PC CONNECTOR PIN-OUTS
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INDEX OF CONNECTORS

PC Connector Pinout Text File

PIN NUMBERING RULES:

• CENTRONICS/DB STYLE:

• DIN/MINI-DIN:

  DIN and Mini-DIN connectors have an alternating pin numbering scheme. See diagrams in this document for correct pin orientation.

• Main Board (Motherboard) Standard DC Power:

Note: When installing the P8/P9 connector be sure that the four black wires are adjacent to each other. The Red and Orange wires are on the outside.

• Peripheral DC Power:

Note: The power connector used to supply power to fans, hard drives, CD-ROM's, and 5.25" floppy drives.

• IBM AT 101 KEY (ENHANCED) KEYBOARD 5 PIN DIN:

• IBM PS/2:

  

• IBM PS/2 KEYBOARD 6 PIN MINI-DIN:

  PIN	ASSIGNMENT
  1	Data
  2	not used
  3	Ground
  4	+5Vdc
  5	Clock
  6	not used

• IBM PS/2 MOUSE 6 PIN MINI-DIN:

  PIN	ASSIGNMENT
  1	Data
  2	not used
  3	Ground
  4	+5Vdc
  5	Clock
  6	not used

• PS/2 MOUSE ADAPTER CABLE TO MOTHERBOARD 5 PIN INLINE:

  PS/2 PIN	ASSIGNMENT	INLINE PIN
  1	Data	1
  2	not used	2
  3	Ground	3
  4	+5Vdc	4
  5	Clock	5
  6	not used

Note: This is not standard for all motherboards, check your motherboard manual.

• DUAL BAYONET 9 PIN (DB-9) RS-232 SERIAL (COM) PORT:

• DB-25 PIN RS-232 SERIAL (COM) PORT:

Note: Current loop technology was supported in the PC and XT interfaces but was discontinued with the AT. Transmitted and received data are referenced from the data device and not the modem.

• PS/2 TO DB-9 SERIAL MOUSE ADAPTER:

• PS/2 TO DB-25 SERIAL MOUSE ADAPTER:

• DB-9 TO DB-25 SERIAL ADAPTER

• DB-25 FEMALE SERIAL LOOPBACK PLUG WIRING:

• DB-9 FEMALE SERIAL LOOPBACK PLUG WIRING:

SERIAL PORT LOOPBACK DIAGNOSTIC TESTING RULES:

When the diagnostic asserts RTS (output) it then tests for the presence of CTS and Ring Indicator (input). If CTS and RI are detected the RTS driver and CTS/RI receivers are considered operational. When DTR is asserted (output) the diagnostic tests for the presence of CD and DSR (input). If CD/DSR are detected the DTR driver and CD/DSR receivers are considered operational. Data is Transmitted and received on the data lines and the data is compared in the diagnostic buffer. If any status's are not detected an error message is displayed.

• RS-232 SERIAL DB-25 (female) to DB-25 (female) NULL MODEM CABLE:

Note: All other pins are unused. Use this cable pinout for direct connection between two IBM compatible computers. (LAPLINK)

• RS-232 SERIAL DB-25 to SERIAL PRINTER NULL MODEM CABLE:

Note: Use this cable pinout for direct connection between a PC serial port and a serial printer. The 1/4/6 and 6/8/20 loopbacks are to enable the interface as if a modem was attached.

• DB-25 PARALLEL PRINTER:

Note: * denotes and active low signal. This pin out depicts the newer bi-directional parallel port with input and output capabilities often used with external tape drives and accessory devices. If pins 31 or 32 are grounded on a cable the printer will fail to come ready when attached to the PC. This is common on low cost parallel printer cables.

• DB-25 MALE PARALLEL LOOPBACK WIRING:

• DB-25 (male) TO CENTRONICS-36 (male) Standard Parallel Printer Cable:

• GAME PORT DB-15 FEMALE:

• KEYLOCK AND POWER LED:

• EXTERNAL BATTERY (6 VDC):

• SPEAKER:

• TURBO LED:

• DISK ACCESS LED:

• ENHANCED GRAPHICS ADAPTER (EGA) VIDEO CONNECTOR DB-9:

• VIDEO GRAPHICS ARRAY (VGA) HD-15 PIN FEMALE:

• WORKSTATION VIDEO GRAPHICS DB13W3 FEMALE:

NOTE!! Most workstation monitors using DB13W3 connectors are FIXED FREQUENCY or are sync on green monitors and cannot be used as standard VGA monitors on a PC without a special Graphics card to match the horiz/vert frequency requirements of the monitor.

• COLOR GRAPHICS ADAPTER (CGA) DB-9:

• MONOCHROME ADAPTER DB-9:

• MIDI:

• IR Module:

• USB:

CABLE TYPES

TYPE A
Receptacle
Plug

• Ethernet 10/100 Twisted Pair

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