diff --git a/iflytop_canbus_protocol.hpp b/iflytop_canbus_protocol.hpp
index a12d737..877d50a 100644
--- a/iflytop_canbus_protocol.hpp
+++ b/iflytop_canbus_protocol.hpp
@@ -1,7 +1,7 @@
 #pragma once
 #include <stdint.h>
 
-#define PROTOCOL_VERSION 1
+#define PROTOCOL_VERSION 2
 #define HEART_OVERTIME   (30 * 1000)
 
 extern "C" {
@@ -151,6 +151,7 @@ typedef enum {
   kcmd_pump_stop                  = 101,  // cmd: index rpm                 ack:none
   kcmd_pump_set_ihold_irun_idelay = 102,  // cmd: index irun,ihold,idelay   ack:none
   kcmd_pump_set_acc               = 104,  // cmd: index acc                 ack:none
+  kcmd_pump_ping                  = 105,  // cmd: index,                    ack:none
 
   kcmd_pump_set_subic_reg = 110,  // cmd: index,val   ack:none
   kcmd_pump_get_subic_reg = 111,  // cmd: index,      ack:val