D-sub connector, also known as D-sub miniature, is an analog signal interface connector used to realize the connection function between the cable and the printed board. Because of its unique D-type shield shape, it is also named D-type connector.
The D-Sub connector is bulky, especially when compared with the new connector, it is more bulky, and it is difficult to connect and disconnect in a narrow space. Since the pins in the D-Sub connector housing are exposed, they are prone to bend or break. The best way to avoid pin damage is to protect the pins with D-sub plugs or socket protective covers to prevent them from being damaged when they are not mated. In addition, the male-to-female converter and female head protector help reduce the stress on the connector caused by repeated plugging and unplugging.
D-Sub connectors can be mated without using thumbscrews, but this type of friction fit cannot guarantee that they will always be mated in place. On the other hand, although thumb screws can achieve a firmer connection, they increase the time required for connector plugging and unplugging.
At present, there are still many devices with DB9 ports, and there are also various optional technologies for conversion of traditional products with D-sub connectors. Through the converter between RS232/422/485 and USB, Ethernet and other technologies, you can still use old serial devices for various modern computers.
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