Select Certain Cells within Range

Hi Again,

For this to work, it needs to be connected to a data terminal which I only have at work.

Eitherway, attached is a simplified version of this spreadsheet.

Cell A3 sums all the cells that data is to appear in.
And the VBA code is to keep looping to force data to download until either it does or the data terminal displays an error value.

Thanks for your help

Tejay