RS-232 and other serial ports and interfaces
PC serial port (nowdays rare)
Pin Name Dir Description
1 SHIELD - Shield Ground
2 TXD --> Transmit Data
3 RXD <-- Receive Data
4 RTS --> Request to Send
5 CTS <-- Clear to Send
6 DSR <-- Data Set Ready
7 GND - System Ground
8 CD <-- Carrier Detect
9 n/c -  
10 n/c -  
11 n/c -  
12 n/c -  
13 n/c -  
14 n/c -  
15 n/c -  
16 n/c -  
17 n/c -  
18 n/c -  
19 n/c -  
20 DTR --> Data Terminal Ready
21 n/c -  
22 RI <-- Ring Indicator
23 n/c -  
24 n/c -  
25 n/c -  
25 pin D-SUB male connector layout
25 pin D-SUB male connector
at the computer
According to 5 reports in our database (2 positive and 3 negative) this pinout may be incorrect.

Is this pinout
Source(s) of this and additional information: Hardware Book
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