From OpenSCADAWiki
The mode "Data"
The mode is used to reflect the OpenSCADA data on arrays of registers and bits of ModBus. The overall configuration of the node is made in the tab "Node" (Fig.2) by the parameters:
- State of the node, as follows: Status, "Enabled" and the name of the database containing the configuration, with tracking the availability of the data in different storages and providing the sequentially removing duplicates.
- Identifier, name and description of the node.
- The state "Enabled", in which the node must be translated at boot.
- Address of the node in the ModBus network from 1 to 247.
- Input transport, to the network of which the node is belonged to. It is selected from the list of input transports of the subsystem "Transports" of OpenSCADA. Specifying the symbol "*" as the transport makes this node a participant of any ModBus network with the processing of requests from any transport.
- Variant of the ModBus protocol, requests in which must be processed by the node from the list: All, RTU, ASCII, TCP/IP.
- Choice of the mode, in this case the mode "Data".
- Period of calculation of the data in seconds. Specifies the processing period of the data, which forming for the requests, that is: data tables of ModBus, the program of data calculation and servicing of links to the data of OpenSCADA.
- DAQ template or direct procedure language. Provides the selection of a template or language for a direct procedure for the formation and computation of ModBus data tables, as well as for servicing external links to the data model of the subsystem "Data Acquisition".