As currently implemented, don't bother. When combined with GET, angles are actually misreported. Object coordinates are stored internally as integer arc-minutes. They're fixed, not variable. Otherwise you'll get a 1.
Many commands get no response.
A or P control-D go to Download mode. Leave LX200 mode. Quit focus motion. Manually keying things to convince the Autostar to cycle through some update code can avoid the Proc 2 Trap. I have not tested that theory.