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ISO3082作为485数据接收问题

Other Parts Discussed in Thread: ISO3082

DE和RE短接,为高电平时,对PC发送数据,能正常接收。

但是DE和RE短接,为低电平时,PC对其发数据,无法接收。

单独测试串口正常,接上ISO3082就不行。

有什么排查方向吗?