Sorry, there is no function for unattended read in the PCS10/K8047. You can just start the autosave manually.
One alternative is to use the DLL and write an application that starts at the scheduled time to read the data from the PCS10/K8047 and saves it to a text file.
Is there a Vellemn product (software/hardware) which is suitable for this task, or some further advice as to where we could search for a software solution for the PCS10?