Depending on the EMV device, the standard password will vary.
On semi integrated devices, such as the S300, usually, the password on a pax is today's date, in the format MMDDYYYY
But if there was a custom password set on the device or the date on the device is wrong because the machine was off for a long time, it might be different so try the passwords below.
On the integrated devices, such as the A920, E600, etc passwords are used to access the device settings. The following are the standard passwords used by Pax
Possible Password List :
9876 (usually the standard password)
Date (long format mmddyyyy)