| 摘要 |
A theatre system operating in compliance with the DMX512 protocol is also able to support remote channel assignment of the various theatre devices included therein as well as other auxiliary operating modes by establishing a device hierarchy based on unique ID numbers assigned to the theatre devices when DMX communication is inactive. The theatre devices communicate with each other bi-directionally to establish a device hierarchy. Each theatre device has a pre-assigned unique device identification number, and a hierarchy is established based on these unique ID numbers. One way to establish a hierarchy is to create a list of the unique device identification numbers of the bi-directional theatre devices in the system, and then determine the position of each theatre device on the list. The list may be assembled by one of the bi-directional theatre devices and broadcast to all when completed, or each bi-directional theatre device may itself assemble a complete list. Determining the positions of the theatre devices may be performed by each of the bi-directional theatre device for itself, in which case the bi-directional theatre devices store substantially identical lists and each of them compares its unique ID number to the list to establish its position in the list. Alternatively, one of the bi-directional theatre devices may calculate the respective positions in the list of all of the bi-directional theatre devices, and then communicate the position information for a particular theatre device to that device.
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