Whenever I reset the device the COM port effectively disappears from the system, even though it may be "open" by these utilities. When the device is restarted the COM port re-appears in Device Manager, as expected. However, neither Free Serial Port Monitor or Realterm can find it. My suspicion is that the port is somehow locked.
I need a tool for observing any locks on COM ports and a way of unlocking the port, short of rebooting the computer, which I've been doing (very time consuming). Does such a utility exist?