Short introduction of USB DB9
The DB9 connector (originally named DE-9) is an analog socket, with 9 pins, from the D-Subminiature (D-Sub) connector family. The DB9 has the smallest "footprint" of the D-Subminiature connectors. The prefix “D” represents the D-shape of the connector shell. The DB9 connector is mainly used in serial ports, allowing asynchronous data transmission according to the RS-232 standard (RS-232C). Note that there are DB9-DB25 adapters that easily convert a DB9 socket to DB25 and vice versa.
If you want to learn more, try to follow the below link to see the article about DB9.
https://www.utmel.com/componen....ts/db9-tripp-lite-in
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