I recently switched to one of the new Jebao DCT-4000 return pumps. I am very pleased with it (quiet, powerful, controllable).

I assume it would be possible to control it via RA pretty easily. Has anyone written anything for these DCT units? I don't have an RA yet but expect to someday.

I think the DCT can't be controlled. Someone correct me if I'm wrong. They use a different connector than the jaebo and waveline pumps and do not use a PWM signal.

Yeah, you can't control the DCT series pumps. They use the same connector as the older versions of the Jebao's. Here is a link that kinda explains it.

http://digital-reefs.com/?p=9004