AJDurrani Everything works except that I cannot set the slew speed in Preview mode.
The Temma Jr has two slew speeds (on the hand controller, it is set by the Fast/Slow button). The slow speed is basically a guide rate (before the autoguiding days, we used to guide using an eyepiece with an illuminated reticle) that can be set for between 0.1x and 0.9x sidereal. We would keep pressing the direction buttons (at guide rate) to keep the guide star centered in eyepiece of the guide scope.
With the older Temma 2 Jr, the faster slew speed depends on whether you run the mount on 24V (in which case, the high slew speed is 700x sidereal rate) or 12V (where the slew rate is 350x siderea rate). With newer Temma, I believe the high slew speed is fixed at 700x sidereal (I have the old one, so cannot confirm for sure)
So, the old Temma Jr effectively had three speeds if you feed it with 24V. You can select 350x (by telling it to use the slew speed for 12V), or 700x, or a guide rate between 0.1x and 0.9x.
In my cocoaTemma program (http://www.w7ay.net/site/Applications/cocoaTemma/Users%20Manual/index.html), I had implemented the 12V/24V selection like so,
And for selecting between high and slow speed, I had implemented guide/slew selection buttons below the direction buttons this way (to mimic the hand controller):
I am pretty certain ZWO did not implement the 12V/24V selection. I do not remember if ASIAIR lets you select between high speed direction button and slow speed direction button.
Chen
