DB9 male female interface definition

1. Definition of RS-232 (DB9 female / hole) pin

Pin number 2351, 4, 67, 8

The signal definition txdrxd is connected internally

Note: this port can be directly inserted into the COM port of the computer

2. RS-232 (DB9 male / pin) pin definition

Pin number 2351, 4, 67, 8

The signal definition rxdtxd is connected internally

Note: this port can be connected to the equipment communicating with computer

DB9 pin and pin

The serial interface is often used in the development, generally 9-pin serial interface is in the majority.

As shown in the figure below:

  

The male and female connectors used for connecting wires are packaged as shown in the figure above. However, when it is used in the development of the board, the 90 degree bend pin package is adopted.

As shown in the figure below:

  

  

Each pin is defined as:

  

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