By CONEC 93
The D-Sub connector is a common electronic connector used for signal transmission and connection between electronic devices and circuit boards. The D-Sub connector is a common electronic connector. It is named for the D-shaped metal shielding layer at the joint. It was often used on electronic connectors of computers in the past.
D-Sub connector production and design D-Sub connector has a variety of models, options and accessories, which is a very economical interconnection solution. Including high and low frequency mixed, high current and high density D-Sub connectors, D-Sub connectors, including insulating body, harpoon-shaped board lock, rear cover and multiple conductive terminals; after assembly, the harpoon-shaped board lock is It is limited in the limit mechanism, thus effectively solving the problem of uneven height of the feet caused by the unreliable locking position of the harpoon-shaped plate and easy rotation of the existing D-Sub connector. It is a multi-pin connector mainly used to transmit data, signal and power.
Ⅰ. Application field of D-Sub connector
1. Computer and information technology: D-Sub connectors are widely used in the field of computer and information technology. They are used to connect monitors, keyboards, mice, printers, scanners, modems, and other peripherals.
2. Industrial automation and control systems: D-Sub connectors are widely used in industrial automation and control systems. They are used to connect sensors, actuators, IPCs, PLCs (programmable logic controllers) and other industrial equipment.
3. Communication and network: D-Sub connectors play an important role in communication and network equipment. They are used to connect modems, routers, switches, network cards, serial devices, and other communication devices.
4. Audio and video equipment: D-Sub connectors are used for the connection of audio and video equipment. For example, in audio equipment, D-Sub connectors can be used to connect speakers, microphones, audio interfaces, and other audio equipment.
5. Test and measurement instruments: D-Sub connectors are widely used in test and measurement instruments. They are used to interface with oscilloscopes, signal generators, data collectors, and other test equipment.
Ⅱ. Working principle of D-Sub connector
1. Shielding design: Some D-Sub connectors have a shielding design to reduce the impact of external interference on signal transmission. Shielding is usually provided by metal enclosures or shields to prevent electromagnetic interference and signal crosstalk.
2. Pins and jacks: D-Sub connectors have multiple pins and corresponding jacks. The pins on the plug (male) correspond to the holes on the socket (female). The number and arrangement of pins and sockets depends on the type and specification of the connector.
3. Elastic contact: The pins and sockets in D-Sub connectors usually adopt elastic contact design. The metal contact piece between the pin and the socket has a certain degree of elasticity, so that it can maintain good contact during the insertion and removal process.
4. Mechanical alignment: D-Sub connectors are designed with mechanical alignment to ensure proper alignment between plug and socket. This ensures good contact between the pins and the jack for reliable signal transfer.
5. Signal transmission: D-Sub connectors are used to transmit various types of signals, including power signals, analog signals and digital signals. Each pin is responsible for carrying a specific signal. For example, some pins carry data signals, while other pins carry ground, power, or other control signals.
Ⅲ. Classification of D-Sub Connectors
1. According to the number of pins
9-Pin D-Sub Connector (DB9): Typically used for serial communication interfaces such as RS-232. With 9 pins and corresponding jacks, it is often used in computers and communication equipment.
15-pin D-Sub connector (DB15): Commonly used for video graphics interfaces, such as VGA. Has 15 pins and corresponding jacks.
25-pin D-Sub connector (DB25): Commonly used for parallel communication interfaces, such as printer ports. With 25 pins and corresponding jacks, it is often used for parallel communication interface.
2. According to purposes and standards
MIL-DTL-24308: Military-standard D-Sub connectors for increased reliability and durability for military and aerospace applications.
D-Subminiature RF Connector: For RF applications such as antenna connections.
3. According to the size of the D-Sub shell
High-Density D-Sub: Also known as HDD, it has a smaller case size and higher pin density, such as DD15, DD26, etc. These connectors enable more signal channels for applications requiring higher density connections.
D-Subminiature: Also known as Standard D-Sub, the common ones are DB9, DB15, DB25, etc. These connectors are commonly used in computer and communication equipment.
Ⅳ. Features of D-Sub Connector
1. Elastic contact: The pins and sockets of D-Sub connectors usually adopt elastic contact design. This design provides a firm contact between the pins and the receptacle, maintaining a stable electrical connection during mating and unmating.
2. Multi-pin connection: D-Sub connectors usually have multiple pins to provide multiple signal channels. This makes them suitable for transmitting a variety of signal types including data, signals and power.
3. Easy to install: The installation of the D-Sub connector is relatively simple, usually need to insert the plug and tighten the screw to fix the connector. This makes the installation process quick and easy and provides a solid connection.
