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Complete Pinout Guide for
Parallel Port, Serial Port, Network, PS2 & Monitor Cables
Everything for DCC (Direct Cable Connection of Win95/98), Normal and Null Modem Cables, etc.
Guide compiled/collected/prepared/experimented by Mahendra from India
New and final location of this great pinout page is  http://www.infonewsindia.com/pinout/
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WHY DON'T I ANSWER MANY OF YOUR QUERIES? Read FAQ PAGE and then Email me your questions with details 
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BEFORE EMAILING ME PLEASE READ THE THIS PAGE AND FAQ PAGE CAREFULLY AND DO NOT ASK ANY TECHNICAL QUESTIONS OR ANYTHING FOR CABLING PROJECTS (I WON'T BE ABLE TO HELP) AS I AM JUST A COLLECTOR AND EXPLORER OF ALL THE INFORMATION. MANY OF THE QUESTIONS ARE ALREADY ANSWERED ON THE WEBPAGE OR MOSTLY ON FAQ PAGE. BELIEVE ME I GET AT LEAST 25 EMAILS ON THIS WEBSITE A DAY AND ANSWERING THEM IS NOT AN EASY TASK. IF YOU ARE LUCKY YOU MAY GET REPLY IN A DAY OR IT MAY TAKE SOMETIMES A WEEK. ALSO IN EMAILS GIVE ME DETAILS OF YOUR PROBLEM INCLUDING YOUR SYSTEM CONFIGURATION AND OTHER DETAILS WHICH MIGHT HELP ME UNDERSTAND YOUR PROBLEM AND SAVE MY TIME IN GUESSING. ;-)

 
INDEX of Chapters
0. WARNING  and A Request To The Women Of Whole World
1.  Preface
2. IBM Basic concepts of Computer Cabling.
3. IBM DB-25 and DB-9 diagrams.
4. IBM DB-25 and DB-9 numbering scheme.
5. IBM Serial port Pin Descriptions (Wire name) for each pin number.
6A. IBM Parallel port Pin Descriptions (Wire name) for each pin number.
6B. IOMEGA ZIP DRIVE / Any Scanner for Parallel port Cable Pinouts.
7A IBM Parallel Port Laplink Cable Pinouts.(for DCC of WIN9x.)
7B DCC (Direct Cable Connection) Feature of Win9x/Me/200 Setup (updated)
7C Serial Port Null-modem Cable (for DCC of WIN9x.)
7D Transferring Data with INTERLNK.EXE and INTERSVR.EXE in pure DOS mode.
8 IBM Null-Modem pinouts. (DB-25 to DB-25), (DB-9 to DB-9) and (DB-25 to DB-9).
9 IBM Normal Modem (Cable) pinouts. (DB-25 to DB-25) and (DB-25 to DB-9).
10 The pin-configuration of Internal Serial Cables inside Cabinet.
11 All about network Cable (RJ45 Jack Basics) (updated)
12 STANDARD SVGA/VGA Monitor Cabling
13 FAQ Page (Frequently Asked Questions)
14 Utility Softwares to test Parallel and Serial ports
15 USB (Universal Serial Bus) Fundamentals
16 Other Cables Pinouts and DCC of WIN95 Related Links
17 Keyboard Connector Pinouts (ATXT normal to PS2)
18 PS2 Mouse Fundamental (Serial port to PS2) and (PS2 to Serial port) Pinouts

1. PREFACE

Here are several diagrams and tables explaining parallel port, serial port and null-modem configurations, which are mostly available on Internet. I was forced to provide this information on the Internet by myself when my search began for getting Laplink Cable or Null Modem Cable to transfer data from one Win95 PC to another Win95 PC in Sept-97. I bought the Laplink cable in the market and that served my purpose as I successfully transferred data from "HOST" to "GUEST" computer with Laplink. But also I was bit worried with the cost of LAPLINK cables available in the market as I purchased it at least thrice the cost of its material cost. Let's discuss this in Indian Rupees. I purchased Laplink cable at Rs.120/- in the market. But the material cost I calculated was only Rs.50/- if we prepare this at home if you have a logically working BRAIN and a little bit knowledge of soldering wires, which most of us do while repairing toys or portable radios. So I did opened the D-25 Female pins of my Laplink cable and studied the colour combinations of wires and prepared the following PINOUT Chart for those who want to make LAPLINK Cable at home. (THIS IS JUST AN INFO PAGE, BUT PLEASE USE THIS INFO AT YOUR OWN RISK.)

