From OpenSCADAWiki
In OpenSCADA this mechanism is implemented by the following modules of the subsystem "DAQ":
- DAQGate — module of reflection of controller objects of the remote OpenSCADA-stations on the local one. The synchronous and asynchronous packet mode of reflection of the archives of the remote OpenSCADA-stations is provided.
- DiamondBoards — module for data accessing of PC/104 cards of Diamond Systems company. PC/104 cards are available on the ISA-bus, hence, are local and available relatively quickly. When data acquisition is done through interruption the expectation of the packets of fast values (up to 200 kHz) in one second (up to 200000 values in the package) is made and the subsequent placing of packets in the archives of the DAQ parameter attributes are performed.