment mode, the predetermined light source dimming module scans and stores address data from address allocation data, and enables the CPU of the predetermined light source dimming module to enable its output RS-485 chip; Determining whether the counter value of the received address allocation data is less than a predetermined value by the CPU of the predetermined light source dimming module when the automatic address allocation mode is not in the automatic address assignment mode; And disregarding the received data when the counter value is less than the predetermined value, and switching to the DMX data receiving mode when the counter value is greater than or equal to the predetermined value. The method of claim 1, The light source console transmits address assignment data to sequentially assign the address of the light source dimming module, and the light source console transmits the data by putting an address value in the first first address and a current counter value in the second. Automatic address assignment method for a light source dimming module, characterized in that the address is assigned to all light source dimming module in turn. 3. The method of claim 2, wherein the light source console transmits the next data by increasing 3 to a current first address value and increasing a 1 to a second counter value. 2. The method of claim 1, wherein both the transmit and receive enable-disable control signals of the input RS-485 chips of the plurality of light source dimming modules are initially set to enable. The method of claim 1, wherein all of the transmit / receive enable-disable control signals of the output RS-485 chips of the plurality of light source dimming modules are initially set to disable. The method of claim 1, wherein the transmission control signals of the CPUs of the plurality of light source dimming modules are initially set to disable. The light source dimming module of claim 1, wherein the plurality of light source dimming modules are in a state where a dip switch is removed and is configured to receive first, second, and third data among data transmitted from the light source console in an initial state when power is turned on. Automatic address assignment method for light control module. The light source dimming module according to claim 1, wherein if the first counter value is 0 and the counter is incremented by one, the predetermined value, which is the next counter value, after the automatic address allocation of all n light source dimming modules is completed is n. Automatic address assignment method for.

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