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在设计LIN卡的时候,所有电源都内部提供(包括LIN的12V电源),但看资料不确定这个DB9接口的12V是做什么用的,是外部提供给板内做电源用,还是我板内输出给外部或者仿真器用,麻烦各位大神不吝赐教。