If you have the Dometic power awning, there is a users guide in the library with instructions on how to roll up the awning in case of power failure. You can download it here:
Forest River Forums - Downloads - Awning - Dometic Power
In Case Of Coach Power Failure Or To Manually
Important: This procedure will require two people. When this procedure has been performed, the awning must be serviced by a Dometic Service Center or a qualified service technician before using again.
1. Slide the pull strap (provided) into the utility slot of the FRTA.
2. While one person is holding onto the pull strap, remove the screw in the top of the right top casting.
The FRTA will immediately roll in once the bolt is removed. Walk the awning to the closed position.
3. Align hole where screw was removed and replace screw into top casting to secure awning.