diff --git a/cfg/dil5_cfg.py b/cfg/dil5_cfg.py
index 37af8e18..fab68b9e 100644
--- a/cfg/dil5_cfg.py
+++ b/cfg/dil5_cfg.py
@@ -1,14 +1,12 @@
-# by ID (independent of plug location)
+# by id (independent of plug location, but may not neccessarly be unique)
+# to verify just do:
+#   ls /dev/serial/by-id
 turbo_uri = '/dev/serial/by-id/usb-FTDI_FT232R_USB_UART_A601PCGF-if00-port0'
 press_uri = '/dev/serial/by-id/usb-FTDI_FT232R_USB_UART_AH07445U-if00-port0'
 itc_uri = '/dev/serial/by-id/usb-Prolific_Technology_Inc._USB-Serial_Controller_D-if00-port0'
 lsc_uri = '192.168.1.2:7777'
-# by plug location:
-#turbo_uri='/dev/serial/by-path/platform-fd500000.pcie-pci-0000:01:00.0-usb-0:1.1:1.0-port0'
-#press_uri = '/dev/serial/by-path/platform-fd500000.pcie-pci-0000:01:00.0-usb-0:1.2:1.0-port0'
-#itc_uri = '/dev/serial/by-path/platform-fd500000.pcie-pci-0000:01:00.0-usb-0:1.3:1.0-port0'
-# over USB (does not work anymore)
-#lsc_uri='serial:///dev/ttyACM1?baudrate=57600+parity=odd+bytesize=7+stopbits=1',
+logo_ip = '192.168.0.3'
+# by plug location would also be possible (/dev/serial/by-path)
 
