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OBID
i-scan
®
UHF
Manual
ID ISC.LRU3000/3500
FEIG ELECTRONIC GmbH
Page 175 of 193
H90202-7e-ID-B.docx
11.2. The Notification Mode Procedure
By using Notification Mode together with the Buffered Read Mode the Reader itself reads data
from every Transponder which is inside the antenna field
and
enables a connection to a host to
send the queued data asynchronously. This mode must be enabled in the
configuration block and configured in
7.37. CFG82: Notification Channel, Part 1
CFG83: Notification Channel, Part 2
configuration block. The settings for the Read Mode define the
notification information sent to the host.
Only one command is necessary to send sampled Transponder data sets. The figure below illu-
strates the Notification Mode procedure:
Reader
→
Host
[0x22]
Read Buffer Response
Notification data from the Reader to the Host
After successful send process, the Reader deletes
transferred data sets from the internal table
The reader sends notifications as fast as possible, if the notification trigger is set to continuously or
a very short cycle time in time-triggered mode is defined. To prevent a notification overflow in a
host application the acknowledgement option can be set. In this case the notification must be ac-
knowledged by the host with an response protocol to synchronize the notification process with the
host application. The figure below illustrates this procedure:
Reader
→
Host
[0x22]
Read Buffer Response
Notification data from the Reader to the Host
max. 5000ms
Reader
←
Host
[0x32]
Clear Data Buffer
Command to the Reader
to delete the notified data sets from the internal table
The acknowledge protocol [0x32] Clear Data Buffer must be in the space of 5 seconds. If no ac-
knowledge is received the Reader repeats the notification as it is configured.
If the host-triggered notification is defined, the reader sends never notifications, unless the host
sends a
11.8. [0x34] Force Notify Trigger
command. With this setting, the host application can con-
trol the amount and point of time of notifications.
Additional information about the capacity of the data buffer can be determined with the
In Notification Mode the
As an additional option Keepalive messages can be sent periodically to a host. Keepalive notifica-
tions are always never acknowledged. The information sent by a Keepalive notification is identical
with the command