Pinouts of Connectors

Serial (DB25) connector pinout

layout
schematic diagram
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Very common PC serial port.

25 pin D-SUB MALE connector pin-out & layout
25 pin D-SUB MALE connector  at the computer
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 -  

Note: Direction is DTE (Computer) relative DCE (Modem).
Note: Do not connect SHIELD(1) to GND(7).

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Pinouts.ru > Pinouts of serial ports >  Pinout of Serial (DB25) connector and layout of 25 pin D-SUB MALE connector

Source(s): Hardware Book
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