Before DMX512, most manufacturers had their own dimmer control protocol that were proprietary and incompatible with other manufacturers' equipment.
在DMX512推出之前，大多数厂家都有各自专用的调光控制协议，但是不同厂家的设备之间互不兼容。
Before DMX512, most manufacturers had their own dimmer control protocol that were proprietary and incompatible with other manufacturers' equipment.
在DMX512推出之前，大多数厂家都有各自专用的调光控制协议，但是不同厂家的设备之间互不兼容。
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