diff --git a/script/optics/ExitSlitYScanKei.py b/script/optics/ExitSlitYScanKei.py
index 22210d2e..359b025c 100644
--- a/script/optics/ExitSlitYScanKei.py
+++ b/script/optics/ExitSlitYScanKei.py
@@ -23,6 +23,7 @@ caput(KEI_DIODE + "DOSETDEFAULT", 0)
 time.sleep(1.0)
 caput(KEI_DIODE + "DOSETADVANCED", 0)
 time.sleep(1.0)
+caput(KEI_DIODE + "DATAFORMAT", 1)
 #caput(KEI_DIODE + "READSCAN.SCAN", 0)
 #caput(KEI_DIODE + "NPLC", 1)
 caput(KEI_DIODE + "NAVG", DWELL / 0.02)