In this context, PED is an acronym for Pin Entry Device. The PED handles sensitive cardholder data (including PIN numbers), among other functions crucial to your PAX S920. If you receive an error code indicating “PED tampered,” it suggests that your device may have been damaged or otherwise compromised. The issue could stem from something as straightforward as a depleted battery, though it is occasionally more serious. If you encounter this error code, refrain from solving the issue independently. Instead, contact PAX support or consider replacing your device.