The LWDEFAULT variable stores the actual value used to display entities having "default" lineweight. You should specify all values in hundredths of millimeters subject to the OdDb::LineWeight enumeration.
Access Methods
OdDbDatabase::getSysVar()
OdDbDatabase::setSysVar()
OdDbHostAppServices::getLWDEFAULT() – gets the default lineweight as an integer (enumeration) value
OdDbHostAppServices::setLWDEFAULT() – sets the default lineweight as an integer (enumeration) value