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调试的时候,DB9插头是不是必须通过7,2号端子供24V电?主板通过USB联接电脑的时候有没有向RS485扩展板供电?
主板通过USB联接电脑的时候有向RS485扩展板供电。
资料:https://singtown.com/product/50775/openmv-rs485-shield/