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2. BASIC CONCEPTS OF COMPUTER CABLING

A PARALLEL port can consist of only 25 pin port adapter called a DB-25 and a serial port can consist of either a 25 pin port adapter called a DB-25 or 9 pin adapter called a DB-9 port adapter. Whether the port is a 9 pin or 25 pin it can accomplish all of the same tasks that serial port communications have been designed for.

Each adapter can be a male type connector with pins or a female type adapter with tiny holes.
Generally a PRINTER port (called LPT1) on the back of a computer is female type adapter and we need to use MALE DB-25 pin cable on it for PRINTER connection or for parallel LAPLINK cable.

And a COM port on the back of a computer is male for the serial ports but it may not necessarily be. Below are diagrams of a DB-25 and DB-9.

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3. IBM DB-25 and DB-9 diagrams.

(Each diagram on this page is the view you see when you look into the end of the cable from the outside of the cable.)

The "o" characters represent holes, the "." characters represent pins.
A DB-25 looks like this...


Diagram #1
Female:                          Male:
_____________________________  _____________________________
\ o o o o o o o o o o o o o /  \ . . . . . . . . . . . . . /
 \ o o o o o o o o o o o o /    \ . . . . . . . . . . . . /
  -------------------------      -------------------------
 
  And a DB-9 is like this...

Diagram #2
Female:         Male:
_____________  _____________
\ o o o o o /  \ . . . . . /
 \ o o o o /    \ . . . . /
  ---------      ---------

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4. IBM DB-25 and DB-9 numbering scheme. (Pin numbers)

Each pin has a number assigned to it. When connecting null modem, for example, it is important to know these numbers in order to select the correct cables, or when making your own cables.

DB-25 Connector
Chart #1 (Female) 

  13              <------- 1
 _____________________________
 \ o o o o o o o o o o o o o /
  \ o o o o o o o o o o o o /
   -------------------------
    25             <----- 14
Chart #2 (Male) 

  1 ------->              13
 _____________________________
 \ . . . . . . . . . . . . . /
  \ . . . . . . . . . . . . /
   -------------------------
   14 ----->             25
DB-9 Connector
Chart #3 (Female) 

   5 4 3 2 1
 _____________
 \ o o o o o /
  \ o o o o /
   ---------
    9 8 7 6
Chart #4 (Male) 

   1 2 3 4 5
 _____________
 \ . . . . . /
  \ . . . . /
   ---------
    6 7 8 9

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5. IBM Serial port Pin Descriptions (Wire name) for each pin number.

For following all connections we may use these chart for transmission of Data via Serial Port.

Chart#11
Pin assignments
DB-25
2 TD Transmit Data
3 RD Receive Data
4 RTS Request to send
5 CTS Clear to send
6 DSR Data Set Ready
7 SG Signal Ground
8 DCD Data Carrier Detect
20 DTR Data Terminal Ready
22 Ring Ring Indicator
Chart#12
Pin Assignments
DB-9
1 DCD Data Carrier Detect
2 RD Receive Data
3 TD Transmit Data
4 DTR Data Terminal Ready
5 SG Signal Ground
6 DSR Data Set Ready
7 RTS Request to Send
8 CTS Clear to Send
9 Ring Ring Indicator

IMP. NOTE : In DB-25 serial cable following numbered pins are NOT USED. They are 1, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21, 23, 24 and 25. IMP. NOTE : In DB-25 serial cable following numbered pins are NOT USED. They are 1, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21, 23, 24 and 25.
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6A. IBM Parallel port Pin Descriptions (Wire name) for each pin number.

