Just out of curiosity I wanted to see how deep a vacuum I could reach with just the ion gauge connected to the pump.
I tested the pump’s bake-out heater:
I let the pump and heater run all afternoon and I got as low as 25 nano torr:
It was still dropping slowly when I finished.
I also played around with the Hornet’s RS485 digital interface and Labview, but didn’t get too far.