The Wiegand protocol is an internationally uniform standard and is a communication protocol developed by Motorola. It is suitable for many features of card readers and cards involving access control systems. It comes in many formats, and the standard 26-bit should be the most common format. In addition, there are 34-bit, 37-bit and other formats. The standard 26-bit format is an open format, which means that anyone can purchase a HID card in a particular format, and the types of these specific formats are publicly available. The 26-Bit format is a widely used industry standard and is open to all HID users. Almost all access control systems accept the standard 26-Bit format.
The meaning of the format is as follows: When the string number 028-(88888888) is given, the user does not know the meaning of the string number, but if this is an electric hua number ma, then you may say: Oh, 028 is the area code of Chengdu, and 88888888 is the electric hua number ma, yes, this is the service line of Sichuan Airlines. But the security industry is not willing to disclose these formats, and security companies often change these formats to ensure product confidentiality. 
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