BlueBox IDTRONIC GEN2 ADVANT UHF, Руководство пользователя

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BLUEBOX Advant UHF Page 23 of 102
3 Operating Features
In ‘continuous’ mode the BLUEBOX is characterized by the coexistence of 2
‘parallel’ and asynchronous activities: the tag identification (inventory) and the
communication with the ‘host’ system. The ‘continuous’ identification acti
vity
interacts with the communication activity through a buffer that contains the code
of the last identified tags or that is empty indicating the absence of tags. Due to
synchronization and filtering reasons, the buffer is handled for each identified
tag
by a parameter defined as ‘hold time’ (same as ‘filter time’ defined below,
to be set in the range of 0 … 99 seconds or 0 ... 99 minutes, default value 1
second) and allows to extend ‘artificially’ the presence of the tag after it leaves
the antenna’s infl
uence area; this behavior is observable looking at the yellow
led status that is ‘on’ indicating the presence of tags and also through the
activation of the relay nr 1 (if its ‘automatic’ management is enabled by the flag
defined in the general parameters ). Through the command ‘data request’ it is
possible to get the data contained in the buffer (tag/s ID/s and optionally tag/s
type/s, reading antenna and gate crossing direction in ‘gate mode’); the
indication of the reading antenna can be enabled/disabled through a flag defined
in the general parameters.
The BLUEBOX handles also a 1000 elements FIFO queue which is combined with
the ‘filter time’ general parameter (to be set in a range of 0 … 99 seconds or 0
... 99 minutes, default value 1 second) that prevents the queue saturation in
case of a tag ‘continuous’ presence. When a tag is identified, the BLUEBOX
verifies if it belongs to the list of read tags. If the tag do not belong to the list
(it is defined as ‘new’), its code will be inserted in the queue, a filter time
assigned to the tag will be started and the buzzer will be activated for 0.5
seconds (if its ‘automatic’ management is enabled by the flag defined in the
general parameters). Otherwise (the tag belong to the list of read tags), the
BLUEBOX verifies if the relative filter time is expired. In this case (the filter time
is expired), the tag is defined as ‘new’ and will be processed as described above,
otherwise only the relative filter time will be rearmed. Through the command
‘queue data request’ and the relative ‘ack’, it is possible to get the data contained
in the queue (tag ID and optionally tag type, reading antenna and gate crossing
direction in ‘gate mode’) and unload it; the indication of the reading antenna can
be enabled/disabled through a flag defined in the general parameters.
In ‘continuous’ mode the BLUEBOX can be configured to obtain the behavior of
a ‘spontaneous’ reader that will send a message on the RS232 serial line and
Ethernet line. This feature is enabled (on) / disabled (off) using a flag in the
general configuration of the reader
Two subsets of the ‘continuous’ mode are also defined:
• ‘Trigger’ mode: the activation and deactivation of the ‘continuous’ mode is
triggered with inputs. The trigger could be level sensitive or edge sensitive