[S] is used only to change the Step of the secondary mirror movement, to change the BFL.
The menus available (use [+] and [–] to see them in the last line of the display) are described here:
press [E] to enter each function
SET TEMPERATURE
Use [+] and [–] to change the values, [E] goes back
SET FAN SPEED
Use [+] and [–] to change the values, [E] goes back
BFL CONTROL. This is the only menu item that has sub-menus. Again, use [+] and [-] to choose,
[E] t enter each function
MOVE SECONDARY MIRROR
Use [+] and [–] to move the mirror, [S] to change step, [E] goes back
FIND OPTIMAL
Pressing [E], the mirror will reach the optimal position, set during manufacturing.
BACKSLASH ENABLE
Press [+] to enable the backslash compensation, [-] to disable, [E] goes back
BACKSLASH VALUE
Use [+] and [-] to change the backslash value (unit is 1/100 mm). [E] goes back
BACKSLASH DIRECTION
Use [+] and [-] to set the direction of the backslash movement. [E] goes back
EXIT AND GO BACK
With [E] you go back to the top level menu.
DISPLAY BACKLIGHT
Use [+] and [-] to change display brightness, [E] goes back
SHUTTER
Use [+] and [-] to open or close the shutter, [E] goes back
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