DB9 to DB25 Conversion Pinout

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Pinout and COM Port Summary Card

EIA-232-E (RS-232)
Function
PIN #
DB-25 DB-9
EIA-530
Function
PIN #
DB-25
TO
DTE
TO
DCE
Shield 1   Shield 1    
Transmit Data (TD) 2 3
Transmit Data (A)
(B)
2
14
  >
Receive Data (RD) 3 2
Receive Data (A)
(B)
3
16
<  
Request To Send (RTS) 4 7
Request To Send (A)
(B)
4
19
  >
Clear To Send (CTS) 5 8
Clear To Send (A)
(B)
5
13
<  
DCE Ready (DSR) 6 6
DCE Ready (A)
(B)
6
22
<  
Signal Ground (SG) 7 5
Signal Ground (A)
7    
Received Line Signal Detector (DCD) 8 1
Received Line Signal Detector (A)
(B)
8
10
<  
DTE Ready (DTR) 20 4
DTE Ready (A)
(B)
20
23
  >
Ring Indicator 22 9 N/A     -----


This table is from http://www.bb-elec.com/Learning-Center/All-White-Papers/Serial/Quick-Reference-Card-RS-232-DB9-DB25-pinouts-level.aspx

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