Download here for Functional List, Dimension, Technical Specification, and Model Selection. DOWNLOAD S-series ControllerModel: S20 Features; Two Doors Controller, Two Door Sensors and Two Exit Push Buttons. Standalone Operation or Direct Connection to PC via TCP/IP. Store up to 100,000 cards and 100,000 offline transactions. Supports “Toggle Mode”. Supports Local Anti-passback. Built-in Watchdog to prevent the system from locking up. CE Certified.