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DB25 pinout and signals for the PC RS232 connector

DB25 pin D-SUB male at the DTE (Computer)DB25 pin D-SUB male

PinNameDirectionDescription
1SHIELD-Shield Ground
2TXDTransmit Data
3RXDReceive Data
4RTSRequest to Send
5CTSClear to Send
6DSRData Set Ready
7GNDSystem Ground
8CDCarrier Detect
9n/c- 
10n/c- 
11n/c- 
12n/c- 
13n/c- 
14n/c- 
15n/c- 
16n/c- 
17n/c- 
18n/c- 
19n/c- 
20DTRData Terminal Ready
21n/c- 
22RIRing Indicator
23n/c- 
24n/c- 
25n/c- 
Note: Direction is DTE (Computer) relative DCE (Modem).
Note: Do not connect SHIELD(1) to GND(7).
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