diff --git a/api/zi_event_bus.hpp b/api/zi_event_bus.hpp
index 6a7b9a9..549bca3 100644
--- a/api/zi_event_bus.hpp
+++ b/api/zi_event_bus.hpp
@@ -8,9 +8,9 @@
 namespace iflytop {
 using namespace std;
 
-typedef enum {
-  kreg_change_event = 1,
-} event_type_t;
+// typedef enum {
+//   kreg_change_event = 1,
+// } event_type_t;
 
 class ZIEventBusSender {
  public:
@@ -20,6 +20,6 @@ class ZIEventBusSender {
    *
    * @param moduleid
    */
-  virtual void push_reg_state_change_event(int32_t moduleid, int32_t regindex, int32_t toval) = 0;
+  virtual void push_reg_state_change_event(int32_t moduleid, int32_t regindex, int32_t oldval, int32_t toval) = 0;
 };
 }  // namespace iflytop
diff --git a/protocol_event_bus_sender.cpp b/protocol_event_bus_sender.cpp
index 2b7dd7e..6629b64 100644
--- a/protocol_event_bus_sender.cpp
+++ b/protocol_event_bus_sender.cpp
@@ -1,19 +1,24 @@
 #include "protocol_event_bus_sender.hpp"
 
 #include "api/api.hpp"
+#include "cmdid.hpp"
 namespace iflytop {
 using namespace std;
 
 void ProtocolEventBusSender::initialize(IZCanCmder* zcan_cmder) { m_zcan_cmder = zcan_cmder; }
 
-void ProtocolEventBusSender::push_reg_state_change_event(int32_t moduleid, int32_t event_id, int32_t eventval) {
-  zcr_cmd_header_t rx_cmd_header = {0};
-  int32_t          data[4];
-  data[0] = kreg_change_event;
-  data[1] = moduleid;
-  data[2] = event_id;
-  data[3] = eventval;
-  m_zcan_cmder->triggerEvent(&rx_cmd_header, (uint8_t*)data, sizeof(data));
+void ProtocolEventBusSender::push_reg_state_change_event(int32_t moduleid, int32_t regindex, int32_t oldval, int32_t toval) {
+  zcr_cmd_header_t cmd_header = {0};
+  int32_t          data[3];
+
+  cmd_header.cmdmoduleid = moduleid;
+  cmd_header.cmdmoduleid = zcr::kevent_bus_reg_change_report >> 8;
+  cmd_header.submoduleid = zcr::kevent_bus_reg_change_report & 0xff;
+
+  data[1] = regindex;
+  data[2] = oldval;
+  data[3] = toval;
+  m_zcan_cmder->triggerEvent(&cmd_header, (uint8_t*)data, sizeof(data));
 }
 
 }  // namespace iflytop
\ No newline at end of file
diff --git a/protocol_event_bus_sender.hpp b/protocol_event_bus_sender.hpp
index c8b66aa..8fe347e 100644
--- a/protocol_event_bus_sender.hpp
+++ b/protocol_event_bus_sender.hpp
@@ -8,6 +8,6 @@ class ProtocolEventBusSender : public ZIEventBusSender {
  public:
   void initialize(IZCanCmder* zcan_cmder);
 
-  virtual void push_reg_state_change_event(int32_t moduleid, int32_t event_id, int32_t eventval) override;
+  virtual void push_reg_state_change_event(int32_t moduleid, int32_t regindex, int32_t oldval, int32_t toval) override;
 };
 }  // namespace iflytop
\ No newline at end of file
diff --git a/zmodule_device_manager.cpp b/zmodule_device_manager.cpp
index 36eabeb..7f61626 100644
--- a/zmodule_device_manager.cpp
+++ b/zmodule_device_manager.cpp
@@ -18,15 +18,12 @@ void ZModuleDeviceManager::initialize(IZcanCmderMaster *cancmder) {
   // assert(m_cancmder != nullptr);
   if (m_cancmder) {
     m_cancmder->regEventPacketListener([this](int32_t fromboard, zcr_cmd_header_t *packet, int32_t datalen) {
-      if (datalen < 4) return;
-
-      int32_t *pdata = (int32_t *)packet->data;
-      int32_t  event = pdata[0];
-      if (event == kreg_change_event) {
-        int32_t moduleid = pdata[1];
-        int32_t event_id = pdata[2];
-        int32_t eventval = pdata[3];
-        callOnRegValChangeEvent(moduleid, event_id, eventval);
+      if (CMDID(packet->cmdmoduleid, packet->subcmdid) == zcr::kevent_bus_reg_change_report) {
+        int32_t *pdata    = (int32_t *)packet->data;
+        int32_t  regindex = pdata[0];
+        int32_t  regold   = pdata[1];
+        int32_t  regnew   = pdata[2];
+        callOnRegValChangeEvent(packet->cmdmoduleid, regindex, regold, regnew);
       }
     });
   }
diff --git a/zmodule_device_manager.hpp b/zmodule_device_manager.hpp
index eedca7a..708c1b5 100644
--- a/zmodule_device_manager.hpp
+++ b/zmodule_device_manager.hpp
@@ -13,7 +13,7 @@ class ZModuleDeviceManager {
   map<uint16_t, ZIModule *> m_modulers;
   IZcanCmderMaster         *m_cancmder = nullptr;
 
-  typedef function<void(int32_t moduleid, int32_t event_id, int32_t eventval)> regval_change_event_t;
+  typedef function<void(int32_t moduleid, int32_t regindex, int32_t oldval, int32_t toval)> regval_change_event_t;
 
   regval_change_event_t       m_on_reg_val_change_event_cb;
   list<regval_change_event_t> m_on_reg_val_change_event_cbs;
@@ -23,9 +23,9 @@ class ZModuleDeviceManager {
   void registerModule(ZIModule *module);
 
   void regOnRegValChangeEvent(regval_change_event_t on_regval_change_event) { m_on_reg_val_change_event_cbs.push_back(on_regval_change_event); }
-  void callOnRegValChangeEvent(int32_t moduleid, int32_t event_id, int32_t eventval) {
+  void callOnRegValChangeEvent(int32_t moduleid, int32_t regindex, int32_t oldval, int32_t toval) {
     for (auto &cb : m_on_reg_val_change_event_cbs)
-      if (cb) cb(moduleid, event_id, eventval);
+      if (cb) cb(moduleid, regindex, oldval,toval);
   }
 
   void for_each_module(function<void(int32_t moduleid)> cb) {