Here is a comment from the code:
If the receiver is active then do not complete this read. The problem is that the Edgeport buffers the RX bytes and we poll the driver. If we do not receive any bytes in 200ms we may report an erroneous event even if there are available bytes in the Edgeport device or driver.
∙Test Ports - Perform a confidence test on the internal workings of the serial ports.
∙Power Management – Turn on and off the power for HubPorts with USB PlusPower ports
