Omron H5CZ Manual page 19

Mode S: Stopwatch (Timer resets when power comes ON.)
Basic operation
Power
Start signal
input
Timing
Reset
*
Display
(for elapsed
*
RST flashes
time)
The signal starts and stops timing.
The display is held and timing is continued if the reset
is received during timing operation.
The timer resets if the reset is received when the
timing operation is stopped.
Note: Output is instantaneous when setting is 0.
Detailed operation
Power
Start signal
Reset
9999
Set time
UP
0
Set time
DOWN
0
Output
H5CZ
Timer
19