diff --git a/iflytop_canbus_protocol.hpp b/iflytop_canbus_protocol.hpp
index 3211cbd..9459dc8 100644
--- a/iflytop_canbus_protocol.hpp
+++ b/iflytop_canbus_protocol.hpp
@@ -103,11 +103,12 @@ static inline const char *ProjectIDToString(uint32_t id) {
 }
 
 typedef enum {
-  kerr_noerror           = 0,
-  kerr_overtime          = 1,
-  kerr_invalid_param     = 2,
-  kerr_invalid_param_num = 3,
-  kerr_subdevice_offline = 4,
+  kerr_noerror              = 0,
+  kerr_overtime             = 1,
+  kerr_invalid_param        = 2,
+  kerr_invalid_param_num    = 3,
+  kerr_subdevice_offline    = 4,
+  kerr_function_not_support = 5,
 
   // 驱动器错误
   kerr_motor_reset_error        = 100,
@@ -135,6 +136,8 @@ static inline const char *ErrorCodeToString(uint32_t code) {
       return "invalid_param_num";
     case kerr_subdevice_offline:
       return "subdevice_offline";
+    case kerr_function_not_support:
+      return "function_not_support";
     case kerr_motor_reset_error:
       return "motor_reset_error";
     case kerr_motor_subdevice_offline: