CN104104748A

CN104104748A - DMX512 protocol based LED (Light Emitting Diode) lamp address writing method

Info

Publication number: CN104104748A
Application number: CN201410363319.0A
Authority: CN
Inventors: 王挺
Original assignee: Sichuan Jiuzhou Optoelectronics Technology Co Ltd
Current assignee: Sichuan Jiuzhou Optoelectronics Technology Co Ltd
Priority date: 2014-07-28
Filing date: 2014-07-28
Publication date: 2014-10-15

Abstract

The invention discloses a DMX512 protocol based LED (Light Emitting Diode) lamp address writing method. The DMX512 protocol based LED lamp address writing method comprises step 1, performing address-free installation when LED lamps are arranged on a 485 bus; step 2, sending the address information of the LED lamps to the LED lamps from a controller through address lines respectively after the LED lamps are installed; step 3, reserving and burning a first address code of the address information in an MCU (Micro Controller Unit) of the first LED lamp after the first LED lamp receives the address information sent from the controller, sending rest of a second to an nth address code to MCUs of the next LED lamps respectively and sending the corresponding address code to the nth LED lamp in turn. According to the DMX512 protocol based LED lamp address writing method, addresses of products on one bus can be written at one time and the address writing does not need to be performed on every product separately.

Description

LED light fixture write address method based on DMX512 agreement

Technical field

The present invention relates to a kind of LED light fixture write address method, be specifically related to a kind of LED light fixture write address method based on DMX512 agreement.

Background technology

DMX512 agreement is to be developed into from the mode of control desk standard digital interface control dimmer by USITT (theater technological associations of the U.S.) at first.DMX512 is around industrial standard EIA-485 Interface design.EIA-485 belongs to " electricity " end of interface, voltage, electric current etc.

System is that the downward symmetry based on along shielded conductor twisted-pair feeder sends and sets up.This winding arrangement guarantees that produced interference can similarly act on two signals, has therefore ensured consistent digital phasing.Wire used should be by one or two suitable data conductor that twisted-pair feeder, paillon foil and wire gauze sieve form.Symmetrical audio wire can not complete this work.

Normally, just, as any network segment, should there be two terminals at wire two.Light control console conventionally at one as terminal, and other end should only have the resistance of 120 Ω.EIA485 specification is only supported the serial network forming mainly with 32 " unit loads " on " daisy chain " or every section.

MCU (Micro Control Unit) Chinese is micro-control unit, claim again one chip microcomputer (Single Chip Microcomputer) or single-chip microcomputer, refer to appearance and development thereof along with large scale integrated circuit, by the CPU of computer, RAM, ROM, timer conter and multiple I/O Interface integration on a slice chip, form the computer of chip-scale, for doing various combination control in different application scenarios.

Now in LED brightening, heavy-power LED product is more and more, and in heavy-power LED product, use having accounted for more than 90% of DMX512 agreement, what DMX512 agreement was used is 485 bus modes, it is each product in 485 buses, and this just need to solve the problem of a write address, each product is write an address, now the method for main flow be one by one product separately by 485 bus write addresses, write another one of address installs to appointment place by address, cause like this difficulty of construction large, the time is long.Require communication distance be tens meters on when km, extensively adopt RS-485 serial bus standard.RS-485 adopts balance to send and differential received, therefore has the ability that suppresses common mode disturbances.Signal transmission adds that bus transceiver has high sensitivity, can detect the voltage that is low to moderate 200mV, therefore can be restored beyond km.RS-485 adopts half-duplex operation, whenever can only have any in transmission state, and therefore, transtation mission circuit must be controlled by enable signal.Very convenient when RS-485 is used for multi-point interconnection, can save many holding wires.The application RS-485 formation distributed system of can networking.The method also having is that bus is disconnected one by one, and then online light fixture is carried out to write address, and first lamp passes through the bus between relay closes first and second by the MCU of first lamp after having write.This whole system will cause a lot of joints in bus, has increased the impedance of bus, has also reduced the stability of bus signals.

