The Facility codes in the access control IC card usually range from 1 to 255 in the standard 26-bit Wiegand format. However, the values and meanings of the Facility codes may vary for different access control systems and card formats:
Wiegand format
Standard 26-bit Wiegand format: This is a widely used industrial standard. In this format, the facility code (Facility codes) occupies 8 bits, the maximum facility code is 255, and each facility code can have a card ID number from 1 to 65,535, up to 65,535.
34-bit Wiegand format: The length and position of the facility code may vary. For example, some 34-bit formats may have an 8-bit facility code starting from Bit#2; while another 34-bit facility code may be 12-bit, starting from Bit#21.
Other formats
M1 card: The M1 card is a common access control IC card type. Its data structure does not directly correspond to the clear Facility codes field in the Wiegand format. The first 4 bytes of sector 0, block 0 are the card number, the 5th byte is the check bit, the 6th to 8th bytes are the card type, and the last 8 bits are the manufacturer code. The card's permission management and other functions are mainly achieved through the read and write control of sectors and blocks.
CPU card: CPU card has higher security and more complex instruction system and data structure. It is usually used in access control systems with extremely high security requirements. Its permission management is often achieved through internal operating systems and applications. Different from the traditional concept of Facility codes, it may involve more key management, identity authentication and other mechanisms.
Author: Written by Ms.Anna Zhang from S4A INDUSTRIAL CO., LIMITED
Factory Address:Building S4A, South Third Lane, Qiuyuling Street, Zhangkeng Village, Hengli Town, Dongguan City, Guangdong Province Office Address:#601,floor 6 ,building 1,JINFANGHUA industrial zone, Bantian St. Longgang Dist. Shenzhen, PRC.
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