diff --git a/secop_psi/ls370res.py b/secop_psi/ls370res.py
index 26786ae..27e1a33 100644
--- a/secop_psi/ls370res.py
+++ b/secop_psi/ls370res.py
@@ -120,6 +120,11 @@ class Main(HasIodev, Drivable):
             self.status = [Status.BUSY, 'switching']
         return channel
 
+    def write_autoscan(self, value):
+        scan.send_change(self, self.value, value)
+        # self.sendRecv('SCAN %d,%d;SCAN?' % (channel, self.autoscan))
+        return value
+
 
 class ResChannel(HasIodev, Readable):
     """temperature channel on Lakeshore 336"""
@@ -158,16 +163,24 @@ class ResChannel(HasIodev, Readable):
     dwell = Parameter('dwell time with autoscan', datatype=FloatRange(1, 200), readonly=False, handler=inset)
     filter = Parameter('filter time', datatype=FloatRange(1, 200), readonly=False, handler=filterhdl)
 
+    _trigger_read = False
+
     def initModule(self):
         self._main = self.DISPATCHER.get_module(self.main)
         self._main.register_channel(self)
 
     def read_value(self):
-        if self.channel != self._main.value:
-            return Done
         if not self.enabled:
             self.status = [self.Status.DISABLED, 'disabled']
             return Done
+        if self.channel != self._main.value:
+            if self.channel == self._main.target:
+                self._trigger_read = True
+                return Done
+            if not self._trigger_read:
+                return Done
+            # we got here, when we missed the idle state of self._main
+        self._trigger_read = False
         result = self.sendRecv('RDGR?%d' % self.channel)
         result = float(result)
         if self.autorange == 'soft':