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The ELS options are Feed Control, Taper cutting, Threading, and Indexing
The control panel for the system has 5 momentary buttons, four in a N E
S W layout (cross), and one the the left of this set. The four in the
cross can be thought of as up, down, left, right. The other button is
the selection button.
Presses of the selection key cycles you through the options discussed
and their sub options.
When you are in the Indexing option the screen will show

??? Req:? 0.00???? z:? 1
??? Act:? 0.00???? a:? 1

Act: shows the current position of the spindle in degrees
z: shows the required number of increments
a: shows the current number of increments
Req: shows the required angular position for the current increment number

Presses of the Up and Down button will increment or decrement the z value

Let us assume that we want 100 divisions on the OD of a dial which is in
the chuck. We have a Vee shaped tool which we can traverse across the
dial OD to leave a groove.

Press up to increment z: to 100
Traverse across the dial OD with the tool
Press the right button to increment a: to 2
Req: will now show 3.6. Manually rotate the spindle until Act matches
Req. If you overshoot you can reverse.
Traverse across the dial OD with the tool
Press the Right button to increment a: to 3
The display will now show

??? Req:? 7.20 ? ? z:100
??? Act:? 3.60 ??? a:? 3

Manually rotate the spindle etc etc

Some may find this option useful some not but it is there as the use of
the encoder for the primary ELS functions makes it available.

Any queries just yell.
Richard