Blue connections on 9 pin female Null Modem
1 - 6 ok but no 4
7 - 8 no
Blue connections on 25 pin male Null modem
6 - 8 ok but 20 no
4 - 5 no
Blue connections on 9 pin female Full Hand shake
1 - 4 no but 1 - 6 ok
Blue connections on 25 pin female Full Hand shake
6 - 8 ok but no 20