Pinout of most common Connectors

originally written by Deceed, adopted and translated by P. Luethi with permission

Serial 9 Pin (PC)
Serial 25 Pin (PC)
Parallel (PC)
Centronics (Printer)
PC Gameport / MIDI
Keyboard 5 Pin (PC)
Keyboard 6 Pin (PS/2)
VGA
SCART

Serial 9 Pin (PC)
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(9p D-SUB male at PC (DTE))

(9p D-SUB female at cable / mouse (DCE))

Pin Name Dir Description
1 CD <-- Carrier Detect
2 RXD <-- Receive Data
3 TXD --> Transmit Data
4 DTR --> Data Terminal Ready
5 GND   System Ground
6 DSR <-- Data Set Ready
7 RTS --> Request to Send
8 CTS <-- Clear to Send
9 RI <-- Ring Indicator

Direction seen from PC (TX/RX)

Serial 25 Pin (PC)
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(25p D-SUB male at PC (DTE))

(25p D-SUB female at cable / modem (DCE))

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    

Direction seen from PC (TX/RX)
DO NOT connect SHIELD (1) with GND (7) !

Parallel (PC)
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(25p D-SUB female at PC)

(25p D-SUB male at parallel-cable)

Pin Name Dir Description Register Bit in Register (7=MSB, 0=LSB)
1 STR --> Strobe BASE+2 0 (inverted)
2 D0 --> Data Bit 0 BASE 0
3 D1 --> Data Bit 1 BASE 1
4 D2 --> Data Bit 2 BASE 2
5 D3 --> Data Bit 3 BASE 3
6 D4 --> Data Bit 4 BASE 4
7 D5 --> Data Bit 5 BASE 5
8 D6 --> Data Bit 6 BASE 6
9 D7 --> Data Bit 7 BASE 7
10 ACK <-- Acknowledge BASE+1 6
11 BUSY <-- Busy BASE+1 7 (inverted)
12 PE <-- Paper Empty BASE+1 5
13 SEL <-- Select BASE+1 4
14 AUTFD --> Autofeed BASE+2 1 (inverted)
15 ERR <-- Error BASE+1 3
16 INIT --> Initialize / Reset BASE+2 2
17 SEL IN --> Select Input BASE+2 3
18 GND   Signal Ground    
19 GND   Signal Ground    
20 GND   Signal Ground    
21 GND   Signal Ground    
22 GND   Signal Ground    
23 GND   Signal Ground    
24 GND   Signal Ground    
25 GND   Signal Ground    

Direction seen from PC (TX/RX)

BASE means the base-address of the connection ( normally 378h for LPT1 and 278h for LPT2 ).
BASE+1 is known as status-register, BASE+2 as control-register.
Above address 0000:0408h there is a WORD-value for each installed parallel-port.

Centronics (Printer)
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(36p Centronics female at printer)

(36p Centronics male at printer cable)

Pin Name Dir Description
1 STR <-- Strobe
2 D0 <-> Data Bit 0
3 D1 <-> Data Bit 1
4 D2 <-> Data Bit 2
5 D3 <-> Data Bit 3
6 D4 <-> Data Bit 4
7 D5 <-> Data Bit 5
8 D6 <-> Data Bit 6
9 D7 <-> Data Bit 7
10 ACK --> Acknowledge
11 BUSY --> Busy
12 PE --> Paper Empty
13 SEL --> Select
14 AUTFD ? Autofeed
15 n/c    
16 0 V    
17 CHASSIS GND    
18 +5 V PULL UP   +5 V DC (50 mA max)
19 GND Signal Ground
20 GND Signal Ground
21 GND Signal Ground
22 GND Signal Ground
23 GND Signal Ground
24 GND Signal Ground
25 GND Signal Ground
26 GND Signal Ground
27 GND Signal Ground
28 GND Signal Ground
29 GND Signal Ground
30 GNDRESET Reset Ground
31 RESET <-- Reset
32 ERROR --> Low when offline
33 0 V Signal Ground
34 n/c    
35 +5 V --> +5 V DC
36 SEL IN <-- Select In (Taking low or high sets printer on line or off line respectively)

Direction seen form Printer.

