The ETC Serial Button Protocol provides a means by which a host device (e.g. a personal computer) can send operational commands to an ETC Expression (1), Impression, Insight or Concept 500 lighting control console. For example, the Serial Button Protocol makes it possible to use a PC remotely to control a console that is configured with no face panel.
The feature is supported in software releases higher than 1.83.
Attached is the original ETC/LMI Serial Button Protocol guide for Expression (1) series consoles.
2677 Serial Button Protocol