Aviom Pro64 Network Manager - Manual (Page 148)

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64 N
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Wiring a DB9 Crossover Cable
The following table can be used to create a null modem (crossover) cable:
Crossover Cable
Pin # Pin #
1 and 6 4
2 3
3 2
4 1 and 6
5 5
7 8
8 7
Pin 9 ‑ no connect