How to adjust the contrast of the proface touch screen GP2500-SC41-24V

What programming software does GP2501-TC11 use? How can the official website not have this model?

GP2500L series touch screen PFXGP4501TMA, connected to the computer download program, shows no response to GP, using a USB turn round, eight pin socket.
Now the screen is pressing, there is no sound, consult the great God to guide the chant

Ask GP2500-TC41-24V how to calibrate the touch screen