Normal(?) Computer Hardware Cables#

Serial Cables#

Found this site and they have already done a lot of this, so here are some links:

Other Cable Stuff#

This is a list of the pinouts to the more common PC hardware interfaces. It is by no means complete. While I have taken care not to make any mistakes, I urge you to take caution when using these tables. Also, please keep in mind that these are only tables, they are not a guide to hardware hacking and do not attempt to explain drive capabilities, signal timings, handling care, or other interface issues. As always, make sure you know what you're doing before you start hooking wires to your PC.

Connector Styles and Pin Numbering#

 5pin DIN Male          DB15-S Male
    --+--               ----------------------
   /  ^  \              \   1  2  3  4  5    /
  | 1   3 |              \ 6  7  8  9 10    /
   \ 425 /                \ 11 12 13 14 15 /
    -----                  ----------------

DB9 (DE-9) Male                DB15 (DA-15) Male
-------------           --------------------------
\ 1 2 3 4 5 /           \ 1  2  3  4  5  6  7  8 /
 \ 6 7 8 9 /             \ 9  10 11 12 13 14 15 /
  ---------               ----------------------

DB25 Male                             IDC-50 Male
 ------------------------------        -------------------
 \ 1  2  3  4  5  7  8 ... 13 /       | 1  3  5  7 ... 49 |
  \ 14 15 16 17 18 .......25 /        | 2  4  6  8 ... 50 |
   --------------------------          -------------------

(Power Connector) Male
  __________
 /          | 4  3  2  1 |   -->    Called "CEE-type (male)"
 ------------

30 pin SIMM                         72 pin SIMM
-------------------------------     ---------------------------------------
|                             |     |                                     |
 )                            |      )                 _                  |
 --|||||||||||||||||||||||||---      --|||||||||||||||/ \|||||||||||||||---
   1                       30          1             36  37            72

EISA/ISA/VLB
-----------------------------------------------
|            (component side)                 |
|                                             |
|   VLB   __ ISA-16bit __       ISA-8bit    __|
 |||||||||  |||||||||||  ||||||||||||||||||| A1(front)/B1(back)
             | | | | |    | | | | | | | | |   <-EISA
                   C1/D1                    E1(front)/F1(back)
                  G1/H1

PCI Universal Card 32/64 bit
 ----------------------------------------------------------------
|    PCI         Component Side (side B)                         |
|                                                                |
|                                                                |
|                                                optional        |
|    ____     mandatory 32-bit pins            64-bit pins  _____|
|___|    |||||||--|||||||||||||||||--|||||||--||||||||||||||
         ^     ^  ^               ^  ^     ^  ^            ^
       b01   b11  b14           b49  b52 b62  b63          b94

PCI 5V Card 32/64 bit
|                                                optional        |
|    ____     mandatory 32-bit pins            64-bit pins  _____|
|___|    ||||||||||||||||||||||||||--|||||||--||||||||||||||

PCI 3.3V Card 32/64 bit
|                                                optional        |
|    ____     mandatory 32-bit pins            64-bit pins  _____|
|___|    |||||||--||||||||||||||||||||||||||--||||||||||||||


RS-232#

Assuming you are want to connect a PC to RJ11 style programming serial port on a phone system. If this is true there is NO MODEM involved. All you are doing is connecting serial ports together. You need a correctly configured RJ45(or RJ11) to DB9 adapter and a length of straight through RJ11 phone cord (or patch cord you have cut and put a RJ11 on one end like you have done). You will plug one end of the phone cord into the serial port on the phone system and the other end into the RJ to DB adapter.

In such a system only 3 wires (lines) are used. TD (transmit data), RD (receive data) and GND (ground). TD and RD will most likely be on the center pins of the RJ to DB adapter and GRND will most likely be on the left pin when looking into the socket. If you connect your adapter and it does not work then reverse pins 2 and 3 on the DB9 (or RJ11) to swap TD and RD.

Straight Through#

DB9CoFnD25451104prDirectionDescription
3RdTD224BLOUTTransmit Data
2GrRD351wBLINReceive Data
7OrRTS424OROUTRequest to Send
8BrCTS577wBRINClear to Send
5BkGND735wGR-System Ground
1YlDCD866GRINCarrier Detect
4BuDTR2013wOROUTData Terminal Ready
6WhDSR688BRINData Set Ready
9-RI----INRing Indicator

Crossover#

DB9CoFnD25451104pr
2RdTD324BL
3GrRD251wBL
8OrRTS524OR
7BrCTS477wBR
5BkGND735wGR
-YlDCD-66GR
6BuDTR613wOR
1/4WhDSR8/2088BR

Notes#

  • We have seen 1/4 and/or 8/20 used in various cross-over cables.
  • Normally these appear to be wired Straight at the computer connector and crossed at peripheral connector, but not always.
  • 4 wire uses TD, RD, GRD & sometimes DCD
  • The Co column is the customary color for the signal type listed under Fn. The wire colors have been verified for AllenTel (and most other I have seen) RJxx to DBxx adapters.
  • Finally the columns 45 110 and 4pr are where these pins land on RJ45, 110 blocks and the colors of a 4pr cable.
  • The actual nomenclature of a D-sub connector used for serial connections on modern computers with 9 pins is a DE9. If you want to read more go here http://en.wikipedia.org/wiki/D-subminiature

More Information#

There might be more information for this subject on one of the following:

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« This page (revision-13) was last changed on 04-Aug-2016 16:22 by jim