diff --git a/script/optics/ExitSlitYScanKei.py b/script/optics/ExitSlitYScanKei.py
index 14801b0a..a6679057 100644
--- a/script/optics/ExitSlitYScanKei.py
+++ b/script/optics/ExitSlitYScanKei.py
@@ -34,7 +34,8 @@ caput(KEI_RMU + "RANGE", 8) # 2 nA
 
 def trig():
     wait_beam()
-    caput(KEI_DIODE + "DOREAD", 1)
+    caput(KEI_DIODE + "DOREAD", 0)
+    #caput(KEI_DIODE + "DOREAD", 0)
     #caput(KEI_DIODE + "DOINIT", 1)
     #caput(KEI_RMU + "DOINIT", 1)
     #time.sleep(1.0)