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说明书中说J7接口有4个引脚，但相机上用于触发的接口只是一根同轴电缆，中心为正，同心环为地线，该怎么和J7口的四个引脚相连呢，如果是选两个引脚，那么是哪两个呢？
J7四个脚定义是VCC,GND,同步输入触发,和输出触发.连接方式参考文档资料:Using the DLP LightCrafter™ to trigger CCD cameras from Imaging Source
http://www.ti.com/product/DLPC300/technicaldocuments
DLP4500的能给个链接吗 trigger CCD cameras from Imaging Source
http://www.ti.com/lit/pdf/dlpa036
