Hi Larry,
Can you say more about it?
From this little bit, there is an arbitrary binary file that you would like parsed into information to send out to specific modbus points? We solved a similar problem somewhat recently, but we wrote a module for that client that included handling for the file and providing a place to upload it. Without a module like that, there is not a clear way to do what I think you're asking in 2.8. I was inspired to add a Binary type to the Data File data source from this question, though. The data file module has an endpoint in 3.0 to POST a file to and import it immediately, and that sounds like what you're looking for. We're working hard to get 3.0 releases happening soon.
You may have other options, though, such as setting an alphanumeric point to some representation of the file and parsing it out of the alphanumeric point, but it doesn't seem so straightforward.