4. Mechanical alignment: D-Sub connectors are designed with mechanical alignment to ensure proper alignment between plug and socket. This ensures good contact between pins and jacks, reducing contact impedance and interference in signal transmission.
5. Sturdy and durable: D-Sub connectors usually use metal shells, which have high strength and durability. This enables them to withstand stresses such as vibration, shock and temperature changes in harsh environments, ensuring reliable connection performance.
6. Economical and practical: D-Sub connectors have wide availability and relatively low cost in the market. This makes them a cost-effective connectivity option in many applications.
The D-Sub standard connector refers to a connector that conforms to the D-Sub standard specification. D-Sub connectors usually adopt the design of D-Subminiature connectors, so named because of their D-shaped appearance. The D-Sub standard specification stipulates parameters such as the size, pin arrangement, insertion force, electrical characteristics and mechanical characteristics of the connector to ensure the interoperability and compatibility of the connector.
Ⅵ.D-Sub High Density Connector
D-Sub high-density connector is a special type of D-Sub connector designed to provide higher pin density for more signal channels in a smaller space. Compared with traditional D-Sub connectors, high-density connectors have a smaller shell size and more pins.
High-density D-Sub connectors are similar in design and use to traditional D-Sub connectors, but have a higher pin count and smaller shell size. This makes them suitable for applications requiring higher density connections and compact space requirements.
Common D-Sub high-density connectors:
1. DD15 connector: Compared with the traditional DB15 connector, the DD15 connector has a smaller shell size and higher pin density. It is typically used in applications that require a higher pin count but have limited space.
2. DD26 connector: The DD26 connector is smaller than the traditional DB25 connector, but has more pins. It is suitable for applications requiring higher pin density, such as industrial control systems and test equipment.
A D-Sub dual-port connector is a special type of D-Sub connector that has two connection ports, allowing two devices or systems to be connected simultaneously on a single connector.
Common D-Sub dual-port connectors:
1. Other dual-port connectors: In addition to DB9 and DB15, other D-Sub connector types (such as DB25, DD15, DD26, etc.) can also have a dual-port design, depending on the application requirements.
2. Dual-port DB15 connector: The dual-port DB15 connector has two DB15 jacks, which are used to connect two DB15 plugs at the same time. It is often used in applications of video graphics interfaces such as VGA, allowing two monitors or projectors to be connected to the same computer.
3. Dual-port DB9 connector: This connector has two DB9 jacks, which are used to connect two DB9 plugs at the same time. It can be used in data communication applications, such as serial communication or data acquisition systems, allowing bi-directional data transfer between two devices.
Frequently Asked Questions
1. How to maintain and maintain the D-Sub connector?
Regular cleaning of the connector will remove accumulated dust, grime and oxides to maintain a good contact. Gently wipe the housing and pins of the connector with a static-free cloth, being careful not to use solvents containing corrosive substances. D-Sub connectors avoid strong shocks and vibrations when connecting devices to prevent pins from bending or breaking. Make sure the connector is firmly fixed on the device, and avoid frequent plugging and unplugging operations. When plugging and unplugging the D-Sub connector, insert and pull it out vertically, and avoid twisting or excessive force from the side. Make sure the plug is properly aligned with the socket to avoid bending or damaging the pins. Periodically inspect the connector pins for bent, damaged, or signs of rust. If a problem is found, the connector should be replaced or repaired in time.
2. What are the steps to plug and unplug the D-Sub connector?
Make sure the device and connectors are turned off, and disconnect the power or signal source. Insert the D-Sub plug vertically into the D-Sub socket. Make sure the pins and sockets are aligned and do not apply forceful sideways twisting. If the D-Sub connector has a screw retention mechanism, use an appropriate screw or locking device to secure the connector to the device. When you need to plug and unplug the D-Sub connector, be sure to disconnect the power or signal source first to avoid hot plugging.
3. What types of signal transmission does the D-Sub connector support?
Digital signals: D-Sub connectors can be used to transmit digital signals, such as serial communication interfaces (such as RS-232, RS-422, RS-485) used in computers, communication equipment, and embedded systems.
Data signals: D-Sub connectors can transmit various types of data signals, including serial data, parallel data, trigger signals, etc.
Analog signals: D-Sub connectors are suitable for transmitting analog signals, such as audio interfaces and video interfaces used in audio and video equipment, such as VGA (Video Graphics Array) interfaces.
Power signal: Some D-Sub connector configurations can support the transmission of a power signal, which is used to provide the power required by the device.
Control signals: D-Sub connectors can also be used to transmit various control signals, such as sensor signals, actuator signals, and control signals used in industrial control systems.