Title: Hardware Installation Guide.pdf
revision 6 — 527LNL-500B Biometric Reader Interfacelonger than 4000 feet (1219 m), 100 ohms maximum (Belden 9842 4-wire or 9841 2-wire, plenum cabling Belden 88102, West Penn, or equivalent.) The drop cables (to readers and other devices) should be kept as short as possible, no longer than 10 feet.RS-485 CommunicationsThe (EIA) Electronic Industries Association standard defines RS-485 as an electrical interface for multiport communications on a bus transmission line. It allows for high-speed data transfer over extended distance (4000 feet, 1219 m). The RS-485 interface uses a balance of differential transmitter/receiver to reject common mode noise. For increased reliability over the extended distances End-of-line (EOL) termination is required.Belden (24 gauge wire – (7x32) Stranded Conductors – Polyethylene Insulated).Belden Wire SpecificationsTrade Number UL NEC Type CSA CertificationNumber of PairsNominal D.C. R. ConductorShieldNominal Impedance (Ohms)Nominal CapacitancepF/feet