attila

During device opening internal chips are enabled and configured. This results in consumption increases, specially when the 100 MHz clock (PLL) is started. The needed current increases from 100mA to 500mA. In case the USB can't provide enough current the voltage drops below the minimal required for the device to operate and communication fails.
 
In case you get “Device configuration failed (PLL 1)" or "Communication with the device failed.” error message:
The device needs at least 2W/400mA from USB cable. To satisfy this:
- Try to use different USB cable and computer plug.
- Use the USB plug on the back of the PC, not the one on the front panel.
- Use short cable, do not use long cable or cable extender.
- Use powered USB-hub, avoid un-powered hub.
- Use USB-Y cable to load power from two plugs.
 
Device not detected by WaveForms:
Open Windows Device Manager then connect the device and wait up to one minute for a device to appear:
 - USB Serial Converter, with warning
- Connect the device directly to the computer's USB plug without using external hub.
- Restart the computer.
- Reinstall WaveForms, including the Adept Runtime section.
 - USB Serial Converter, without warning
- Restart the computer.
- Reinstall WaveForms, including the Adept Runtime section.
- Other application might have erased the USB controller EEPROM (FT_Prog, programming cable drivers...)
 Use the "My device is not listed" button in WaveForms application Device Manager to reprogram the EEPROM.
 - Unknown Device
    Check the Hardware IDs under device Properties, Details tab
- USBVID_0403&PID_6014
  The USB driver is not installed.
- Restart the computer.
- Reinstall WaveForms, including the Adept Runtime section.
- USBVID_0000&PID_0000
  Device not identified or malfunction. See "Nothing shows up".
 - Nothing shows up:
- Connect the device directly to the computer's USB plug without using external hub.
- Try to use different USB cable and computer plug.
   The device or its plug might be damaged.