I need to convert the GPIB to USB using NI-488.2 from national instrument and I need to create a software complete with GUI using python. The old machine that my company use for measuring is Model 273A potentiostat/galvanostat from Princeton Applied Research. Im using windows 7 and python 2.7 using wxpython. And I need to program using python. I just need to send simple command for example R to run the machine.
Connections : from measuring machine via GPIB to NI-488.2(a card to convert GPIB to usb)
              from NI-488.2 to pc via usb
The questions are :

How can I send any command to the machine? From what I know, I need to send it to the driver of the NI-488.2. Is it correct? (if correct see ques. 2 if not jump to ques. 3)
How can I send from my own code using python to the NI-488.2 driver?
How to see the code of any driver? But in my case the driver for NI-488.2. (the driver can be downloaded for free in the national instrument website but registration needed)
Install the necessary drivers, probably NI 488.2 and NI Visa. Then use pyvisa, a python wrapper around visa, to talk to the device.
converting GPIB to USB using NI-488.2