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Andrew has a good point there that causes lots of bother at times. The USB adaptors allocate the first available COMx and if you change the USB port a new number will be allocated each time reserving the previous one. Thus COM port numbers can easily be allocated beyond the range of the connected equipment.
As I use a lot of utilities that are compiled Basic. I can only use COM1 or COM2. This means that I always need to check the allocated COM port. If the is no physical COM port on the computer COM port COM1 will still be reserved and not used for the USB adaptor. However this port can still be used as COM1 for the USB adaptor by editing the com port allocations.
Barry
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