implemented config file read and default write

User_Interface.py

@@ -275,7 +275,7 @@ class StatusDisplay(Frame):
         for axis in g.AXES:
             if axis.device is not None:
                 axis.update_status_info()
-            self.label_dict["PSU Serial Port:"][i].set(g.ports[i])
+            self.label_dict["PSU Serial Port:"][i].set(g.PORTS[i])
             self.label_dict["PSU Channel:"][i].set(axis.channel)
             self.label_dict["PSU Status:"][i].set(axis.connected)
             self.label_dict["Arduino Status:"][i].set(g.ARDUINO.connected)  # ToDo (optional): make this multicolumn