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请教一下 ＤＰ８３８４９ＩＦ的ＲＸ＿ＤＲＶ（接收数据准备好信号）异常，有那几种常见的原因引起的？
以太网的发送接收是对称的，很难出现是接收异常，发送正常。除非是传输距离很长，接近极限，对布板要求高。
如遇到问题，建议可以贴一下原理图，一起分析一下。短距离是否正常？
