DB9 Male / DB9 Female Null Modem Mini Adapter Go to amazon.com Related posts Top mini modem for 2022 FeatureBrand: STSIModel: NULL-A-9MF DescriptionAlthough this is called a 9-pin null modem adapter because it fits into a 9-pin (DB9) socket, this adapter only has 8 pins. The 9th pin is not typically used in a null-modem adapter, so some manufacturers simply leave it out.
