The Cypress Suprex SPX-7500 is a 2-wire RS-485 Reader Extender that connects a reader and its door or gate hardware up to 4,000 ft. from any Wiegand access control panel. It also supervises the connection, and can support up to 8 readers when used with Cypress EXP-2000 Expansion Pairs. Includes both remote and central units. Recommended for elevators, factories and sites with electrical noise, and reader installations exceeding the 500 ft. Wiegand limit.