Keithley 6517A With Arduino

Hi all ..
how to communicate Arduino to Keithley, where the Arduino also has to control data from the 16ch relay module
So the rules are:
A Keithley 6517A electrometer reads the sensor from the 16 Channel relay then the data is taken
to the Arduino and the Arduino will display it to C#

Does C# run on Arduino?  Or is there also a Windows computer involved that is running C#?

You 6517A can be command controlled over RS-232 or GPIB.

I'd suggest the C# program will control the Arduino/16channel relay module to routing signal to the 6517A.
Then C# can also obtain a reading from 6517A.

Will the 6517A measure current or voltage or ?