Drivers or protocol for the DX-5 Digital Control System

I am looking for drivers or the communication protocol for the DX-5 digital control system by Unit Instruments.

Here is what it looks like:

https://www.youtube.com/watch?v=1s3IuFXJAr0

I found a manual here:

https://www.artisantg.com/info/PDF__556E69745F44585F355F4D616E75616C.pdf

and a brochure here:

http://linportfolio.com/2007/sites/celerity/support/product_literature/power_control_software/DX5_RevA.pdf

The brochure specifically mentions LabVIEW and the manual mentions that it can be remotely controlled, but it doesn't list a command set for RS-232 communications. As far as I can tell, Unit Instruments is not around anymore.

Has anyone ever used one of these before?

Thanks,