diff --git a/site_ansto/instrument/bilby/config/chopper/astrium_chopper.sct b/site_ansto/instrument/bilby/config/chopper/astrium_chopper.sct
index 0c9cc615..64e4bd47 100644
--- a/site_ansto/instrument/bilby/config/chopper/astrium_chopper.sct
+++ b/site_ansto/instrument/bilby/config/chopper/astrium_chopper.sct
@@ -91,7 +91,7 @@ driver astrium_chopper = {
             set rhs "[string trim [lindex ${lst} 1]]"
             sct "attr_${lhs}" "${rhs}"
             set base [pathname [sct]]
-            switch [string toupper [string trim ${node}]] {
+            switch [string toupper ${lhs}] {
               "ASPEED" {
                 if [string is double "${rhs}"] {
                   set freq [expr "${rhs}" / 60.0]
@@ -100,7 +100,7 @@ driver astrium_chopper = {
                   }
                 }
               }
-              "RSPEED" "APHASE" "RPHASE" "MASTER" {
+              "RSPEED" - "APHASE" - "RPHASE" - "MASTER" {
                 if { "[hval ${base}/${node}]" != "${rhs}" } {
                   hset ${base}/${node} "${rhs}"
                 }
diff --git a/site_ansto/instrument/bilby/config/chopper/astrium_chopper_sct.tcl b/site_ansto/instrument/bilby/config/chopper/astrium_chopper_sct.tcl
index f77c8380..b01e07d2 100644
--- a/site_ansto/instrument/bilby/config/chopper/astrium_chopper_sct.tcl
+++ b/site_ansto/instrument/bilby/config/chopper/astrium_chopper_sct.tcl
@@ -174,7 +174,7 @@ proc ::scobj::astrium_chopper::readState {tc_root} {
             set rhs "[string trim [lindex ${lst} 1]]"
             sct "attr_${lhs}" "${rhs}"
             set base [pathname [sct]]
-            switch [string toupper [string trim ${node}]] {
+            switch [string toupper ${lhs}] {
               "ASPEED" {
                 if [string is double "${rhs}"] {
                   set freq [expr "${rhs}" / 60.0]
@@ -183,7 +183,7 @@ proc ::scobj::astrium_chopper::readState {tc_root} {
                   }
                 }
               }
-              "RSPEED" "APHASE" "RPHASE" "MASTER" {
+              "RSPEED" - "APHASE" - "RPHASE" - "MASTER" {
                 if { "[hval ${base}/${node}]" != "${rhs}" } {
                   hset ${base}/${node} "${rhs}"
                 }