Here's my ExecCommand call:
            int opcode = 6001;
            int value = 0; // Restore Defaults;

            string inXML = "<inArgs>" +
                                 $"<scannerID>{ScannerID}</scannerID>" +
                                 "<cmdArgs>" +
                                        $"<arg-int>{value}</arg-int>" +
                                 "</cmdArgs>" +
                             "</inArgs>";
            cCoreScannerClass.ExecCommand(opcode, inXML, out outXML, out _status);

my "inXML" after formatting:
            <inArgs><scannerID>3</scannerID><cmdArgs><arg-int>0</arg-int></cmdArgs></inArgs>