You posted under Deihl time clock.
1) Deihl makes 120V and 240V timers with NO and NC terminals.
These timers usually have 5 terminals. Some have 4 terminals.
Facing the terminals, first two terminals on left are for clock motor. Use multimeter set to read 120V and then 240V to check voltage of your clock motor.
Three terminals on right are NO, COM and NC.
Turn power off, pull wires loose and use multi-meter set to Ohms to check continuity of terminals and figure out which terminal is which.
2) Open following links to help identify your manual.http://www.borggeneral.com/diehl-control-timers.htmlhttp://www.borggeneral.com/industrial-timers.html
3) Other companies make similar timers, with various wiring, but all can be tested as shown in #1 above.
4) Add a comment and describe your timer and what timer is connected to.
This will give us clearer idea how to answer your question without guessing.
Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.
Sample 120V Deihl 880 wiring: