Which protocol is the standard data protocol for most proximity type cards?

The Wiegand protocol is the standard data protocol used for most proximity type cards. This protocol was developed for communication between access control devices, such as card readers and control panels. It is specifically designed to transmit data in a secure and efficient manner, allowing for the transfer of identification information from the card to the reader. The format typically consists of a series of binary bits that represent the card's unique identification number, facilitating smooth interaction in access control systems.

Wiegand is suitable for proximity cards due to its simplicity and low cost, making it a popular choice in many access control applications. It operates over a relatively short distance, which is appropriate for the close-range scanning needed with proximity cards, ensuring a practical implementation in real-world scenarios. The protocol's widespread acceptance and implementation across different manufacturers further solidifies its status as a standard in the industry.