+private:
+
+ void add_channel(const std::string& config);
+ FGProtocol* parse_port_config( const std::string& cfgstr );
+
+private:
+
+ // define the global I/O channel list
+ //io_container global_io_list;
+
+ typedef std::vector< FGProtocol* > ProtocolVec;
+ ProtocolVec io_channels;
+
+ SGPropertyNode_ptr _realDeltaTime;
+};