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按推荐电路,RIDD用13K电阻时通信正常,用30K电阻后无法通信,是什么原因导致的。是不是更换电阻的同时也要更改STC的电容大小,他们之间有什么计算关系么,单负载和双负载的区别是什么,规格书上我找不到解决措施,麻烦讲解一下,谢谢