Urgent! ! ! ! POS machine shows that PED has been tampered with! Please enter PWD, which cannot be used. What should I do?

This sentence tells the user that "the device is not used properly, please enter the password". Users are advised to refer to the operating instructions of the POS machine, check the improper use of the POS machine, and then enter the correct password.

POS is a multifunctional terminal. It can be installed in special merchants and acceptance outlets of credit cards, and connected with computers to realize automatic transfer of electronic funds. It has the functions of supporting consumption, pre-authorization, balance inquiry and transfer, and is safe, fast and reliable to use.

Extended data

Taboos for the use of POS machines

1. If you don't swipe your card at ordinary times, a swipe is a lot.

So the bank will suspect that you are in TX or that your card has been swiped.

2. The card is swiped too frequently in a short period of time, and swiped during non-business hours.

It is best to swipe your card between 9 am and 8 pm every day, and swipe the same card at least once every 30 minutes.

For merchants such as bars, KTV and hotels, it is not surprising to brush after 8 pm, but if you always brush a large sum of money at night, it is easy for banks to stare at it. Banks generally count transactions after 8 pm as the next day for risk control. If you need money badly, you must be prepared in advance.

3. use POS machines in different places.

Because most criminals who steal credit cards commit crimes in different places, bank risk control is very sensitive to credit cards in different places, especially when POS machines are used across provinces.

Phoenix. Matters needing attention in com-7 counting POS machines. Did you use them correctly?

Baidu encyclopedia -POS machine