Microgate WITTY User Manual page 53

Assignment is very easy and consists of interrupting the photocell (having a unique serial number) with one
hand and defining the required event type:
Scroll with the <up> and <down> arrow keys and select the event by pressing <OK>, then select <F1> to save.
In the following example the photocell with the serial number 1 is associated to the START event.
Repeat the operation with the other available photocells (at least the stop photocell):
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