The SCR-100 is an access control terminal that incorporates a proximity reader and supports up to 30,000 users and 50,000 log records. It connects to access control management software via Ethernet or RS-232/485 and can also operate independently by downloading data via USB. Key features include time zone and group management, anti-passback functions, web server access, USB data download, Wiegand input and output, and support for EM, Mifare, and HID card technologies.