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