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How to use ESL tag -- FAQ

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  • Time of issue:2020-06-29 16:45
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(Summary description)

How to use ESL tag -- FAQ

(Summary description)

  • Categories:FAQ
  • Author:
  • Origin:
  • Time of issue:2020-06-29 16:45
  • Views:
Information

 

Q: Do you have more information about Bluetooth-communication between Access Processor and ESL Tag? Which standard is used?   
A: BLE4.0

Q: Which frequencies?
A: 2.4G

Q: Do you have any documents that use in Europe is allowed?

A: We're applying for the CE approval, and will get the certification in September.

Q: Is communication between Access Processor and ESL Tag protected/save?
A: Yes, it is protected.

Q: How can we avoid unauthorized access to the system?
A: The communication is encrypted by AES(Advanced Encryption Standard)

Q: You told me, that lifetime of ESL Tag is between 5 and 10 years. Can you also tell me the max. number of refreshes? In my opinion this value is better to calculate.
A: Yes, this value is worked out by calculation, as 4 time refresh per day and waked up once very 20 seconds.
   Standby current: 0.001mA
   Waked up peck current:10mA
   Refreshed peak current:20mA
   The aboved values can be measured
   A common CR2450 Electric quantity is 620mAh
So we can get the electric quantity for one hour
   Standby electric quantity:0.001x1=0.001 mAh
   Waked up electric quantity:3600/20x10x0.01/3600=0.005 mAh (as peak value)
   Refreshed  electric quantity:20x0.3x4/3600=0.0067 mAh (as peak value)
   The shortest lifetime of ESL tag is 620/(0.001+0.005+0.0067)/24/365=5.573 years
In fact, most ESL tags can't reach 4 time refresh per day, so we said that lifetime of ESL Tag is between 5 and 10 years.

Q: Am I right, that POE is possible for Power supply of Access Processor?
A: Yes, you are right, our current Access processor just support POE power supply, our engineer considered this one.

 

 

 

 

 

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