User manual

Reference PTQ-104S Rev2 ♦ Quantum Platform
User Manual IEC 60870-5-104 Server for Quantum
Page 156 of 195 ProSoft Technology, Inc.
February 22, 2013
When closing the connection, the module can be configured to clear all the
messages in its queue. The following parameter is used to implement this task:
The above configuration would cause the module to delete all pending
messages/events while closing the connection to the Client.
9.2.6 Events
In order to improve communication efficiency, most applications will require the
Client to periodically poll for data changes with a higher priority than polling for
other monitored data. Every time a data point changes, the server can send this
information as an event, typically with date and time information indicating when
the change occurred.
The module supports a buffer queue of 99 events per data type. When the queue
is full, the module will delete the oldest event in the queue, replacing it with the
newest event received for that data type.