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Hi Andrew
I just added a simple focus control to my LX200 driver program. It has IN/OUT controls and you can select fast or slow. I don't know what it does on a GPS model but on the LX200 "FAST" gives a polarised 2 Volts on a meter depending on whether it is in or out and Slow gives about 1 volt on the meter. I don't have a focuser to test with and I did not have time to rig a small motor.
Controls #:F+#, #:F-#, #:FF# and #:FS# are common to LX200 classic and GPS. These are all I used. The LX200 has its own driver U14 but this IC is only ever used if a Meade focuser is plugged in.
I did not look at the waveform but I imagine it is PWM
As you say there is no actual position indication.
Barry
PS I had a terrible job testing it. My computer would not find COM 1 or 2. I ended up testing on another computer. The USB/COM adaptor and cable had packed it in. It must have got damaged when my foot got tangled in the cable and near pulled the computer of the desk.
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