Summary of the invention

The present invention has overcome the deficiencies in the prior art, provides one can once write all addresses, need not be separately the LED light fixture write address method based on DMX512 agreement of each product write address again.

For solving above-mentioned technical problem, the present invention by the following technical solutions:

A LED light fixture write address method based on DMX512 agreement, described write address method comprises the following steps:

While installation in step 1, LED light fixture and 485 buses, adopt not sub address to install;

After step 2, described LED lamp installation complete, the address information of LED light fixture is sent on LED light fixture by address wire by controller;

Step 3, when first LED light fixture receive controller send address information after, first address code of address information is retained to the also MCU of burned LED light fixture, and remaining second to n address code is sent to the MCU of next LED light fixture, send to successively n LED light fixture.

Further technical scheme is that write address method also comprises step: when n address code sends and after burning completes, address wire removed.

Further technical scheme is that write address method also comprises step: when n address code sends and after burning completes, address wire adopted to shielding conductor.

Compared with prior art, the invention has the beneficial effects as follows: the present invention is based on all products that the LED light fixture write address method of DMX512 agreement realizes in a bus and can once write all addresses, need not be separately each product write address again.

Brief description of the drawings

Fig. 1 is LED lamp circuit connection layout in one embodiment of the invention.

Embodiment

Below in conjunction with accompanying drawing, the present invention is further elaborated.

As shown in Figure 1, in one embodiment of the invention, LED light fixture is in the time that engineering site is installed, sub address is not installed, connecting circuit figure is as Fig. 1, bus 485A is connected respectively LED light fixture 1, LED light fixture 2 with bus 485B, one until 485 chips of LED light fixture n, and wherein n is constant, for representing to be greater than a constant value of 2.485 chips connect the MCU of LED light fixture, and bus shielding conductor connects the MCU of LED light fixture simultaneously, and the MCU of LED light fixture connects LED and drives.MUC in each LED light fixture connects successively.As preferred embodiment, in the present embodiment, the concrete write address step of LED light fixture is as follows: while installation in 1.LED light fixture and 485 buses, adopt not sub address to install;

2., after described in, LED lamp installation completes, the address information of LED light fixture is sent on LED light fixture by address wire by controller;

3. when first LED light fixture receives after the address information of controller transmission, first address code of address information is retained to the also MCU of burned LED light fixture, and remaining second to n address code is sent to the MCU of next LED light fixture, send to successively n LED light fixture.Preferably, after address transmission burning complete, each light fixture address has been kept in the MCU of light fixture, and address wire is dismountable, or address wire adopts the screen of holding wire.After burning address completes, address wire just can play lightning protection, anti-tampering.All LED light fixture products in bus of the present embodiment can once write all addresses, need not be separately each product write address again.

" embodiment ", " another embodiment ", " embodiment " that spoken of in this manual, etc., refer to specific features, structure or the feature described in conjunction with this embodiment and be included at least one embodiment that the application's generality describes.In specification, multiple local appearance statement of the same race is not necessarily to refer to same embodiment.Furthermore, while describing a specific features, structure or feature in conjunction with any embodiment, what advocate is to realize this feature, structure or feature in conjunction with other embodiment also to fall within the scope of the invention.

Although with reference to the multiple explanatory embodiment inventing, invention has been described here, but, should be appreciated that, those skilled in the art can design a lot of other amendment and execution modes, within these amendments and execution mode will drop on the disclosed principle scope and spirit of the application.More particularly, in the scope of the open claim of the application, can carry out multiple modification and improvement to the building block of subject combination layout and/or layout.Except modification that building block and/or layout are carried out with improving, to those skilled in the art, other purposes will be also obvious.

Claims

1. the LED light fixture write address method based on DMX512 agreement, is characterized in that: described write address method comprises the following steps:

2. the LED light fixture write address method based on DMX512 agreement according to claim 1, is characterized in that described write address method also comprises step: when n address code sends and after burning completes, address wire removed.

3. the LED light fixture write address method based on DMX512 agreement according to claim 1, is characterized in that described write address method also comprises step: when n address code sends and after burning completes, address wire adopted to shielding conductor.