fix code for current framwork version

- remove _iodev, use HasIo instead of HasIodev
- add earlyInit super call

secop_psi/ls340res.py

@@ -24,7 +24,7 @@ import time
 
 from secop.datatypes import StringType, FloatRange
 from secop.modules import Parameter, Property, Readable
-from secop.io import HasIodev, StringIO
+from secop.io import HasIO, StringIO
 
 
 class LscIO(StringIO):
@@ -33,13 +33,13 @@ class LscIO(StringIO):
     wait_before = 0.05
 
 
-class ResChannel(HasIodev, Readable):
+class ResChannel(HasIO, Readable):
     """temperature channel on Lakeshore 340"""
 
-    iodevClass = LscIO
+    ioClass = LscIO
 
     value = Parameter(datatype=FloatRange(unit='Ohm'))
     channel = Property('the channel A,B,C or D', StringType())
 
     def read_value(self):
-        return float(self._iodev.communicate('SRDG?%s' % self.channel))
+        return float(self.communicate('SRDG?%s' % self.channel))