2.25 How do I make loop-back plugs?
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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