Where a third-party server uses the DNP3 protocol to obtain data from Geo SCADA Expert, and Geo SCADA Expert uses the DNP3 protocol to obtain its data from an outstation, Geo SCADA Expert becomes dual-purpose, with regard to DNP3. When communicating with the third-party server, Geo SCADA Expert acts as a DNP3 Slave, and when communicating with the outstation, Geo SCADA Expert acts as a DNP3 Master.
In this scenario, you need to configure Geo SCADA Expert as both a DNP3 master (see Geo SCADA Expert as a DNP3 Master Communicating with DNP3 Outstations), and a DNP3 Slave, (see Third-Party Master Communicating with a Geo SCADA Expert DNP3 Slave)
The diagram below shows a third party server acting as a DNP3 master to Geo SCADA Expert, and Geo SCADA Expert acting as a master to a DNP3 outstation. This scenario might be required, for example, should a system have a hierarchical structure, whereby Geo SCADA Expert and/or a third-party server provide control and monitoring features for different subsets of data.
