diff --git a/script/RobotSC.py b/script/RobotSC.py
index 9ffdc46..2737823 100644
--- a/script/RobotSC.py
+++ b/script/RobotSC.py
@@ -45,9 +45,12 @@ class jf6(ReadonlyRegisterBase):
 class jfc(ReadonlyRegisterBase):
     def doRead(self):
         if robot.joint_forces == None:
+            print "*",
             return  None 
         if robot.powered == False:
+            print ".",
             return None
+        print "!",
         return (robot.joint_forces[1]+74)/4  + (robot.joint_forces[2]+30)/4 + (robot.joint_forces[4]-0.8)/0.2
 
 add_device(jf1(), force = True)