Lathem AirTime ATX6 - Manual (Page 17)

ATX6 Installation and User Guide
Page 13
P Password (000 ~ 999)
For security purposes, you may set a unique password for your ATX6. To
change the Password, use the INC, NXT and SET buttons. The INC
button will increment the digit over the displayed cursor. The NXT
button will move the cursor to the next digit. The SET button will enter
your final selection. If you do not wish to change the current Password,
simply press SET.
This is the final step, indicated by the display showing the correct time
and Day-Of-Week cursor. Daylight Savings Time is also indicated.