Hi there, as far as I am concerned it is very difficult to make your own printer cable and anyways they are cheap and easy to find in a store down there on the street. REMEMBER I AM NOT ANY TECHNO-WIZARD. So don't ask me details of each pins. You can email your problems regarding this section to the author of the chart mentioned below. But, I am giving the collection of data transmission of most common cables for everybody's reference. Following is the chart for transmission of Data via Parallel Port.

Chart#13
Pin Assignments of Parallel Port (LPT1)
Female DB-25 on PC
<= in
or
=> out		 DB25
Pin		 Cent
Pin		 Name of
Signal 		Reg
Bit		 Function Notes
=> out 1 1 -Strobe C0- Set Low p1ulse >0.5 us to send
=> out 2 2 Data 0 D0 Set to least significant data
=> out 3 3 Data 1 D1 ...
=> out 4 4 Data 2 D2 ...
=> out 5 5 Data 3 D3 ...
=> out 6 6 Data 4 D4 ...
=> out 7 7 Data 5 D5 ...
=> out 8 8 Data 6 D6 ...
=> out 9 9 Data 7 D7 Set to most significant data
<= in 10 10 -Ack S6+ IRQ; Low Pulse ~ 5 uS, after accept
<= in 11 11 +Busy S7- High for Busy/Offline/Error
<= in 12 12 +PaperEnd S5+ High for out of paper
<= in 13 13 +SelectIn S4+ High for printer selected
=> out 14 14 -AutoFd C1- Set Low to autofeed one line
<= in 15 32 -Error S3+ Low for Error/Offline/PaperEnd
=> out 16 31 -Init C2+ Set Low pulse > 50uS to init
=> out 17 36 -Select C3- Set Low to select printer
== 18-25 19-30,
33,17,16		 Ground - Do not connect any of these grounds to a shield

Imp. Note:
Some cables, ports, or connectors may not connect all grounds. Centronics pins 19-30 and 33 are "twisted pair return" grounds, while 17 is "chassis ground" and 16 is "logic ground".

"<= In" and "=> Out" are defined from the viewpoint of the PC, not the printer. The IRQ line (-Ack/S6+) is positive edge triggered, but only enabled if C4 is 1.

Pinouts Source: Extracted from "Interfacing the IBM PC Parallel Printer Port" by Zhahai Stewart zstewart@hisys.com

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6B. IOMEGA ZIP DRIVE / Any scanner for Parallel Port Cable Pinouts
(Also called Straight-through PP Cable)

Most of the External Parallel Port devices like IOMEGA ZIPDRIVE and most Scanners use Straight-through Parallel Port cable with Straight pinouts like 1 to 1, 2 to 2, 3 to 3 and so on up to 25 to 25.  The straight-thru cable is also used for Printer Data Switches between motherboard and the data-switch.   Though I am not sure about other Parallel Port Devices like External CDROM drives, you can give it a try for other units at your own risk. Read WARNING.

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7A. Parallel Port Laplink Cable Pinouts

Laplink cable is used to link two PCs with MSDOS 6.0 or later, very effectively by using INTERSVR.EXE (on Host) and INTERLNK.EXE (on GUEST) PCs.  But it can also be used to data-transfer at faster speed with DCC Feature of Win9x/Me/2000.

If you are seeking to buy a Parallel port Laplink cable, or trying to make your own cable, you should know what pins need to be switched in order to make it. Below is a chart of what pins go to what on the other end. Only 18 pins are used in a Laplink Cable, therefore I will only show those eighteen here.

To make this cable we need
1. TWO numbers of DB-25 Male Sockets.
2. Shielded Cable with 18 cores (lines of wires).

Chart#5
DCC Parallel Laplink Cable Pinouts.
Male DB-25 ==>> Male DB-25
1 Both Not used
2 to 15
3 to 13
4 to 12
5 to 10
6 to 11
7 Both Not used
8 Both Not used
9 Both Not used
10 to 5
11 to 6
12 to 4
13 to 3
14 Both Not used
15 to 2
16 Both Not used
17 to 19
18 to 18
19 to 17
20 Both Not used
21 to 21
22 to 22
23 to 23
24 Both Not used
25 to 25
Pinbody* to Pinbody

* = In my cable one wire was attached to the metal body of the Male pins on both sides. Total 18 wired cable is necessary for this cable including one wire for Body of the pin too.

