2812的SCI接RS485电平转换芯片MAX3082,2812发送数据出来电脑串口助手能收到,但是电脑串口发送出来后,差分信号就只有单边电平了,取掉板子与电脑的通信线,测量插在电脑串口上的转换器,又是差分信号,请问大侠们,这是个神马情况,没头绪了
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