What is the difference between a direct serial cable and a cross serial cable?
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Should I Use Null Modem or Straight Through Serial Cables? - NI
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Serial Port and Modem Cables
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Crossover or "Null Modem" vs. Straight Through Serial Cable - Decisive Tactics, Inc.
ATEN Global Service Site
Null modem - Wikipedia
What is null modem? Null Modem cable vs Straight serial cable