PC Gameport / MIDI
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(15p D-SUB female at PC)

(15p D-SUB male at cable / joystick)

Pin Name Dir Description
1 +5V --> +5 VDC
2 B1 <-- Button 1
3 X1 <-- Joystick 1 - X
4 GND --- Ground
5 GND --- Ground
6 Y1 <-- Joystick 1 - Y
7 B2 <-- Button 2
8 +5V --> +5 VDC
9 +5V --> +5 VDC
10 B4 <-- Button 4
11 X2 <-- Joystick 2 - X
12 MIDI_TXD --> MIDI Transmit
13 Y2 <-- Joystick 2 - Y
14 B3 <-- Button 3
15 MIDI_RXD <-- MIDI Receive

Direction seen from PC (TX/RX)

Keyboard 5 Pin (PC)
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(5p DIN 41524 female at PC)

(5p DIN 41524 male at cable / keyboard)

Pin Name Description Comment
1 CLOCK Clock CLK/CTS, Open-collector
2 DATA Data RxD/TxD/RTS, Open-collector
3 n/c Not connected Reset on some very old keyboards.
4 GND Ground  
5 VCC +5 VDC  

Keyboard 6 Pin (PS/2)
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(6p Mini-DIN female (PS/2) at PC)

(6p Mini-DIN male at cable / keyboard)

Pin Name Dir Description
1 DATA <-> Key Data
2 n/c   Not connected
3 GND --- Gnd
4 VCC --> Power , +5 VDC
5 CLK --> Clock
6 n/c   Not connected

Direction seen from PC (TX/RX)

VGA
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(15p HIGH DENSITY D-SUB female at videocard)

(15p HIGH DENSITY D-SUB male at cable / monitor)

Pin Name Dir Description
1 RED --> Red Video (75 Ohm, 0.7 V p-p)
2 GREEN --> Green Video (75 Ohm, 0.7 V p-p)
3 BLUE --> Blue Video (75 Ohm, 0.7 V p-p)
4 ID2 <-- Monitor ID Bit 2
5 GND --- Ground
6 RGND --- Red Ground
7 GGND --- Green Ground
8 BGND --- Blue Ground
9 KEY   Key (No pin)
10 SGND --- Sync Ground
11 ID0 <-- Monitor ID Bit 0
12 ID1 or SDA <-- Monitor ID Bit 1
13 HSYNC or CSYNC --> Horizontal Sync (or Composite Sync)
14 VSYNC --> Vertical Sync
15 ID3 or SCL <-- Monitor ID Bit 3

Direction seen from PC / Videocard (TX/RX)

SCART
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21 PIN SCART FEMALE(21p SCART female at TV / Video)
21 PIN SCART MALE(21p SCART male at cable)

Pin Name Description Signal Level Impedanz
1 AOR Audio Out Right 0.5 V RMS <1k Ohm
2 AIR Audio In Right 0.5 V RMS >10k Ohm
3 AOL Audio Out Left + Mono 0.5 V RMS <1k Ohm
4 AGND Audio Ground    
5 B GND RGB Blue Ground    
6 AIL Audio In Left + Mono 0.5 V RMS >10k Ohm
7 B RGB Blue In 0.7 V 75 Ohm
8 SWTCH Audio/RGB switch / 16:9    
9 G GND RGB Green Ground    
10 CLKOUT Data 2: Clockpulse Out (Unavailable ??)    
11 G RGB Green In 0.7 V 75 Ohm
12 DATA Data 1: Data Out (Unavailable ??)    
13 R GND RGB Red Ground    
14 DATAGND Data Ground    
15 R RGB Red In / Chrominance 0.7 V (Chrom.: 0.3 V burst) 75 Ohm
16 BLNK Blanking Signal 1-3 V = RGB, 0-0.4 V = Composite 75 Ohm
17 VGND Composite Video Ground    
18 BLNKGND Blanking Signal Ground    
19 VOUT Composite Video Out 1 V 75 Ohm
20 VIN Composite Video In / Luminance 1 V 75 Ohm
21 SHIELD Ground/Shield (Chassis)    

 

 
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