SPEED: Parallel port Laplink cable is little faster than Serial port Cable because of more numbers of cores of wires used in Parallel port cable (25 pin) than Serial port Cable (9 pins). The expected speed is 2000kbytes/second but it is extremely dependent on the different quality chipset structure of Parallel Ports on different makes of the Motherboards. Some even reported me the lowest speed of 60kb/sec even though all other settings are correct. Its recommended that you setup LPT1 mode as only "ECP/EPP" or "ECP" mode in bios to get better speed, and not the "Normal" (4bit/8bit) modes.  The latest tests done by me on modern motherboard proved that serial port transfers are equal or little slower than parallel ports.

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7B. Important Points  for DCC (File-transfer) of Win9x/ME/2000 with LAPLINK (Printer port) Cable or Null-Modem (serial port) Cable. (NEW)

Laplink cable is also successfully used by me to link two PCs for only FILE TRANSFER (not playing Games), with WIN95 and Direct Cable Connection program with common protocol as "NETBEUI" on both Computer's Network Section of Control Panel. In Network section you must have installed "Client for Microsoft Networks", "File and Printer Sharing for Microsoft Networks" and two useful and important protocols, which are "TCP/IP" and "NetBEUI".  Both the options in "File and Print Sharing" button should be selected (checked) to allow all users to access files and printer. You should see at least these items in NETWORK section in Control Panel.
  1. Client for Microsoft Networks
  2. TCP/IP
  3. Netbeui
  4. File and Printer Sharing for Microsoft Networks

There are some more items found already in above list such as "Dial-up Adaptor" or "Microsoft Family Logon" , but leave them as it is as they are not going to make any difference.  The windows reboots/restarts after all changes/additions are made.

You should also share the Disks on both computer by right-clicking on disks found inside "My Computer" folder on desktop.  This will show the disks available for file transfer on both computers.

Now connect the Cable. Then start DCC program on one computer in HOST mode and on other machine in GUEST mode. Also only two computers can be connected to each other for only FILE TRANSFER and not for anything else. The rest is explained in HELP and Troubleshooting Section of WIN95 itself. PLEASE DO NOT EMAIL ME FOR THE DCC OF WIN95/98 FOR THIS, BELIEVE ME YOU WILL FIND THE BETTER INFO IN HELP OF WIN9x or try my FAQ page for more info.

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7C. NULL-MODEM cable for DCC file transfer?(NEW)

Yes! About a DCC of Win9x thru Serial Port a very important information I am going to put over. Please read carefully. We can also use Null-modem cable to use with DCC for Data transfer on Serial port with all above settings identical as we use for DCC with Laplink Cable on Printer Port. Please do not get confused with DTE and DCE descriptions on that site as DTE is DB9 or DB25 MALE pin as found on system and DCE is DB9 or DB25 Female socket/pin as found on Modems. We usually get MALE DB9 or DB25 pin serial ports on our computers which can also be called DTE type port.

Speed: The speed I tested with the help of several utility softwares proved that the transfer can go really very high upto 2000 kbytes per second on modern pentium motherboards.  Only thing which should be done is that we must set the serial port speed to 115200 bits in Device Manager section of System settings in Control Panel of Win9x. This is more than the speed of parallel port transfer of files with laplink cable.  Of course all motherboards do not support this.

So, just Enjoy. Next section is how to build your own Null-Modem cable.

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8. IBM Null-Modem Cable pinouts. (DB-25 to DB-25), (DB-9 to DB-9) and (DB-25 to DB-9).

For making Null modem cable following is a chart of pinouts. Only 8 pins are used in a null modem, though there are 25 pins on DB-25 socket. You need 8 or 9-wired cable with two DB-25-Female pin socket or DB-9-Female pin socket or one of both.

