DC-POWERBUS enable you to send data/information over DC power line ,so user can communicate and power-up field devices using only two wires . powerbus provides more flexibility in system and offers a cost-effective communication media for a wide range of applications in the environments that might be too expensive to network. powerbus is robust system architecture that ensure data reliability and noise interference. users can replace RS-485 ( 2 data lines+2 power lines) communication system with POWERBUS (2-wires) without any extra work ,powerbus system is less vulnerable to noise ,and provides flexibility in the system. users can connect field devices (up to 256) in any network topology (mesh, star, tree etc ). powerbus is cost effective, users friendly and easy to install. POWERBUS is a new non-polarized (RS-485 polarity A,B) 2-wire communication system, topology free ( tree,star ,daisy-chain,mesh) .