In the DB9 connector, D means that the connector is shaped like D. B is the widely used DB25 connector. People misunderstand DB as the name of the D-type connector. In fact, it means the B-type 25-pin connector. The E-type nine-pin connector is called DB9 instead of DE9. TXGA provides DB9 connector products with mature technology, with 15 years of technical accumulation and trustworthy. Click【Product Center】, check inventory, buy immediately, find the goods in seconds.
DB9 is a small model in the D-Subminiature connector, with only 9 pinholes, and is one of the common D-Sub type connectors. DB9 is widely used, mainly in the following three aspects.
1. Communication port
The most widely used D-subs connector is for RS-232 serial communication, although the standard does not mandate this connector. RS-232 devices initially used DB25, but for many applications, the less common signals were omitted, and DB9 female and male connectors were allowed.
Many uninterruptible power supply units are equipped with DB9 connectors to send signals to connected computers via the RS-232 interface. These usually do not send data serially to the computer, but use a handshake control line to indicate low battery, power failure, or other conditions. However, this use among DB connector manufacturers is not standardized and may require special cables.
2. Network port
DE9 connectors are used in some token ring networks and other computer networks. The DB9 connector is usually used for CAN: the DB9 female connector is located on the bus, and the DB9 male connector is located on the device.
3. Computer video output, game controller port
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