What Is a D-Sub Connector?
A D-sub connector is a standardized interface for connecting computers to peripheral devices, named for its “D”-shaped metal shield designed to minimize electromagnetic interference. Available in over 20 varieties, D-sub connectors vary by pin count and size, accommodating a wide range of applications.
Uses of D-Sub Connectors
Once a prevalent standard, D-sub connectors have specific uses based on their pin configurations:
1. 9-Pin D-Sub
Used primarily for RS-232C and RS422 serial communications, the 9-pin variant has historical significance in gaming consoles and computers. It also finds applications in SCSI-3 and Fibre Channel standards.
2. 15-Pin D-Sub
Commonly known as a VGA terminal, the 15-pin D-sub is integral to connecting PC monitors. Despite the rise of digital interfaces like HDMI and DVI, its versatility keeps it in use.
3. 25-Pin D-Sub
This variant supports RS-232C serial interfaces, SCSI for Macintosh, and PC/AT printer connections. While larger than its 9-pin counterpart, it remains relevant for certain devices.
4. 37-Pin D-Sub
The 37-pin D-sub is specialized for professional digital audio and certain SCSI equipment. It’s uncommon in consumer applications but valued in industrial and audiovisual sectors.
Principle of D-Sub Connectors
D-sub connectors feature a housing for electrical contacts, a protective metal hood, and eyelets for securing the connection. They are designed for both plug (male) and socket (female) forms, offering EMI shielding and a variety of screw types for secure attachment.
1. Hood of D-Sub Connector
The metal shell, or hood, serves dual purposes: providing structural integrity and acting as an EMI shield to protect signal integrity.
2. Screw of D-Sub Connector
Secured with screws, D-sub connectors require compatibility between plug and socket screws, available in various lengths and measurement systems.
3. Number of Pins of D-Sub Connector
The pin count, such as the well-known 15-pin DE-15 for VGA connections, dictates the connector’s application, with designs tailored to specific signal assignments.