diff --git a/script/Motor Test 3.py b/script/Motor Test 3.py
index a773e27..195acfa 100644
--- a/script/Motor Test 3.py	
+++ b/script/Motor Test 3.py	
@@ -1,5 +1,9 @@
 #Script imported from: Motor Test 3.xml
 
+#by default, failed
+ret = 'Test failed'
+status = False
+
 #TODO: Set the diplay names of positioners and detectors
 scan = ManualScan(['idX', 'idInkr'], ['idMotorStatus', 'idLogicalPosition', 'idDiameter', 'idMotorPosition', 'idPotiRaw', 'idPotiProc', 'idBtvsRaw', 'idBtvsProc', 'idDiff01', 'idDiff02'] , [0.0, 0.0], [3000.0, 10.0], [3000, 20])
 scan.start()
@@ -7,23 +11,31 @@ scan.start()
 #Creating channels: dimension 1
 #PseudoPositioner idX
 #RegionPositioner idInkr
-idInkr = Channel('{DEVICE}:INKR:2', type = 'd')
+#try one channel to see if accessible
+try:
+    idInkr = Channel(DEVICE+':INKR:2', type = 'd')
+except:
+    print "Unexpected error:", sys.exc_info()[0]
+    ret = 'Unable to create channel'
+    success = False
+    raise
+    sys.exit()
 #ScalarDetector idMotorStatus
-idMotorStatus = Channel('{DEVICE}:STA:1', type = 'd')
+idMotorStatus = Channel(DEVICE+':STA:1', type = 'd')
 #ScalarDetector idLogicalPosition
-idLogicalPosition = Channel('{DEVICE}:IST:2', type = 'd')
+idLogicalPosition = Channel(DEVICE+':IST:2', type = 'd')
 #ScalarDetector idDiameter
-idDiameter = Channel('{DEVICE}:DIAM:2', type = 'd')
+idDiameter = Channel(DEVICE+':DIAM:2', type = 'd')
 #ScalarDetector idMotorPosition
-idMotorPosition = Channel('{DEVICE}:IST1:2', type = 'd')
+idMotorPosition = Channel(DEVICE+':IST1:2', type = 'd')
 #ScalarDetector idPotiRaw
-idPotiRaw = Channel('{DEVICE}:POSA:1', type = 'd')
+idPotiRaw = Channel(DEVICE+':POSA:1', type = 'd')
 #ScalarDetector idPotiProc
-idPotiProc = Channel('{DEVICE}:POSA:2', type = 'd')
+idPotiProc = Channel(DEVICE+':POSA:2', type = 'd')
 #ScalarDetector idBtvsRaw
-idBtvsRaw = Channel('{DEVICE}:IST3:1', type = 'd')
+idBtvsRaw = Channel(DEVICE+':IST3:1', type = 'd')
 #ScalarDetector idBtvsProc
-idBtvsProc = Channel('{DEVICE}:IST3:2', type = 'd')
+idBtvsProc = Channel(DEVICE+':IST3:2', type = 'd')
 
 #Dimension 1
 #PseudoPositioner idX
@@ -79,3 +91,5 @@ idBtvsRaw.close()
 idBtvsProc.close()
 
 scan.end()
+ret = 'Test done'
+status = True