- PABX -> PC
2 -> 2
20-+--> 6
5 -+
8 -+
7 -> 5
9 pin:
- PABX -> PC
3 -> 2
4 -> 6
5 -> 5
25 pin:
- By default the 9-pin port is set for output,
when using the 25-pin make sure the second com is set for output.
PABX -> PC
2 - 3
3 - 2
4-+
5-+
6 -+
8 -+
20-+
7 - 5 (earth)