diff --git a/script/RFscan/phase_scan_caqtdm_dv2.py b/script/RFscan/phase_scan_caqtdm_dv2.py
index 578e787..bba9408 100644
--- a/script/RFscan/phase_scan_caqtdm_dv2.py
+++ b/script/RFscan/phase_scan_caqtdm_dv2.py
@@ -3,10 +3,12 @@ import  ch.psi.pshell.epics.ControlledVariable as ControlledVariable
 latency = 0.05
 
 if get_exec_pars().source == CommandSource.ui:
-    prefix = "SINSB04-RSYS"
+    prefix = "SINSB04"
 else:
     prefix = args[0]
 
+prefix += "-RSYS" 
+print "Prefix = ", prefix
 
 start   = caget(prefix + ":SET-SCAN-START")
 stop    = caget(prefix + ":SET-SCAN-STOP")