 
 Node('dil5_logo.psi.ch',
@@ -20,7 +18,7 @@ Node('dil5_logo.psi.ch',
 Mod('logo',
     'frappy_psi.logo.IO',
     '',
-    ip_address = "192.168.0.3",
+    ip_address = logo_ip,
     tcap_client = 0x3000,
     tsap_server = 0x2000
 )
@@ -45,7 +43,7 @@ Mod('V4',
     'frappy_psi.logo.DigitalActuator',
     'compressor to dump',
     io = 'logo',
-    # feedback_addr ="V1024.5",  # not verified
+    # feedback seems not to work
     output_addr ="V1064.7",
     target_addr ="V404.1",
 )
diff --git a/cfg/sea/ah2700.addon.json b/cfg/sea/ah2700.addon.json
index 1069ea85..ee75afba 100644
--- a/cfg/sea/ah2700.addon.json
+++ b/cfg/sea/ah2700.addon.json
@@ -12,4 +12,4 @@
 {"path": "node", "type": "text", "readonly": false, "cmd": "capslope node"},
 {"path": "unit", "type": "float", "readonly": false, "cmd": "capslope unit", "description": "unit=60: mainunits/minutes, unit=1: mainunits/sec"},
 {"path": "ref", "type": "float", "readonly": false, "cmd": "capslope ref"},
-{"path": "buffersize", "type": "float", "readonly": false, "cmd": "capslope buffersize"}]}}
+{"path": "bufperiod", "type": "float", "readonly": false, "cmd": "capslope bufperiod"}]}}
diff --git a/cfg/sea/dil2.stick.json b/cfg/sea/dil2.stick.json
index 5a10580a..343973f2 100644
--- a/cfg/sea/dil2.stick.json
+++ b/cfg/sea/dil2.stick.json
@@ -18,7 +18,7 @@
 {"path": "heaterselect", "type": "enum", "enum": {"sample": 0, "mix": 1, "mix(temporarely)": 2}, "readonly": false, "cmd": "ts heaterselect"},
 {"path": "control", "type": "enum", "enum": {"off": 0, "sample": 6, "mix": 5, "samplehtr": 8}, "readonly": false, "cmd": "ts control", "description": "click off to reload list"},
 {"path": "heatermode", "type": "enum", "enum": {"disabled": -1, "off": 0, "on": 1}, "readonly": false, "cmd": "ts heatermode"},
-{"path": "heaterrange", "type": "enum", "enum": {"2uW": 1, "20uW": 2, "200uW": 3, "2mW": 4, "20mW": 5}, "readonly": false, "cmd": "ts heaterrange"},
+{"path": "heaterrange", "type": "enum", "enum": {"off": 0, "2uW": 1, "20uW": 2, "200uW": 3, "2mW": 4, "20mW": 5}, "readonly": false, "cmd": "ts heaterrange"},
 {"path": "autoheater", "type": "bool", "readonly": false, "cmd": "ts autoheater", "description": "automatic heater range", "kids": 12},
 {"path": "autoheater/wlp0", "type": "float", "readonly": false, "cmd": "ts autoheater/wlp0", "description": "weak link base temperature (used for auto heater)"},
 {"path": "autoheater/wlp1", "type": "float", "readonly": false, "cmd": "ts autoheater/wlp1", "description": "weak link temperature at 1 uW (used for auto heater)"},
diff --git a/cfg/sea/dil3.stick.json b/cfg/sea/dil3.stick.json
index 5a10580a..343973f2 100644
--- a/cfg/sea/dil3.stick.json
+++ b/cfg/sea/dil3.stick.json
@@ -18,7 +18,7 @@
 {"path": "heaterselect", "type": "enum", "enum": {"sample": 0, "mix": 1, "mix(temporarely)": 2}, "readonly": false, "cmd": "ts heaterselect"},
 {"path": "control", "type": "enum", "enum": {"off": 0, "sample": 6, "mix": 5, "samplehtr": 8}, "readonly": false, "cmd": "ts control", "description": "click off to reload list"},
 {"path": "heatermode", "type": "enum", "enum": {"disabled": -1, "off": 0, "on": 1}, "readonly": false, "cmd": "ts heatermode"},
-{"path": "heaterrange", "type": "enum", "enum": {"2uW": 1, "20uW": 2, "200uW": 3, "2mW": 4, "20mW": 5}, "readonly": false, "cmd": "ts heaterrange"},
+{"path": "heaterrange", "type": "enum", "enum": {"off": 0, "2uW": 1, "20uW": 2, "200uW": 3, "2mW": 4, "20mW": 5}, "readonly": false, "cmd": "ts heaterrange"},
 {"path": "autoheater", "type": "bool", "readonly": false, "cmd": "ts autoheater", "description": "automatic heater range", "kids": 12},
 {"path": "autoheater/wlp0", "type": "float", "readonly": false, "cmd": "ts autoheater/wlp0", "description": "weak link base temperature (used for auto heater)"},
 {"path": "autoheater/wlp1", "type": "float", "readonly": false, "cmd": "ts autoheater/wlp1", "description": "weak link temperature at 1 uW (used for auto heater)"},
diff --git a/cfg/sea/dil4.stick.json b/cfg/sea/dil4.stick.json
index 5a10580a..343973f2 100644
--- a/cfg/sea/dil4.stick.json
+++ b/cfg/sea/dil4.stick.json
@@ -18,7 +18,7 @@
 {"path": "heaterselect", "type": "enum", "enum": {"sample": 0, "mix": 1, "mix(temporarely)": 2}, "readonly": false, "cmd": "ts heaterselect"},
 {"path": "control", "type": "enum", "enum": {"off": 0, "sample": 6, "mix": 5, "samplehtr": 8}, "readonly": false, "cmd": "ts control", "description": "click off to reload list"},
 {"path": "heatermode", "type": "enum", "enum": {"disabled": -1, "off": 0, "on": 1}, "readonly": false, "cmd": "ts heatermode"},
-{"path": "heaterrange", "type": "enum", "enum": {"2uW": 1, "20uW": 2, "200uW": 3, "2mW": 4, "20mW": 5}, "readonly": false, "cmd": "ts heaterrange"},
+{"path": "heaterrange", "type": "enum", "enum": {"off": 0, "2uW": 1, "20uW": 2, "200uW": 3, "2mW": 4, "20mW": 5}, "readonly": false, "cmd": "ts heaterrange"},
 {"path": "autoheater", "type": "bool", "readonly": false, "cmd": "ts autoheater", "description": "automatic heater range", "kids": 12},
 {"path": "autoheater/wlp0", "type": "float", "readonly": false, "cmd": "ts autoheater/wlp0", "description": "weak link base temperature (used for auto heater)"},
 {"path": "autoheater/wlp1", "type": "float", "readonly": false, "cmd": "ts autoheater/wlp1", "description": "weak link temperature at 1 uW (used for auto heater)"},
diff --git a/frappy/ctrlby.py b/frappy/ctrlby.py
index a115e76e..73a66fbf 100644
--- a/frappy/ctrlby.py
+++ b/frappy/ctrlby.py
@@ -24,29 +24,20 @@ from frappy.core import Parameter, Attached
 
 
 class WrapControlledBy:
-    """mixin for modules with controlled_by
+    """mixin to add controlled_by to writable modules
 
-    Two use cases:
+    Create a wrapper class inheriting from this mixin
+    to add controlled_by to a Writable module
 
-    1) on the implementation of a hardware module it is already known that
-       HasControlledBy is wanted. In this case, functionality to apply the
-       target to the hardware has to be implemented in method 'set_target'
+    Usage:
 
-        class MyWritable(HasControlledBy, ...):
+        class Enhanced(WrapControlledBy, BaseWritable):
+            pass
 
-            def set_target(self, target):
-                "apply target to HW"
-                # no supercall needed!
+        # typically nothing else has to be implemented
 
