I think Its from the Upgrade thread a few days ago. Instead of hijacking the thread a new one was started which is this one. Same person (Georgia).
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I vaguely remember there is a command structure issue between the USB and Power Pro. The USB interface does not have the commands needed
to send the AIU info. SO the COmmand Station never see the AIU. This required the usage of the Serial Port.
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Can't say 100% but it caused me to stop dealing with the AIU. It was too much trouble. Not sure if it is the case but keep it in mind.
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Hopefully, someone will chime in and verify that it works or not.
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Inobu