The term "DB9" refers to a common connector type, one of the D-Subminiature or D-Sub types of connectors. The following schematic diagram show the male (grey background) and female (black background) pin numbering for DB-9 connector. DB9 connectors are designed to work with the EIA/TIA 232 serial interface standard, which determined the function of all nine pins as a standard. It is commonly used for serial peripheral devices like keyboards, mice, joysticks, etc.

DB-9 Connector Pinout

Pin Number Signal Name
1
2
3
4
5
6
7
8
9
Data Carrier Detect (DCD)
Received Data (RD)
Transmit data (TD)
Data Terminal Ready (DTR)
Signal Ground (SG)
Data Set Ready (DSR)
Request to Send (RTS)
Clear to Send (CTS)
Ring Indicator (RI)

DB-9 Connector Pinout Null

DB-9 Connector Pinout Null Modem Wiring Diagram



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