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485串口通讯只能发送不能接收。。。。。



我用GIO88号引脚作为控制输入输出引脚,目前的问题是只能发送不能接收,我已经测出是GIO88号引脚没有使能控制,请问我需要修改什么地方才能使在发送的时候GIO88输出高,接收的时候输出低。或者有更方便的方法在应用程序中控制。