I don't think you can. I believe the Haze Generator uses a 1/4" plug for its remote and the Operator Pro has a MIDI plug output for fog control. The best way to make it work would be to press down the continuous button on the Hazer remote and plug it into a DMX relay pack. I know the Fog Storm 1200/1700 and Vapor Flow are compatible with the Operator Pro.
Hope that helps.