Specifications

HHD
102
4
4.5 READING PARAMETERS
4.5.1 Trigger Signal
Trigger signal is useful to determine the modality of the reader ON state for readers
with trigger when hardware trigger is selected:
• trigger level: the reader goes ON when the trigger is pressed and goes OFF
when it is released
• trigger pulse: the reader goes ON at the first trigger press and goes OFF only at
a second press
4.5.2 Trigger-Off Timeout
When this timeout is selected, the reader turns OFF automatically after the desired
period of time.
4.5.3 Reads per Cycle
In general, a reading cycle corresponds to the ON + OFF times of a device.
The resulting effects of this parameter on code reading depend on other related
configuration conditions. Here are the definitions of ON and OFF times.
• For readers using the software trigger parameter (FLASH MODE), a reading
cycle corresponds to the
flash on + flash off times. Code reading takes place
during the
flash on time.
• For readers using the hardware trigger parameter, a reading cycle corresponds
to a trigger press (ON) + one of the following OFF events:
trigger release (for trigger active level)
a second trigger press (for
trigger active pulse)
trigger-off timeout (see par. 4.5.2).
When one read per cycle is selected, the device decodes only one code during the
ON period and immediately turns the reader OFF
. It is only possible to read another
code when the next ON time occurs.
In multiple reads per cycle, the ON period is extended so that the device can
continue decoding codes until an OFF event occurs. For software trigger mode, the
flash on period is immediately reset after each read and therefore extended. If
another code is decoded before the reset
flash on period expires, it is again reset