brief introduction: D-SUB is an analog or digital signal interface with different numbers of interfaces as required. D-sub, short for D-subminiature, is a standard for the shape and structure of interfaces. D - sub cable function is to control the installation and connection of equipment, is a common and indispensable thing in daily life. It is mainly used to connect applications with fewer plug and unplug cycles, such as set-top boxes, control equipment and energy meters, computer data, etc.