diff --git a/components/modbus/modbus_client.cpp b/components/modbus/modbus_client.cpp
index 6a62969..647e59b 100644
--- a/components/modbus/modbus_client.cpp
+++ b/components/modbus/modbus_client.cpp
@@ -6,10 +6,10 @@
 #include "sdk\os\delay.hpp"
 using namespace iflytop;
 
-static uint8_t modbus_rx_buf[256];
-static uint8_t modbus_tx_buf[256];
+static uint8_t modbus_rx_buf[255];
+static uint8_t modbus_tx_buf[255];
 static bool    modbus_rx_is_ready = false;
-static int     modbus_rx_size     = 256;
+static int     modbus_rx_size     = 0;
 
 static void modbux_tx(uint8_t* rx, uint16_t len) { ModulebusClient::Inst()->sendpacket(rx, len); }
 static void modbux_process_rx(modbus_processer_context_t* context) { ModulebusClient::Inst()->process_rx_packet(context); }
@@ -36,7 +36,7 @@ void ModulebusClient::init(ZIUartReceiver* receiver, ZIUartSender* sender, int d
 
   receiver->startRx([this](uint8_t* data, size_t len) {  //
     if (modbus_rx_is_ready) return;
-    if (len > 256) return;
+    if (len > 255) return;
     memcpy(modbus_rx_buf, data, len);
     modbus_rx_size     = len;
     modbus_rx_is_ready = true;
diff --git a/components/modbus/modbus_processer.hpp b/components/modbus/modbus_processer.hpp
index 1a7b51f..abc54c7 100644
--- a/components/modbus/modbus_processer.hpp
+++ b/components/modbus/modbus_processer.hpp
@@ -12,10 +12,10 @@ typedef struct modbus_processer {
   uint8_t modbus_device_id;  // default 0x01;
 
   uint8_t* modbus_processer_rx_buf;
-  int  modbus_processer_rx_buf_size;  //
+  uint8_t  modbus_processer_rx_buf_size;  //
 
   uint8_t* modbus_processer_tx_buf;
-  int  modbus_processer_tx_buf_size;  //
+  uint8_t  modbus_processer_tx_buf_size;  //
 
   /*************************************/
   void (*tx)(uint8_t* rx, uint16_t len);
diff --git a/components/sub_modbus_module/sub_modbus_board_initer.cpp b/components/sub_modbus_module/sub_modbus_board_initer.cpp
new file mode 100644
index 0000000..23570b9
--- /dev/null
+++ b/components/sub_modbus_module/sub_modbus_board_initer.cpp
@@ -0,0 +1,63 @@
+#include "sub_modbus_board_initer.hpp"
+
+//
+#include <stdio.h>
+#include <string.h>
+
+#include "project_configs.h"
+
+using namespace iflytop;
+#define TAG  "main"
+
+extern DMA_HandleTypeDef PC_DEBUG_UART_DMA_HANDLER;
+extern DMA_HandleTypeDef PC_MODBUS_UART_DMA_HANDLER;
+
+class UARTSender : public ZIUartSender {
+  UART_HandleTypeDef* m_huart;
+
+ public:
+  void         init(UART_HandleTypeDef* huart) { m_huart = huart; }
+  virtual void send(const uint8_t* data, size_t len) { HAL_UART_Transmit(m_huart, (uint8_t*)data, len, 1000); }
+};
+
+void SubModbusBoardIniter::init(int              deviceId,         //
+                                function<void()> subModuleIniter,  //
+                                on_reg_read_t    regreadcb,        //
+                                on_reg_write_t   regwritecb) {
+  chip_cfg_t chipcfg            = {};
+  chipcfg.us_dleay_tim          = &PC_SYS_DELAY_US_TIMER;
+  chipcfg.tim_irq_scheduler_tim = &PC_SYS_TIM_IRQ_SCHEDULER_TIMER;
+  chipcfg.huart                 = &PC_DEBUG_UART;
+  chipcfg.debuglight            = PC_DEBUG_LIGHT_GPIO;
+
+  chip_init(&chipcfg);
+
+  zos_cfg_t zoscfg;
+  zos_init(&zoscfg);
+
+  ZLOGI(TAG, "boardId:%d", deviceId);
+
+  if (subModuleIniter) {
+    subModuleIniter();
+  }
+
+  static ZUARTDmaReceiver                    dmaUartReceiver;
+  static ZUARTDmaReceiver::hardware_config_t cfg = {
+      .huart         = &PC_MODBUS_UART,
+      .dma_rx        = &PC_MODBUS_UART_DMA_HANDLER,
+      .rxbuffersize  = PC_MODBUS_UART_RX_BUF_SIZE,
+      .rxovertime_ms = 1,
+  };
+  dmaUartReceiver.initialize(&cfg);
+
+  static UARTSender uartSender;
+  uartSender.init(&PC_MODBUS_UART);
+
+  ModulebusClient::Inst()->init(&dmaUartReceiver, &uartSender, deviceId, regreadcb, regwritecb);
+}
+void SubModbusBoardIniter::loop() {
+  while (true) {
+    OSDefaultSchduler::getInstance()->loop();
+    ModulebusClient::Inst()->loop();
+  }
+}
diff --git a/components/sub_modbus_module/sub_modbus_board_initer.hpp b/components/sub_modbus_module/sub_modbus_board_initer.hpp
new file mode 100644
index 0000000..e748380
--- /dev/null
+++ b/components/sub_modbus_module/sub_modbus_board_initer.hpp
@@ -0,0 +1,26 @@
+#pragma once
+#include "sdk/os/zos.hpp"
+#include "sdk\components\cmdscheduler\cmd_scheduler_v2.hpp"
+#include "sdk\components\hardware\uart\zuart_dma_receiver.hpp"
+#include "sdk\components\zcancmder\zcan_board_module.hpp"
+#include "sdk\components\zcancmder\zcanreceiver.hpp"
+#include "sdk\components\zprotocol_helper\micro_computer_module_device_script_cmder_paser.hpp"
+#include "sdk\components\zprotocols\zcancmder_v2\protocol_event_bus_sender.hpp"
+#include "sdk\components\zprotocols\zcancmder_v2\protocol_parser.hpp"
+#include "sdk\components\zprotocols\zcancmder_v2\zmodule_device_manager.hpp"
+//
+#include "sdk\components\modbus\modbus_client.hpp"
+
+namespace iflytop {
+
+class SubModbusBoardIniter {
+ public:
+  void init(int              deviceId,         //
+            function<void()> subModuleIniter,  //
+            on_reg_read_t    regreadcb,        //
+            on_reg_write_t   regwritecb);
+  void loop();
+
+ private:
+};
+}  // namespace iflytop
\ No newline at end of file