Link Serial Cable DB 9 «=» DB 9

-------------
\ 5 4 3 2 1 /     (Female)
 \ 9 8 7 6 /
  ---------

-------------
\ 5 4 3 2 1 /     (Female)
 \ 9 8 7 6 /
  ---------


DB-9         DB-9

  2 ---------- 3
  3 ---------- 2
  4 ---------- 6
  5 ---------- 5
  6 ---------- 4
  7 ---------- 8
  8 ---------- 7

Note:
Occasionally, we must short pins 1 and 8 
of the connector on both ends of the cable.

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