edit

modbus_tk/modbus.py

@@ -156,8 +156,8 @@ class Master(object):
         """
 
         if isinstance(function_code, str):
-            #request = bytes.fromhex(function_code)
-            request = function_code.encode()
+            request = bytes.fromhex(function_code)
+            #request = function_code.encode()
             response = self._handle(request, expected_length);
             return self._result(response)