One more point that is slightly on a tangent, Alex. If you enable TC on the Optec, watch what it does closely. As I mentioned above, it makes a focuser move for every 0.1C change in temperature, and it does this for every 0.1C change in every direction. For my application, they do not have enough hysteresis built into the temperature reading. As a result, the temperature reading often “bounces” up and down by 0.1C. For every “bounce”, regardless of direction, the FocusLynx controller will move the focuser. This can be a real problem. As temperatures drop, the focuser should be moving “IN” to compensate. But, because of the “bouncing” in the temperature reading, sometimes the controller moves the focuser “OUT” when the temperature bounces up a tenth of a degree. Since all focusers have some backlash, this is a real problem. If the focuser only moves “IN” the backlash stays spooled up. But any bounce in the “OUT” direction moves the focuser into the backlash band. The next move back “IN” again only takes up the backlash just introduced and does not move the focuser. This will cause the compensation to not keep up with temperature changes.
I pointed this out to Jeff at Optec and he said they would look into it. When I asked him about it again several months later, I got no reply despite repeated attempts. I called their support staff a few weeks ago (didn’t talk to Jeff) and they blamed it on the larger step size of the Moonlite I am using - even though they said the Focuslynx would work fine with the Moonlite when I bought it.
I say this not to slam Optec support (though I have to say that I am very disappointed) but to make you aware of the potential issue.
I have since had to revert to the Arduino-based FocuserPro2 that I had previously built (and the TC works perfectly - thanks again Robert).