linux:serial [alephnull.com]

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====== Cable Pinouts ======

===== Ethernet =====

The house ethernet standard is T568B:

^ RJ45 Pin ^ Color        ^ Pair ^
^ 1        | White/orange | 2 |
^ 2        | Orange       | 2 |
^ 3        | White/Green  | 3 |
^ 4        | Blue         | 1 |
^ 5        | White/Blue   | 1 |
^ 6        | Green        | 3 |
^ 7        | White/Brown  | 4 |
^ 8        | Brown        | 4 |

===== Serial =====


==== NULL ====

This mapping is the same for male and female connectors.

^ DB9 Pin ^ DTE Function ^ Adapter Color  ^ RJ45 Pin ^ 
^ 1       | CD           |        |   |
^ 2       | Rx           | Yellow | 6 |
^ 3       | Tx           | Green  | 5 |
^ 4       | DTR          | Blue   | 1 |
^ 5       | GND          | Red    | 4 |
^ 6       | DSR          | Black  | 3 |
^ 7       | RTS          | Brown  | 7 |
^ 8       | CTS          | Gray   | 8 |
^ 9       | RI           |        |   |
^         |              | Orange | 2 |

^ DB25 Pin ^ PM Function ^ Adapter Color  ^ RJ45 Pin ^ 
^ 2       | Tx           | Green  | 5 |
^ 3       | Rx           | Yellow | 6 |
^ 4       | RTS          | Brown  | 7 |
^ 5       | CTS          | Gray   | 8 |
^ 6       | DSR          | Black  | 3 |
^ 7       | GND          | Red    | 4 |
^ 20      | DTR          | Blue   | 1 |
^         |              | Orange | 2 |

==== STD (Straight-Through) ====

^ DB25 Pin ^ Adapter Color ^
^ 2        | Yellow |
^ 3        | Green  | 
^ 4        | Gray   |
^ 5        | Brown  |
^ 6        | Blue   |
^ 7        | Red    |
^ 20       | Black  |
^          | Orange |

==== INTEL ====

There are two standards for IDC-to-DB9, one is the standard straight-through method, mapping pin n on the IDC to pin n on the DB-9.  The other is "Intel" format, which does a completely daft mapping.  This is explained [[http://www.scantips.com/serial-db9.html | here]].

You can detect this by measuring the voltage between pin 5 and pins 2 and 3, one of which should be positive and one negative.  In the Intel configuration, pin 5 isn't ground, and the voltage on pins 2 and 3 will have the same sign.

^ DB9 Pin ^ Color ^
^ 1       | |
^ 2       | Green |
^ 3       | Red   |
^ 4       | Brown |
^ 5       | |
^ 6       | Yellow |
^ 7       | Blue   |
^ 8       | Black  |
^ 9       | Gray   |

linux/serial.txt · Last modified: 2008/09/14 10:56 by faith

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