我们用USB-RS485模块测试28377的485通信。当通信速率为1M以下时候,通信正常;通信速率为2.5M就不正常了。两个USB-RS485模块相互通信,2.5M到3M都是正常的;用示波器看差分电平波形也感觉是对的,但为什么电脑收不到数据,请指点!28377外扩的485芯片是用的sn65hvd78.
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