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长虹LDTV47866U(LS19机芯)液晶彩电维修手册和培训资料文件下载
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多少?为了估计总线负载的最大数量,RS-485指定一个假设的单位负载(UL)项,它表示负载阻抗约为12KΩ。电信行业协会/电子工业联盟(TIA/EIA)的RS-485标准规定最多可将32 ULS添加到RS-485
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