Product Description:DB9 male and female interface definition:1. RS-232 terminal (DB9 female/hole) pin definition pin number 2351, 4, 67, 8       Signal Definition TXDRXD Ground Internally Connected Internally ConnectedNote: This port can be directly inserted into the COM port of the computer2. RS-232 terminal (DB9 male/pin type) pin definition pin number 2351, 4, 67, 8       Signal Definition RXDTXD Ground Internally Connected Internally ConnectedNote: This port can be connected to a device that communicates with a computer

DB9 male and female headers and pins