diff --git a/site_ansto/instrument/bilby/config/chopper/chopper.tcl b/site_ansto/instrument/bilby/config/chopper/chopper.tcl
index 4a6e0744..54cdfa05 100644
--- a/site_ansto/instrument/bilby/config/chopper/chopper.tcl
+++ b/site_ansto/instrument/bilby/config/chopper/chopper.tcl
@@ -4,16 +4,22 @@ namespace eval chopper {
   set master_chopper_id_simvar 1
 }
 
+if {$sim_mode == false} {
+  MakeAsyncProtocol std
+  MakeAsyncQueue chopsel std chopsel1-bilby 30000
+}
 ::utility::macro::getset int master_chopper_id {args} {
   variable sim_mode [SplitReply [chopper_simulation]]
   
-  if {$sim_mode == "false"} {
+  if {$sim_mode == false} {
     if {$args == ""} {
-      return "master_chopper_id = [sct_chopper_t0 transact {get master chopper}]"
+      chopsel send {get master chopper}
+      return "master_chopper_id = [SplitReply [chopsel send {get master chopper}]]"
     } else {
-      sct_chopper_t0 transact "enable chopper selection"
-      sct_chopper_t0 transact "set master chopper=$args"
-      sct_chopper_t0 transact "disable chopper selection"
+      chopsel send "get master chopper"
+      chopsel send "enable chopper selection"
+      chopsel send "set master chopper=$args"
+      chopsel send "disable chopper selection"
     }
   } else {
     if {$args == ""} {