SMA Sunny Data Control V.5.0 - Manual (Page 107)

Transferring Data to the Internet SMA Technologie AG
Technical Description SDC-TEN081450 109
The tool "SDC agent" serves as a communication intermediary between the Java applets and Sunny
Data Control. For this purpose, it is installed on the HTML web server's computer. The
communication between the applets and the agent, as well as between Sunny Data Control and the
agent, occurs via a dedicated TCP connection.
Two different modes of connection from the PV plant to Sunny Data Control serve as the information
source for the applets' display of measured values.
Direct Connection
The Sunny Boy Control is permanently in contact with Sunny Data Control via a direct RS232 /
RS485 connection. The measured values are queried directly from the connected PV plant, and
transferred to the Internet.
This mode enables the entire range of all different display types to be shown on the applets. This
mode is preferable, as it offers the most possibilities.
Offline Connection
With this mode, there is no permanent connection between the Sunny Boy Control and Sunny Data
Control (e.g. only a temporary modem connection). The only data source is the content of the online
data file (see section 12.5. 1 "Write Online Data File" (Page 103)).
This only enables the applets to show the device field display. No other display types are possible.