To what device do you want to hook the DMX controller to, via the Modbus ? Are you using a PLC or what ?
A block diagram will help.
I have been designing DMX based control systems for musical fountains, son-et-lumieres & variety of horror rides since
1993 but hav'nt come across a modbus situation yet. We directly control valves , lights and even pumps via DMX. The DMX is generated thru PC based specialized software or thru in DMX data storage modules.
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