CYPRESS SIO-7100 Reader Extender Reader interface
Cypress Computer Systems SIO-7100 Serial Interface Module RS-485 - Allows one reader and associated door/gate hardware to be located up to 10000 feet away from a RS-485 controller using the SIO protocol. Requires 8 - 16 VDC. Durable aluminum housing. Overall dimensions of unit: 4.50" x 2.90" x 1.00" (approx).