A DB-9 connector is a 9 pin serial connection which is mostly used on laptop and desktop computers, as well as token ring connections . The DB-9 connector is commonly used for the 1st serial port (COM1). The serial ports are called "COM ports" and are labeled as COM1, COM2, etc. The COM1 on a PC, is typically DB-9 type connector and is commonly connected to the mouse.
DB-9 Female Connector:
These connectors are used either with shielded or un-shield cables with up to nine signal wires. However, all the pin positions may not be used. This is typically used for connection to nine-pin serial ports on PCs.
DB-9 Male Connector:
These connectors are used either with shielded or un-shielded cables with up to nine signal wires. Here again, all pin positions may not be used. Its typical usage is for extension cables.
