Single Chip Microcomputer ,ttl Turn Rs485 Module, 485 Turn Uart Serial Port, Level Fers, Hardware Automatic Flow Control Only One In The Whole Network, 3.3v And 5.0v Power Supply, Rs485 Signal Perfectly Compatible With Automatic Flow Control Module. Has Rxd, Txd Signal Indicator Light, Monitor Send And Receive Status Using The Standard 2.54 Pitch Design, Easy Secondary Development. Colour:blue Material:metal Operating Temperature : -40 Degrees Celsius ~ + 85 Degrees Celsius. Size:42.8mm X 15.22mm X 0.8mm. Absolute Adopts Imported Chip, Industrial Design, Strong Anti-interference Ability, At The Same Time More Effective Lightning Protection Design, 485 Can Be Used In Industrial Field And Field Under The Harsh Environment. (using 850 Meters With 2 X 1.5 Cable To Do The Test, It Is Recommended To Be Used Within The 800 Meters, More Than 800 M, Please Add Extra Repeaters). Use Half Hole Process Design, Thickness Of 0.8 Mm, Can Be Used Easily As A Child Motherboard, Also Can Be Used Welding Terminals. With