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PC Port Pinouts

The following information is provided as a reference for people looking to connect electronics projects to their PC.

DB25 Parallel Port (Printer)

PIN NO. FUNCTION TYPE
1 STROBE CONTROL
2 DATA BIT 0 OUTPUT
3 DATA BIT 1 OUTPUT
4 DATA BIT 2 OUTPUT
5 DATA BIT 3 OUTPUT
6 DATA BIT 4 OUTPUT
7 DATA BIT 5 OUTPUT
8 DATA BIT 6 OUTPUT
9 DATA BIT 7 OUTPUT
10 ACKNOWLEDGE STATUS
11 BUSY STATUS
12 PE: PAPER TRAY EMPTY STATUS
13 PRINTER ON-LINE STATUS
14 AUTO LINEFEED AFTER (CR) CARRIAGE RETURN CONTROL
15 PRINTER ERROR STATUS
16 INITIALIZE PRINTER CONTROL
17 SELECT/DESELECT PRINTER CONTROL
18-25 UNUSED/GROUND  

RS232 25 Pin Parallel

DB9 (9 Pin Serial)

PIN NO. FUNCTION TYPE
1 DCD Data Carrier Detect
2 RD Receive Data (a.k.a RxD, Rx)
3 TD Transmit Data (a.k.a TxD, Tx)
4 DTR Data Terminal Ready
5 SGND Ground
6 DSR Data Set Ready
7 RTS Request To Send
8 CTS Clear To Send
9 RI Ring Indicator

+-----------------------------+
         DTE       DCE
+-----------------------------+
         TD  ---->  TD
         RD  <----  RD
         RTS ----> RTS
         CTS <---- CTS
         DSR <---- DSR
         SG  -----  SG
         DCD <---- DCD
         DTR ----> DTR

RS232 9 Pin Serial

DB15 (15 Pin Game Port)

PIN NO. FUNCTION
1 XY1 (+5v)
2 Switch 1
3 X1
4 Ground (for switch 1)
5 Ground (for switch 2)
6 Y1
7 Switch 2
8 N.C.
9 XY2 (+5v)
10 Switch 3
11 X2
12 Ground (for switch 3&4) *
13 Y2
14 Switch 4
15 N.C. *

More coming soon…


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