IMPORTANT : Both pin sockets must be of FEMALE type. This may not be applicable on some machines, so please check your serial ports of both the machines as there must be MALE pins at back of your both computers.

Chart #6 Chart #7 Chart #8
Null-Modem Pinouts
DB-25 to DB-25
2 to 3
3 to 2
4 to 5
5 to 4
6 and 8 to 20
7 to 7
20 to 6 and 8
Null-Modem Pinouts
DB-9 to DB-9
1 and 6 to 4
2 to 3
3 to 2
4 to 1 and 6
5 to 5
7 to 8
8 to 7
Null-Modem Pinouts
DB-25 to DB-9
2 to 2
3 to 3
4 to 8
5 to 7
6 and 8 to 4
7 to 5
20 to 6 and 1

Now why this cable is called null modem without using the modem?

by grimace :- That's good question. But if you think a little bit, you will get an answer that as we don't use modem and use modem-like connection on two computers staying together, so we call it Null-Modem Connection.

Most important is, as you may know that modem have its own data-transmission method and special combination of the data input-output is required to be configured to each pin of the modem cable so the special modem to computer cable is used. But if you give more attention on CHART#11 and CHART#12 of my page you will get an idea that how actual the DATA-TRANSMISSION takes place. Now if we want to play multiplayer game from remote areas we need to connect systems with MODEMS as follows...

MODEM GAME PLAY
A's Computer ###### A's MODEM ------> TELEPHONE CO.----->B's MODEM ###### B's Computer

In above (1st) diagram '######' is the cable which connects the Computer to MODEM. The one which comes with modem.

NULL MODEM GAME PLAY
A's Computer =================== B's Computer

In this (2nd) diagram '===========' resembles the null modem cable emulating the 1st transmission. Now in above method the Null modem Cable's pinouts are adjusted in such a way that it emulates the modem connection to the same DATA-TRANSMISSION as MODEM to Computer connection requires. See chart#9 and #10. Therefore it is called Null-Modem cable. Hope I could explain you the whole saga. <phew>

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9. IBM Normal-Modem Cable pinouts. (DB-25 to DB-25) and (DB-25 to DB-9).

IMPORTANT : Both pin sockets must be of DIFFERENT type. This means that for modem-side of cable we need to use MALE type of DB-25 pin. And on CPU side of cable we need to use FEMALE type of DB-25 or DB-9 pin.

Chart #9 Chart #10
Normal-Modem Pinouts
DB-25 to DB-25
2 to 2
3 to 3
4 to 4
5 to 5
6 to 6
7 to 7
8 to 8
20 to 20
22 to 22
PinBody* to Pinbody*
Normal-Modem Pinouts
DB-25 to DB-9
2 to 3
3 to 2
4 to 7
5 to 8
6 to 6
7 to 5
8 to 1
20 to 4
22 to 9
PinBody* to Pinbody*

* Pinbody is OPTIONAL. We easily get cable with 9-wires in it, but not 10 then Pinbody can be attached with shielded wire. The one which I examined from a reputed company was having body of pins connected with shielded wire (let's assume earthing line.)

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10.The pin-configuration of Internal Serial Port Cables inside Cabinet.

The pin-configuration of internal serial cables (the one that connects from the motherboard to the case) are different for different motherboards, which come in two types. One with straight pins as in old mobos like 286/386/486. And another is twisted style cable like in latest Pentiums. The MALE DB9 pin is connected to serial port on motherboard with 9 wired cable in following two types. Both Serial ports on motherboard have 10 wires but only 9 of them to connect to MALE DB9 Serial Pins. Please do not connect 10th core anywhere.

