Do you have a Serial Cable that needs converting to a Null cable? Instead of replacing your cable you can use this handy adapter to convert it to a female Null connection. Null cables only have 8 pins connected and so the 9th pin is not required.
Male to female mini null modem adaptor Connections: 1+6-4 2-3 3-2 4-1+6 5-5 7-8 8-7
