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RS-232 Serial Interfaces
Home > Reference Center > RS-232 Interfaces

Information courtesy Telebyte, Inc.

RS-232 DB-9 Interface (PC COM Port)

Pin Signal Pin Signal
1 Data Carrier Detect 6 Data Set Ready
2 Received Data 7 Request to Send
3 Transmitted Data 8 Clear to Send
4 Data Terminal Ready 9 Ring Indicator
5 Signal Ground    


RS-232 DB-25 Interface

RS-232 (EIA Std.) applicable to the 25 pin interconnection of Data Terminal Equipment (DTE) and Data Communications Equipment (DCE) using serial binary data.
Pin Signal EIA CKT From DCE To DCE
1 Frame Ground AA    
2 Transmitted Data BA   D (Data)
3 Received Data BB D  
4 Request to Send CA   C (Control)
5 Clear to Send CB C  
6 Data Set Ready CC C  
7 Signal Gnd/Common Return AB    
8 Rcvd. Line Signal Detector CF C  
11 Undefined      
12 Secondary Rcvd. Line Sig. Detector SCF C  
13 Secondary Clear to Send SCB C  
14 Secondary Transmitted Data SBA   D
15 Transmitter Sig. Element Timing DB T (Timing)  
16 Secondary Received Data SBB D  
17 Receiver Sig. Element Timing DD T  
18 Undefined      
19 Secondary Request to Send SCA   C
20 Data Terminal Ready CD   C
21 Sig. Quality Detector CG   C
22 Ring Indicator CE C  
23 Data Sig. Rate Selector (DCE) CI   C
24 Transmitter Sig. Element Timing DA   T
25 Undefined