diff --git a/script/optics/ExitSlitYScan.py b/script/optics/ExitSlitYScan.py
index 794dd10c..f89429bc 100644
--- a/script/optics/ExitSlitYScan.py
+++ b/script/optics/ExitSlitYScan.py
@@ -15,6 +15,7 @@ DWELL = 0.1
 TOTAL_TIME = 120
 #STEPS = int(TOTAL_TIME / DWELL) + 1
 STEPS = 150
+LATENCY = 0.2
 
 def trig():
     #wait_beam()