diff --git a/site_ansto/instrument/pelican/config/chopper/sct_fermichopper.tcl b/site_ansto/instrument/pelican/config/chopper/sct_fermichopper.tcl
index 43260099..c61840da 100644
--- a/site_ansto/instrument/pelican/config/chopper/sct_fermichopper.tcl
+++ b/site_ansto/instrument/pelican/config/chopper/sct_fermichopper.tcl
@@ -31,7 +31,11 @@ namespace eval ::scobj::chopper {
     if {$val != $oldval} {
       sct update 1
       hsetprop $chPath P_oldval $val
-      binary scan [binary format c $val] B* binNum
+      if {$statnode == "intlck_status" } {
+        binary scan [binary format S $val] B16 binNum
+      } else {
+        binary scan [binary format c $val] B8  binNum
+      }
       set bitfield [split $binNum ""]
       foreach n $fields b $bitfield {
         hset $chPath/$n $b