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Hi Graeme,
Here are some tips to help you.
When you plug your Serial to USB adapter into a USB port on a Windows computer, Windows will automatically assign a COM port number to it. At this stage, your device software does not know what this COM port is. You have to go into 'device manager' in Windows, and under "Ports' look and see what COM port has been assigned to your Serial to USB adapter. Once you know this COM port number from the device manager, then you can put the COM port number in your device software and all should work.
Do this for each adapter you have.
By the way, if you unplug one of your serial to USB adapters that has been working, and plug it into a different USB socket, (even a different socket on the hub), it will get a different COM port number and you will have to go back into your device software and change it.
Cheers,
Damien.
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