Chart# 14
DB9 Pinouts of
STRAIGHT SERIAL PORT
on 286/386 systems
Cable Wire number
on motherboard		 Wire Connected
to male DB9 pin
on cabinet.
1 Red Wire 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
9 9
  
Chart# 15
DB9 Pinouts of
TWISTED TYPE SERIAL PORT
on modern systems
Cable Wire number
on motherboard		 Wire Connected
to male DB9 pin
on cabinet.
1 Red Wire 1
2 6
3 2
4 7
5 3
6 8
7 4
8 9
9 5

The MALE DB-25 pin is connected to serial port on motherboard with 9 wired cable (Yes, 9-wired cable) in following two types. Both Serial ports on motherboard have 10 wires to connect to MALE DB25 Serial Pins as follows. Take it.

Chart# 16
DB25 Pinouts of
STRAIGHT SERIAL PORT
on 286/386 systems
Cable Wire number
on motherboard		 Wire Connected
to male DB25 pin
on cabinet.
1 Red Wire 8
2 3
3 2
4 20
5 7
6 6
7 4
8 5
9 22
  
Chart# 17
DB25 Pinouts of
TWISTED TYPE SERIAL PORT
on modern systems
Cable Wire number
on motherboard		 Wire Connected
to male DB25 pin
on cabinet.
1 Red Wire 8
2 6
3 3
4 4
5 2
6 5
7 20
8 22
9 7

NOTE: The 10th Core Wire from motherboard is an Optional line which can be connected to pin 1 of DB25 with no harm.

IMP: Above are the exact pinouts of the all four types of working serial ports with me for IBM Machines. Believe me, they should work. Please see Chart#11 and Chart#12 in Section 5 of this page for pin-Descriptions of DB9 and DB25 Serial ports.

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16. Other Links

Help on Direct Cable Connection in Win95 by Acclaim@geocities.com

Apple Mac users guide on Modem Pinouts by RADICAL Systems

Date: wed, 24 Sep 1997 19:51:38 +0100 From: One of the Visitor
To: (pinout@indiacam.net) CONTENT : Would you happen to have the pinouts for a 15 pin monitor connector? I have a Compaq and I can't use the volume control on my monitor with my new Stealth 3D card. The volume is controlled by the mother board from the monitor to the sound card. I'd like to make a patch cable to fix this problem. I can't seem to get the answer I want from Compaq.

The visitor himself finds the solution on http://www.interlog.com/~gscott/t-DB15VGA.html

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WARNING
THESE PINOUTS ARE OF THOSE CABLES WHICH I USED SUCCESSFULLY, THEN OPENED AND EXAMINED BY ME FOR YOU. BUT PLEASE USE THIS INFO AT YOUR OWN RISK AND DON'T HOLD RESPONSIBLE TO ME IF YOU MESS IT UP. NOBODY IS PERFECT SO NEITHER I.  I AM NOT RESPONSIBLE IF YOU BLOW-UP OR BURN YOUR COMPUTER. EXCEPT ELECTRICAL VOLTAGE PINS, EVEN DATA SIGNALS SENT THROUGH CABLES ARE PRODUCED WITH SOME ELECTRONIC PULSES AND THAT MAY DAMAGE THE EXPENSIVE DELICATE ITEMS LIKE PALMS, LAPTOPS OR MOBILE DEVICES. DO NOT EXPERIMENT WHEN YOU ARE NOT EDUCATED PROPERLY IN ELECTRONICS. You must study electronics before you do this else it may result in Hazardous event. Don't say later that I did not warn you.
Anyways as suggested by one of the visitor, Rodolfo Ortega Paredes who successfully prepared the null modem pinout like other million visitors, I want to proudly state in his own words that "The soldering of the cables mentioned on this site, is up to you, the information has no errors."

A Request To The Women of Whole World.
Please forgive me for using a word "FEMALE" throughout this pinout pages. Believe me it was necessary to understand the subject better. Anyways it was not my idea. Please do not get any wild ideas from this technical information. Of course the word "FEMALE" on these pages is used only for technical point of view. And yes, biology is not my subject. Thanks for your understanding. I hope matured men will not have any objection with word "MALE". ;-)

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Please read the website carefully and only if you have something extra to ask then email me with your requests, changes, questions, corrections by specifying Chapter Numbers and Diagram Numbers. Thanks for visiting.
pinout@indiacam.net?subject=portinfo: