Title: Hardware Installation Guide.pdf
The (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/feetpF/meter9841124.0 ohms/M3.35 ohms/M12012.842NEC CM CSA78.7 ohms/ km11.0 ohms/K9842224.0 ohms/M2.2 ohms/M12012.842NEC CM CSA78.7 ohms/ km7.2 ohms/K88102224.0 ohms/M15.5 ohms/M10012.9542NEC CMP CSA78.7 ohms/ km50.9 ohms/kmUpstream Host Communication Wiring (Port 1)