diff --git a/site_ansto/instrument/bilby/config/chopper/astrium_chopper.sct b/site_ansto/instrument/bilby/config/chopper/astrium_chopper.sct
index a25a2902..64e4bd47 100644
--- a/site_ansto/instrument/bilby/config/chopper/astrium_chopper.sct
+++ b/site_ansto/instrument/bilby/config/chopper/astrium_chopper.sct
@@ -2,7 +2,7 @@ driver astrium_chopper = {
   vendor = astrium; device = chopper; protocol = std;
   class = NXdisk_chopper; simulation_group = chopper_simulation;
 
-  group blade_1 = {
+  group disk_1 = {
     var state = {
       type = text; mutable = true; priv = user; readable = 1;
       read_command = '1'; fetch_function = fetchState; read_function = readState;
@@ -13,9 +13,10 @@ driver astrium_chopper = {
     var aspeed = { type = float; mutable = true; }
     var rphase = { type = float; }
     var aphase = { type = float; mutable = true; }
+    var frequency = { type = float; mutable = true; }
   }
 
-  group blade_2 = {
+  group disk_2 = {
     var state = {
       type = text; mutable = true; priv = user; readable = 1;
       read_command = '2'; fetch_function = fetchState; read_function = readState;
@@ -26,9 +27,10 @@ driver astrium_chopper = {
     var aspeed = { type = float; mutable = true; }
     var rphase = { type = float; }
     var aphase = { type = float; mutable = true; }
+    var frequency = { type = float; mutable = true; }
   }
 
-  group blade_3 = {
+  group disk_3 = {
     var state = {
       type = text; mutable = true; priv = user; readable = 1;
       read_command = '3'; fetch_function = fetchState; read_function = readState;
@@ -39,9 +41,10 @@ driver astrium_chopper = {
     var aspeed = { type = float; mutable = true; }
     var rphase = { type = float; }
     var aphase = { type = float; mutable = true; }
+    var frequency = { type = float; mutable = true; }
   }
 
-  group blade_4 = {
+  group disk_4 = {
     var state = {
       type = text; mutable = true; priv = user; readable = 1;
       read_command = '4'; fetch_function = fetchState; read_function = readState;
@@ -52,6 +55,7 @@ driver astrium_chopper = {
     var aspeed = { type = float; mutable = true; }
     var rphase = { type = float; }
     var aphase = { type = float; mutable = true; }
+    var frequency = { type = float; mutable = true; }
   }
 
   code fetch_function fetchState = {%%
@@ -87,8 +91,16 @@ driver astrium_chopper = {
             set rhs "[string trim [lindex ${lst} 1]]"
             sct "attr_${lhs}" "${rhs}"
             set base [pathname [sct]]
-            foreach node [list ASPEED RSPEED APHASE RPHASE MASTER] {
-              if { [string equal -nocase "${lhs}" "${node}"] } {
+            switch [string toupper ${lhs}] {
+              "ASPEED" {
+                if [string is double "${rhs}"] {
+                  set freq [expr "${rhs}" / 60.0]
+                  if { "[hval ${base}/frequency]" != "${freq}" } {
+                    hset ${base}/frequency ${freq}
+                  }
+                }
+              }
+              "RSPEED" - "APHASE" - "RPHASE" - "MASTER" {
                 if { "[hval ${base}/${node}]" != "${rhs}" } {
                   hset ${base}/${node} "${rhs}"
                 }
diff --git a/site_ansto/instrument/config/beamline/he3_polanal.sct b/site_ansto/instrument/config/beamline/he3_polanal.sct
index 68ba2a24..b0f784c0 100644
--- a/site_ansto/instrument/config/beamline/he3_polanal.sct
+++ b/site_ansto/instrument/config/beamline/he3_polanal.sct
@@ -16,14 +16,14 @@ driver he3_polanal = {
       writeable = 1;
       write_command = 'polariser';
       check_function = chkWrite;
-      allowed = "+,-,Refresh"
+      allowed = "-1,0,+1"
     }
     var amplitude = { }
     var freq = { units = 'Hertz'; }
     var phase = { units = 'Degree'; }
     var time2 = { units = 'Second'; }
     var field = { units = 'Oersted'; }
-    var timestamp = { }
+    var timestamp = { type = int; }
   }
   group polariser_start = {
     conditional = '[string equal -nocase ${has_pol} "true"]';
@@ -34,7 +34,7 @@ driver he3_polanal = {
     var phase = { units = 'Degree'; }
     var time2 = { units = 'Second'; }
     var field = { units = 'Oersted'; }
-    var timestamp = { }
+    var timestamp = { type = int; }
   }
 
   group analyser = {
@@ -54,7 +54,7 @@ driver he3_polanal = {
     var phase = { units = 'Degree'; }
     var time2 = { units = 'Second'; }
     var field = { units = 'Oersted'; }
-    var timestamp = { }
+    var timestamp = { type = int; }
   }
   group analyser_start = {
     conditional = '[string equal -nocase ${has_anal} "true"]';
@@ -65,7 +65,7 @@ driver he3_polanal = {
     var phase = { units = 'Degree'; }
     var time2 = { units = 'Second'; }
     var field = { units = 'Oersted'; }
-    var timestamp = { }
+    var timestamp = { type = int; }
   }
 
   code chkWrite = {%%
@@ -103,27 +103,9 @@ driver he3_polanal = {
 
   code setValue = {%%
     set cmd "${cmd_str}"
-    if {[string equal -nocase [sct target] "refresh"]} {
-      set cmd "${cmd_str}"
-    }
-    if {[string equal -nocase [sct target] "minus"]} {
-      set cmd "${cmd_str} -"
-    }
-    if {[string equal -nocase [sct target] "dn"]} {
-      set cmd "${cmd_str} -"
-    }
-    if {[string equal -nocase [sct target] "down"]} {
-      set cmd "${cmd_str} -"
-    }
     if {[sct target] == "-" || [sct target] == -1} {
       set cmd "${cmd_str} -"
     }
-    if {[string equal -nocase [sct target] "plus"]} {
-      set cmd "${cmd_str} +"
-    }
-    if {[string equal -nocase [sct target] "up"]} {
-      set cmd "${cmd_str} +"
-    }
     if {[sct target] == "+" || [sct target] == 1} {
       set cmd "${cmd_str} +"
     }
diff --git a/site_ansto/instrument/config/environment/isotech_ps.sct b/site_ansto/instrument/config/environment/isotech_ps.sct
index b50e60e7..ea3672f4 100644
--- a/site_ansto/instrument/config/environment/isotech_ps.sct
+++ b/site_ansto/instrument/config/environment/isotech_ps.sct
@@ -5,7 +5,7 @@ driver isotech_ps = {
   vendor = isotech; device = ps; protocol = std;
   class = environment;
   simulation_group = environment_simulation;
-  protocol_args = '{terminator "\r"}';
+  protocol_args = '{terminator \r}';
   group = {
     readable = 5
     mutable = true