The Stoneuk ST-SBOARD3 is a compact yet powerful access controller designed to support a wide range of authentication methods and seamless system integration. It features multiple access modes, including card, PIN, card with PIN, and multi-card/PIN combinations, offering flexible security options for various environments. This controller is compatible with all readers that output Wiegand 26 to 37 bits, as well as keypad readers with 4-bit, 8-bit (ASCII), or 10-bit virtual number formats. It supports advanced access features such as MasterCard and Principal Card functions for simplified and hierarchical access management.