diff --git a/script/device/Pixel.py b/script/device/Pixel.py
index dfcd170..1babbf0 100644
--- a/script/device/Pixel.py
+++ b/script/device/Pixel.py
@@ -55,11 +55,12 @@ class Pixel(DeviceBase, Readable):
 
     def get_count_id(self):
           ret = caget (self.prefix + ":FNUM", 'i') 
-          setCache(ret, None)
+          self.setCache(ret, None)
+          return ret
 
     def set_count_id(self, val):
           caput (self.prefix + ":FNUM", int(val)) 
-          setCache(ret, int(val))
+          self.setCache(int(val), None)
 
     def get_expose(self):
           return caget (self.prefix + ":EXPOSE", 'd') / 1000.0