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The entrance examination equipment is normal, but can not open the door, how to do it?

The entrance examination equipment is normal, but can not open the door, how to do it?  

1. Confirm that the card information has been stored on the equipment or the card has been invalid (the card opening time limit, the limited period is over, etc.) 


2. If the equipment has a "short drop", check the following questions 

(1) check whether the line is correct. 

(2) if the lock is connected to the access control, while credit card directly with a multimeter to check whether the 12V lock lock connection port voltage, some words are not just lock failure, access control attendance management software fault. 

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(3) if the lock is connected to the access control on the power supply, check card, power relay is working (credit card will have a "tower" sound) is not a power failure or access control attendance controller fault (use a multimeter to check whether there is a 12V connection port access control lock unlock voltage is no access control management software fault). Access control and power failure and multimeter to check whether there is a 12V connection port lock lock lock fault voltage, some words are.