Adb can't find my device

I was developing an android application from Eclipse, connecting my Acer ICONIATAB A 500, with Android 3.0.1. And I did not have any problem.

Now I'm trying to developing the same application on Acer ICONIATAB A 501, with Android 3.2 and my ADB can't find the new device, while Windows can find it! I set in my tablet Debug USB option active, and I installed the appropriate driver on Windows. I installed even the last Google USB driver (Rev. 7)

I tried to list the device find form adb with command

 adb devices

from command line, but List of devices attached is empty.

What can i do?

Solution

execute these line

adb kill-server
adb start-server

if it is mobile device check that in settings, developers options , debugging mode is checked or not