From OpenSCADAWiki
Acquisition of the BFN module is made by the SOAP/XML protocol (the CGI service "/cgi-bin/imwl_ws.cgi" on port 8000 mostly), during which it can be obtained at once all available data of the one house computer. As a result of this, and because of the connection of multiple house computers to one BFN module, total query time of current data can reach 30 (thirty) seconds!