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Serial Cable Pinouts

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 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.1221401243.txt.gz · Last modified: 2008/09/14 10:07 by faith
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