Galaxy, No serial communication, Prolific or Moxa adapter/port locked up

Potential Symptoms

  • Unable to get status to the display.
  • Venus is set to connect to the correct COM Port.
  • TX LED may be lit solid Red on the signal converter or J-box, or there are no blinking TX or RX lights on the J-box when trying to connect or send content.
  • Communication window pops up and disappears right away when attempting to get status.
  • In Venus version 3, the display name turns red and the error log shows error code -12 "Unable to Open Communications Port".
  • In Venus version 3, when running a loopback on the DB9 end of the USB to serial adaptor the response is "Connection Failure" or "No Response".
  • Venus 1500 v4 alert: unable to connect to the display or No Response.
  • Device Manager may recognize the adapter, and may report problems installing the driver or will not install the driver at all.
  • Device Manager might show "this device is working properly".
  • A loopback test on USB to serial adaptor fails.

Environment

  • Product: Galaxy, Serial Communication
  • Component: USB to serial adapter (Prolific/Moxa)
  • Control System: Venus 1500 V3 or V4

Cause

  • USB Adapter is not working / locked up.

Resolution

  • Reseat the Adapter: Unplug the USB adaptor from the USB port on the computer for 30 seconds then plug back into same port.
    • May also be accomplished by disabling the adapter then re-enabling it in Device Manager.

KB ID: DD2112087


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