Ok, cool.
So the thing to do then would be to use a comm handle to the file area and write your data to a file as often as you need.
You get to construct the file any way you like, so you can have a ‘timestamp,data’ format if you like.
There are some sample code on the forums to do this.
Here is one example; Convert Integer 32 to Timestamp String - #2 by mstjohn
Here is another; Requesting Code Sample - Writing to Text file in OptoScript
Lets know if you need any assistance to get the file created.