7941E RFID 125KHZ Embedded ID Module EM4100 TK4100 wiegand/Uart

0	00111101	00010010	11010110	1
Parity check	3D	12	D6	Odd check

wg34

0	01101011	00111101	00010010	11010110	0
Parity check	6B	3D	12	D6	Odd check

 

UART interface
Data head	length	Card type	card number	BCC calibration	The number of ends
0x02	0x09	0x01	SN0-SN3	(XOR of all data Exclude header data and Tail data )	0x03

Card types are:
0x02 EM4100

For example: The data received by the serial port tool is 02 0A 02 2E 00 B6 D7 B5 F2 03

The first byte 0x02 indicates that the data starts.
The second byte, 0x0A, indicates that the entire data length is 10 bytes, including data start and end of data.

The third byte 0x02 indicates that the card type is EM4100.
The fourth byte to the 8th byte 0x2E 0x00 0xB6 0xD7 0xB5 The five bytes represent the read number, where the fourth byte 0x2E is the hidden card number.
The 9th byte 0xF2 represents the BCC check for the second byte to the eighth byte.
The tenth byte 0x03 indicates that the data ends.
Precautions
1, please stay away from the interference source, strong interference signal may affect the reader.
2, the choice of linear power supply can significantly improve the reading distance and the effect of switching power supply on the reading distance has a certain attenuation. but
Does not affect the normal and stable work
3, the module 9 ~ 12V range can work properly, remember that you can not use a higher voltage
4, the block itself will occur high-frequency signal, the analog circuit may have some interference