We have 4 stations, each station has 3 Datalogger CR6 and 1 PC with LoggerNet 4.x. Now, my plant has an upgrade project: Build a new SCADA (Siemens, Schneider or Rockwell,...) at a center station to monitoring all data of 4 stations. So now anyone knows how SCADA reads data from 4 LoggerNets? It needs OPC driver? An important requirement: in case connection between center and station loses then recovers, history data located in LoggerNet will be back-filled to SCADA center.