FoxDelta supplies a null modem adapter with their FoxTrak tracker. The null modem is used only during configuration.
The adapter is supplied with hex pillars (jack screws) on both DE9 connectors, which prevents the adapter being plugged directly onto the FoxTrak, or onto a PC USB-RS232 adapter with pillars.
Above is a picture of a modified adapter, the hex pillars (pictured on top of the FoxTrak) have been removed and replaced with 1/2″ 4-40 UNC screws with a low profile socket head which allows direct connection of the PC adapter to the null modem adapter and in turn to the FoxTrak.
Why don't they ship them with these screws?