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5
5.6.3
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:
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
and the effect is that the device remains ON, decoding codes until the flash on or
timeout period expires.
The Safety Time parameter should be used in this case to avoid unwanted multiple
reading of the same code, see par. 5.6.4.
5.6.4
Safety Time
Safety time prevents the device from immediately decoding the same code more
than once. Same code consecutive reading can be disabled requiring the reader to
be removed from the code (no decoding) for at least 400 ms, or a timeout can be set
up to 9.9 seconds before the decoder will accept the same code. Reading is
immediate if the code changes.
150
trigger release (for trigger active level)
a second trigger press (for trigger active pulse)
trigger-off timeout (see par. 5.6.2).
DRAGON™
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