Aviom 6416dio - Manual (Page 87)

77 rs-232/422
Creating Custom Cables
The following table showing the connections for a null modem DB9 to DB9
crossover cable can be used when making your own cable.
RS‑232 Null Modem Cable Wiring for a DB9 to DB9 Crossover Cable
Pin Signal Direction Pin
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
9 9
Shield Soldered to DB9 Metal on Both Connectors
RS-232 requires a null modem cable wired as a crossover cable. RS-422 uses
a straight-through cable. This table shows the pinout for RS-232 crossover
cable wiring and can be used when creating a custom cable. Note that pins 1
and 6 are tied together on both sides of a crossover cable.