diff --git a/site_ansto/instrument/util/gen_sct.py b/site_ansto/instrument/util/gen_sct.py
index 56bf65cf..7734ea71 100755
--- a/site_ansto/instrument/util/gen_sct.py
+++ b/site_ansto/instrument/util/gen_sct.py
@@ -156,6 +156,8 @@ tokens = [
     'ID',
     'TCL_BEG',
     'TCL_END',
+    'AT_TCL',
+    'AT_END',
     ] + list(reserved.values())
 
 #
@@ -167,6 +169,20 @@ t_LBRACE = r'{'
 t_RBRACE = r'}'
 t_SLASH = r'/'
 
+def t_AT_TCL(t):
+    r'@TCL'
+    if Verbose:
+        print 'AT_TCL'
+    t.lexer.begin('tcl')
+    #return t
+
+def t_tcl_AT_END(t):
+    r'[ \t]*@END'
+    if Verbose:
+        print 'AT_END'
+    t.lexer.begin('INITIAL')
+    #return t
+
 def t_TCL_BEG(t):
     r'{%%'
     if Verbose:
@@ -513,6 +529,7 @@ def p_true_false(p):
 def p_code(p):
     '''
     code : CODE code_type id_or_str EQUALS LBRACE code_block RBRACE
+         | CODE code_type id_or_str EQUALS LBRACE tcl_code_block RBRACE
          | CODE code_type id_or_str EQUALS TCL_BEG code_block TCL_END
     '''
     p[0] = { 'Code' : { 'name' : p[3], 'type' : p[2], 'text' : p[6] }}
@@ -532,6 +549,12 @@ def p_code_type(p):
     '''
     p[0] = p[1]
 
+def p_tcl_code_block(p):
+    '''
+    tcl_code_block : AT_TCL code_block AT_END
+    '''
+    p[0] = p[2]
+
 def p_code_block(p):
     '''code_block : empty
                   | code_block CODE_STRING