Light control signal term

Light control signal class 1, analog control signal It is a kind of signal that uses the low voltage signal to control the lamp or the silicon box directly. Now generally 0 ~ 10V voltage signal is used as an analog control signal. It is usually used in the control of stage dimming, speed regulation, and some simple effects lamps. Its advantage is that the signal generation, acceptance and processing are relatively simple. No need to add any processing equipment, intuitive use, maintenance is also relatively easy. Especially in the dimming control, the analog control signal can easily achieve stepless dimming. In some important places, due to reliability considerations, some computer lamps generally use analog signal control because they need special personnel to control. Its disadvantages are: the transmission of signals is troublesome, and each circuit must have a separate signal path. This is why the signal input interface is coarse and large because it has many signal paths. There are tens of hundreds of inserts); at the same time, the anti-interference ability of analog signals is also relatively poor.

2. Digital control signal It is the use of digitally encoded bit signal control information (including parameters and addresses), including a multi-data control signal, usually used in modern computer lighting and digital control equipment. Its biggest advantage is: using a signal line can quickly and accurately transmit dozens of hundreds of optical information to the corresponding equipment, and the transmission distance is very long, high anti-interference, the same type of digital control signal can also It's easy to combine with each other. Its disadvantages are that the corresponding coding and receiving equipments are more complicated, and under the existing technical conditions (encoding and processing technologies), the information it can hold is still limited. There are two commonly used digital control signals:

1) lRS232 digital signal (aka PMX)

It is a serial digital coded signal, introduced by the British pulsar company. A 3-core or 5-core XLR connector is typically used, where 1 is the shield ground and 2 and 3 are signal paths. This signal is mainly used in pulsar consoles and lamps and silicon boxes that accept this signal.

2) DMX512 digital signal It is also a serial digital coded signal. Due to its wider use, it has gradually become a standard for lighting control signals. With the existing transmission ratios and signal processing capabilities, it can transmit optical output signals to 512 optical paths. When using the DMX512 digital signal, in order to ensure accurate signal transmission, it is necessary to use a termination resistor at the end of the signal line.

3. Address Coding Address Coding is a concept that occurs simultaneously with digital control signals. It refers to the determination of lamps or other lighting-driven equipment in a specific position controlled by a digital signal, that is to say: in the lighting equipment signal control system to give them a number similar to the address.

The address code can express the actual position of the luminaire in the system, that is, the true address code: it can also express the starting position of the channel contained in the luminaire in the system. The exact address should be the limbs of the channel. In general, address encoding is accomplished by means of an address encoder, which generally uses a plurality of two-level DIP switches on the address encoder for address setting.

For the address coding, it is necessary to explicitly point out: 1, 2, 3, 4, ... on the general address encoder. . Waiting for several consecutive numbers refers to the encoder's DIP switch number, not the actual address code. The difference between the address code and the DIP switch value is easier to understand. Because the digital signal adopts the binary code way, the address code also melts this kind of thought, it uses the opening and closing of the corresponding DIP switch to achieve the purpose of digital coding.

in fact. The address code corresponding to the Nth DIP switch is regular, that is, 2n-1, which is an exponential form of 2.

In addition, the address coding is in the form of the sum of the address codes corresponding to the DIP switches. For example, the address code corresponding to the above address encoder should be 1+4+8=13, which means that this address code setting is the thirteenth channel in the system's No. 13 lamp or system. If the device includes multiple channels, then its DIP switch setting is the address code of its first channel, followed by the channels. For example: The device has 12 channels, and its DIP switch is set to address 13 so that the channel address occupied by the device in the system is from 13-24.