can you give me a bit more as to what you are looking for?
ie. a command line for everything
specphoto pel on ; sleep 10 ; specphoto pel off
or a dos box menu driven interface;
or a gui
what does the port present itself as? a quick doc scan suggests that it is a com port, but I couldn't see what it was or missed the page.
what scripting languages/c-compile environments do you have available to use? e.g., Microsoft VisualC++, VB, MinGW, Cygwin, Windows Scripting Host, jscript, cscript, etc.
I would be against providing a compiled exe to you as you would have no idea what it was capable of. However source, with staged requests would be OK, as you can then follow and keep it going/get someone else to add or check.
also it appears that the following might also be required: Interfacing and Programming Guide for the HP8452A diode-array spectrophotometer
Most importantly a timeframe for each stage.