Convert RS232 into RS485 signal, Port-powered, Support 2500V isolation, no power supply needed. 1, Plug and ... play, small volume, easy installation 2, Port-powered, high efficiency obtain electricity, can also worked on 3 lines ... Working temperature: -40 to 80°CStorage temperature: -40 to 85°CHumidity: Relative humidity 5% to 95% Input powered: No power supply needed, powered ...