diff --git a/secop_psi/dpm.py b/secop_psi/dpm.py
index 70e32be..e8c7de4 100644
--- a/secop_psi/dpm.py
+++ b/secop_psi/dpm.py
@@ -85,7 +85,7 @@ class DPM3(HasIO, Readable):
         else:
             cmd = ""
         cmd = cmd + '*1G3%02X' % adr
-        hexvalue = self._iodev.communicate(cmd)
+        hexvalue = self.communicate(cmd)
         if adr == self.SCALE:
             mag = self.MAGNITUDE[hexvalue[0:1]]
             value = int(hexvalue[1:], 16)
@@ -95,7 +95,7 @@ class DPM3(HasIO, Readable):
 
     def write_digits(self, value):
         # value defines the number of digits
-        back_value = self._iodev.communicate('*1F135%02X\r*1G135' % (value + 1))
+        back_value = self.communicate('*1F135%02X\r*1G135' % (value + 1))
         self.digits = int(back_value, 16) - 1
         # recalculate proper scale and offset
         self.write_scale_factor(self.scale_factor)
@@ -103,11 +103,11 @@ class DPM3(HasIO, Readable):
         return Done
 
     def read_digits(self):
-        back_value = self._iodev.communicate('*1G135')
+        back_value = self.communicate('*1G135')
         return int(back_value,16) - 1
 
     def read_value(self):
-        return float(self._iodev.communicate('*1B1'))
+        return float(self.communicate('*1B1'))
 
     def read_offset(self):
         reply = self.query(self.OFFSET)
diff --git a/secop_psi/ls340res.py b/secop_psi/ls340res.py
index 5709f34..d1a5c7c 100644
--- a/secop_psi/ls340res.py
+++ b/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))
diff --git a/secop_psi/uniax.py b/secop_psi/uniax.py
index cc3ff5c..22443be 100644
--- a/secop_psi/uniax.py
+++ b/secop_psi/uniax.py
@@ -71,6 +71,7 @@ class Uniax(PersistentMixin, Drivable):
     _find_target = 0
 
     def earlyInit(self):
+        super().earlyInit()
         self._zero_pos_tol = {}
         self._action = self.idle