OBID i-scanSystem-Manual ID ISC.LR2000FEIG ELECTRONIC GmbH Page 159 of 184 H60700-3e-ID-B.doc8.2. The Notification Mode ProcedureBy using Notification Mode together with the Buffered Read Mode the Reader itself reads data fromevery Transponder which is inside the antenna field and enables a connection to a host to send thequeued data asynchronously. This mode must be enabled in the 4.2. CFG1: Interface configurationblock and configured in 4.31. CFG49: Notification Channel configuration block. The settings for theRead Mode defines the notification information sent to the host.Only one command is necessary to send sampled Transponder data sets. The figure below illustratesthe Notification Mode procedure:Reader Host [0x22]Read Buffer ResponseNotification data from the Reader to the HostAfter successful send process, the Reader deletestransferred data sets from the internal tableThe reader sends notifications as fast as possible, if the notification trigger is set to continuously or avery short cycle time in time-triggered mode is defined. To prevent a notification overflow in a hostapplication the acknowledgement option can be set. In this case the notification must be acknowl-edged by the host with an response protocol to synchronize the notification process with the host ap-plication. The figure below illustrates this procedure:Reader Host [0x22]Read Buffer ResponseNotification data from the Reader to the Host max. 5000msReader Host [0x32]Clear Data BufferCommand to the Readerto delete the notified data sets from the internal tableThe acknowledge protocol [0x32] Clear Data Buffer must be in the space of 5 seconds. If no acknowl-edge is received the Reader repeats the notification as it is configured.If the host-triggered notification is defined, the reader never sends notifications, unless the host sendsa 8.8. [0x34] Force Notify Trigger command. With this setting, the host application can control theamount and point of time of notifications.Additional information about the capacity of the data buffer can be determined with the 8.5. [0x31]Read Data Buffer Info command.In Notification Mode the 8.4. [0x22] Read Buffer is not applicable.As an additional option Keepalive messages can be sent periodically to a host. Keepalive notificationsare never acknowledged. The information sent by a Keepalive notification is identical with the com-mand 6.9. [0x6E] Reader Diagnostic with mode = 0x01.
