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SR331是新乡三瑞电子技术有限公司精心研制的分时双工通信模块。它利用20mA电流环和光电隔离原理来实现上位机与多个下位机间的多机分时双工通信。因而具有极高的可靠性和下位机无数量限制的优点 ,从而解决了远距离多机通信时RS485芯片容易损坏的问题
SR331 is Xinxiang three Swiss Electronic Technology Co., Ltd. well-developed time-division duplex communication module. It uses 20mA current loop and optical isolation principle to achieve PC and multiple lower machine multi-machine time-division duplex communication. Which has the advantages of high reliability and unlimited number of lower-position machines, so as to solve the problem that the RS485 chip is easily damaged in long-distance multi-machine communication