(1) 3.3V and 5.0V power perfect compatibility (2) 3.3V and 5.0V signal perfect compatibility (3) the absolute adopts imported chip,industrial design,strong anti-interference ability,at the same time,adopt more effective lightning protection design,485 can be used in industrial field and field under the harsh environment,the working temperature of 40 to + 85,the transmission distance of km (with 850 m 2 * 1.5 cable testing,suggest use within 800 meters,more than 800 meters please add repeater) (4) the half hole process design,plate thickness 0.8mm,can be easily as composite plate,can also be used for welding terminal (5) has the RXD,TXD signal indicator lights,send and receive status panoramic view