DMM6500 streaming digitized data to computer via python + TSP code

I'm following Keithley/Tektronic the application note "Data Logging of Power Profiles from Wireless IoT and Other Low-Power Devices". Link here: https://download.tek.com/document/1KW-61357-0_DMM6500_Datalogging_Application_Note_080318.pdf
Only change I made is to measure digitized voltage instead of current.
The script run without a hitch but the data file doesn't match the actual measurement. The data file contains just integer between 0 & 252, while the buffer reading reads the correct current/voltage values.
What could be causing this problem?

Ref attached PNG for above post

Yes, I have the code from Appendix A and the functions.lua file with code from Appendix B. 
I did change in B the line:

dmm.digitize.func = dmm.FUNC_DIGITIZE_CURRENT

to 

dmm.digitize.func = dmm.FUNC_DIGITIZE_VOLTAGE

so I can measure voltage instead of current.

And also use the same formats "{0:.4e}"
When I try to debug, I found that the byte-type variable I receive back from "get_block(s)" is a list of integer instead of floats.
 

The appendix B code is configuring the instrument to use binary data format (format.data = format.REAL32).<br> Compared to ASCII, this allows fewer characters on the bus for better throughput.<br> <br> To interpret the data, checkout some IEEE754 compliant techniques.<br> I think numpy and fromfile might be useful.