Pinouts >  RS-232 and other serial ports and interfaces
25 pin D-SUB male connector layout
25 pin D-SUB male connector
at the computer
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 -  
According to 5 reports in our database (2 positive and 3 negative) this pinout may be incorrect.

Is this pinout
PC serial (25 pin) visual pinout:click to enlarge
Source(s) of this and additional information: Hardware Book
Copyright © 2000-2019 by pinouts.ru team, except user uploaded images.
No portion of this webpage may be reproduced in any form without visible link to Old.Pinouts.ru .
Efforts have been made to ensure this page is correct, but it is the responsibility of the user to verify the data is correct for their application.