Merge branch 'sort_setting_values' of github.com:dls-controls/pythonIoc into sort_setting_values

Author: AlexanderWells-diamond

softioc/device.py

@@ -404,10 +404,8 @@ def _value_to_epics(self, value):
         # Note that the trailing null is needed to work around problems with
         # some clients.
         value = numpy.frombuffer(value + b'\0', dtype = numpy.uint8)
-
-        # Truncate value to fit
-        if hasattr(self, '_nelm'):
-            value = value[:self._nelm]
+        # Ensure string isn't too long to fit into waveform
+        assert len(value) <= self._nelm, 'Value too long for waveform'
         return value
 
     def _epics_to_value(self, value):