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如何使用报警器?



平台DM8168,dvrrdk3.0; 我把报警器接到开发板的ALARM口1和地,外接一个12V电源,运行gui程序后出现带有qt界面的视频,我设置如下图:

我把图右边的motion,sensor和videoloss里的所有x变成了o,把DIO里的ARARM EABLE设置为enable, ARARM TYPE设置为NO或者NC都没有报警,是怎么回事?
1.怎么启动报警呢?
2.sensor , motion和videoloss这三种分别在什么情况启动报警呢?
3.ARARM TYPE:NO,NC是什么作用?