Description

This article is from the alt.comp.hardware.homebuilt Frequently Asked Questions. It is maintained by Mark Sokos (msokos1@gl.umbc.edu) with many contributions from others.

2.25 How do I make loop-back plugs?

Norton Diagnostics uses these:

9 Pin Serial - DB9S Connector (Female)

 2 3 7 8 1 4 6 9
 |__| |__| |__|__|__|
 

25 Pin Serial - DB25S Connector (Female)

 2 3 4 5 6 8 20 22
 |__| |__| |__|__|__|
 

25 Pin Parallel - DB25P Connector (Male)

 2 15 3 13 4 12 5 10 6 11
 |__| |__| |__| |__| |__|

http://www.airborn.com.au/rs232.html --Schematic diagrams showing how to wire up RS232 connectors with handshaking and without, loopback plugs and null modem

 

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