3. MCU reads ID card (EM4100 data format)-EEWORLD

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1. EM4100 data format

insert image description here

Now let us explain.

(1) The first line contains 9 “1s”, which is the fixed format of EM4100.

(2) The following D00~D03 is the first ID number. P0 represents the even parity of the first row (e.g. 0000_0/0001_1/0110_0). When it is not an even number, the even parity is set to 1. P0-P9 are the even parity of the first four bits of each row.

(3) PC0~PC3 are the even parity of each column (P0-P9), (e.g.: 0000000110_0)

(5) For example: the card number is 06001259E3

insert image description here

(After completing the microcontroller card reading, we will use the microcontroller to simulate the ID card and will use this data format to send the card number)

2. Manchester encoding

In order to read the card and simulate the ID card with the microcontroller, we need to understand the working method of Manchester Encoding. Let's take a look at the following figure

insert image description here

Mainly observe the four states in the above figure: 11, 10, 01, 00

(III) References

http://bbs.mydigit.cn/read.php?tid=1536395

http://www.priority1design.com.au/em4100_protocol.html

https://blog.csdn.net/TonnyBrown/article/details/75200601#commentsedit

Keywords：MCU Reference address：3. MCU reads ID card (EM4100 data format)

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