Product Features: Input And Output Power Supply. Support Rs485 Bus Rate 0-500kbps, Parent Mission, Rate Adaptation. Support Point-to-point, Star, Cascade Topology. With Power Indicator Light, Data Mission Indicator Light. With Electrostatic Protection, -protection, Self-recovery Diode And Other Features. Din35mm Industrial Rail Installation There Is A 120 Ohm Terminal Resistance Switch At The Output End, Which Can Be According To Needs, Which Is Convenient And Fast Specifications Comply With Rs485 Protocol Standards Automatically Send And Receive Data, Electrical Isolation Input Interface: 1 Rs485 Interface Output Interface: 2 (internal Parallel) Rs485 Interfaces Communication Rate: 0-500kbps Rate Adaptive Working Power Supply: Dc9-36v 200ma, Internal Two-way Isolated Power Supply Communication Distance: 2000 Meters (9.6kbps), 1500 Meters (19.2kbps), 800 Meters (187.5kbps), 200 Meters (500kbps) Isolation Protection: Power Reverse Connection Protection, Self-recovery Overcurrent Protection, Rs485 Esd