-            # do not override write_target !
-
-    2) a hardware module is already available, and we extend it with the
-       controlled_by stuff
-
-        class Enhanced(HasControlledBy, BaseWritable):
-            set_target = BaseWritable.write_target
-
-        # nothing else is needed.
+    from a module with output (inheriting from HasOutput), the
+    method update_target must be called for internal updates
     """
 
     controlled_by = Parameter('source of target value', EnumType(members={'self': 0}), default=0)
@@ -87,12 +78,12 @@ class WrapControlledBy:
             self.write_controlled_by('self')
 
     def set_off(self):
-        """to be overriden if the off state should be different than the default
+        """to be overridden if the off state should be different from the default
 
         on a FloatRange() the default value is 0
         """
         self.self_controlled()
-        self.set_target_cby(self.parameters['target'].datatype.default)
+        self.internal_set_target(self.parameters['target'].datatype.default)
 
     def update_target(self, module, value):
         """update internal target value
@@ -108,28 +99,50 @@ class WrapControlledBy:
             if deactivate_control:
                 deactivate_control(module)
             self.controlled_by = module
-        target = self.set_target_cby(value)
+        target = self.internal_set_target(value)
         self.target = value if target is None else target
 
     def write_target(self, target):
         self.self_controlled()
-        return self.set_target_cby(target)
+        return self.internal_set_target(target)
 
-    def set_target_cby(self, target):
+    def internal_set_target(self, target):
+        # we need this additional indirection:
+        # super().write_target must refer to an inherited base class
+        # which is after WrapControlledBy in the method resolution order
         return super().write_target(target)
 
 
 class HasControlledBy(WrapControlledBy):
+    """mixin for controlled_by functionality
+
+    Create a wrapper class inheriting from this mixin
+    to add controlled_by to a Writable module
+
+    Usage:
+
+        class Enhanced(HasControlledBy, BaseWritable):
+            def set_target(self, value):
+                # implement here hardware access for setting target
+
+            # do not override write_target!
+
+    from a module with output (inheriting from HasOutput), the
+    method update_target must be called for internal updates
+    """
+
     def set_target(self, value):
         """to be overridden for setting target of HW"""
         raise NotImplementedError
 
-    def set_target_cby(self, value):
-        """to be overridden in case this mixin is not added on top"""
+    def internal_set_target(self, value):
+        # we need this additional indirection:
+        # self.write_target must refer to a base class which
+        # is before HasControlledBy in the method resolution order
         return self.set_target(value)
 
 
-class WrapOutputModule:
+class HasOutputModule:
     """mixin for modules having an output module
 
     this module will call the update_target method of an output module
@@ -145,7 +158,14 @@ class WrapOutputModule:
             self.output_module.register_input(self.name, self.deactivate_control)
 
     def write_control_active(self, value):
-        """override with supercall if needed"""
+        """override with supercall if needed
+
+        control_active is readonly by default, as specified in the SECoP standard.
+        This method is meant to be called internally.
+
+        However, it is possible to override control_active with readonly=False
+        and this is quite useful IMHO in some situations
+        """
         out = self.output_module
         if out:
             if value:
@@ -157,13 +177,16 @@ class WrapOutputModule:
                     out.set_off()  # this sets out.controlled_by to 0 (=self)
 
     def set_control_active(self, active):
-        """to be overridden for switching hw control"""
+        """to be overridden for switching hw control
+
+        TODO: remove this legacy method (replaced by write_control_active)
+        """
         self.control_active = active
 
     def activate_control(self):
         """method to switch control_active on
 
-        to be called from the write_target method, with the target as argument
+        TODO: remove this legacy method (replaced by write_control_active)
         """
         self.write_control_active(True)
 
@@ -178,16 +201,8 @@ class WrapOutputModule:
 
     def write_target(self, target):
         self.write_control_active(True)
-        return self.set_target_out(target)
-
-    def set_target_out(self, target):
-        return super().write_target(target)
-
-
-class HasOutputModule(WrapOutputModule):
-    def set_target(self, target):
-        """to be overridden except for WrapOutputModule"""
-        raise NotImplementedError
-
-    def set_target_out(self, target):
         return self.set_target(target)
+
+    def set_target(self, target):
+        """to be overridden"""
+        raise NotImplementedError
diff --git a/frappy_psi/sea.py b/frappy_psi/sea.py
index 1234d235..fa17547f 100644
--- a/frappy_psi/sea.py
+++ b/frappy_psi/sea.py
@@ -126,8 +126,7 @@ class SeaClient(ProxyClient, Module):
     _last_connect = 0
 
     def __init__(self, name, log, opts, srv):
-        nodename = srv.node_cfg.get('name') or srv.node_cfg.get('equipment_id')
-        instance = nodename.rsplit('_', 1)[0]
+        instance = srv.secnode.name.rsplit('_', 1)[0]
         if 'uri' not in opts:
             self._instance = instance
             port = get_sea_port(instance)