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This is an old revision of the document!
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 |