EIA-232 DB-25 Pinout, Asynchronous

EIA-232 Boards with DB-25 cable connectors

The wiring diagram for an EIA-232 DB-25 connector is shown in Table 1.

Table 1:  EIA-232 DB-25 connector

DB-25	Direction	Signal
Shell		GND
2		TxD
3		RxD
4		RTS
5		CTS
6		DSR
7		SG
8		DCD
20		DTR
22		RI