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DB9 to DB9 Crossover Pinout

Written by Michael Cone

Updated at January 26th, 2026

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This is the wiring for a D9 crossover.

 

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  • Cable Spec 1 - RJ-45 to DB9 Female - "ST" or Straight Through adapter for all applications except for the CB-EL1 board
  • Cable Spec 2 - RJ-45 to DB 9 Female - "CO" or Cross Over adapter for all applications except for the CB-EL1 board
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