ACU-RITE 300S READOUTS - Manual (Page 25)

300S 11
I - 2 Gener
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The 300S can still cross over reference marks at a later time. Such as
if it becomes necessary to define a datum that can be re-established
after a power interruption.
8 Press the ENABLE REF soft key to activate the position recovery
routine. Press the RIGHT / LEFT arrow key if the soft key is not
shown on current screen.
Enable/Disable Ref function
The ENABLE/DISABLE soft key, that is present during the position
recovery routine, allows the operator to select a specific reference
mark on an encoder. This is important when using encoders with
Fixed Reference Marks (instead of ones with Position-Trac™ feature).
When the DISABLE REF soft key is pressed, the recovery routine is
paused and any reference marks that are crossed during encoder
movement are ignored. When the ENABLE REF soft key is then
pressed, the recovery routine once again becomes active and the next
crossed reference mark will be selected.
Not all reference marks have to be crossed over on each encoder, only
those that are needed.
8 Once reference marks for all desired axes are established, press the
NO REF soft key to cancel out of the routine. If all reference marks
have been found, the 300S will return to the DRO display
screen automatically.
If an encoder is setup without reference marks, then the
REF indicator will not be displayed, and a datum set from
any axis will be lost once power is turned off.