diff --git a/src/meshcore/lpp_json_encoder.py b/src/meshcore/lpp_json_encoder.py
index 6b330c0..53828c1 100644
--- a/src/meshcore/lpp_json_encoder.py
+++ b/src/meshcore/lpp_json_encoder.py
@@ -1,7 +1,7 @@
 from cayennelpp import LppFrame, LppData
 from cayennelpp.lpp_type import LppType
 
-# type name "how to display vale"
+# Format : type name "how to display value"
 #   display : None: (use lib default), []: only one value to display, ["field1", "field2" ...]: meaning of each field 
 my_lpp_types = {
     0:      ('digital input', []),
@@ -33,7 +33,7 @@ my_lpp_types = {
     142:    ('switch', []),
 }
 
-def lpp_json_encoder (obj) :
+def lpp_json_encoder (obj, types = my_lpp_types) :
     """Encode LppType, LppData, and LppFrame to JSON."""
     if isinstance(obj, LppFrame):
         return obj.data
@@ -53,4 +53,4 @@ def lpp_json_encoder (obj) :
                 i = i + 1
             d["value"] = val_dict
         return d
-    raise TypeError(repr(obj) + " is not JSON serialized")
\ No newline at end of file
+    raise TypeError(repr(obj) + " is not JSON serialized")