diff --git a/site_ansto/instrument/pelican/config/beamline/sct_power.tcl b/site_ansto/instrument/pelican/config/beamline/sct_power.tcl
index ac266fd2..921c8277 100644
--- a/site_ansto/instrument/pelican/config/beamline/sct_power.tcl
+++ b/site_ansto/instrument/pelican/config/beamline/sct_power.tcl
@@ -345,6 +345,10 @@ proc ::scobj::ag1010::rdValue {} {
   #set ns [sct]
   if {[ catch {
       set data [string trim [sct result] " "]
+      if {[string length $data] < 1} {
+        broadcast "Error in rdValue: no message returned from device"
+        return -code error "Error in rdValue: no message returned from device"
+      }
       set ctrlCode [format %d 0x[string range $data 4 5]]
 
       switch -glob $ctrlCode {
@@ -1121,8 +1125,8 @@ publish LFGetMEAS         user
 # IP 137.157.202.219
 ::scobj::ag1010::mkAG {
   name "ag1010"
-  IP 137.157.202.219 
-  PORT 4001 
+  IP localhost 
+  PORT 50001 
   tuning 1
   interval 5
 }