diff --git a/hgdriver/hgdev/hg_scanner_239.cpp b/hgdriver/hgdev/hg_scanner_239.cpp
index e9f26a5..d2d9195 100644
--- a/hgdriver/hgdev/hg_scanner_239.cpp
+++ b/hgdriver/hgdev/hg_scanner_239.cpp
@@ -1462,13 +1462,17 @@ std::string hg_scanner_239::get_serial_num(void)
 	std::lock_guard<std::mutex>      lock(io_lock_);
 	int len = 0;
 	read_register(setting3399::SR_GET_SERIAL_LEN, &len);///???
+	if (len > 30)
+	{
+		len = 30;
+	}
 	return control_fetch(setting3399::SR_GET_SERIALNUM, 0, len).substr(0,len);
 }
 std::string hg_scanner_239::get_ip(void)
 {
 	std::lock_guard<std::mutex>      lock(io_lock_);
-	int len = 0;
-	read_register(setting3399::SR_GET_SERIAL_LEN, &len);
+	int len = 20;
+	//read_register(setting3399::SR_GET_SERIAL_LEN, &len);
 	return control_fetch(setting3399::SR_GET_IPADDR, 0, len);
 }
 std::string hg_scanner_239::get_device_model(void)
diff --git a/hgdriver/hgdev/scanner_manager.cpp b/hgdriver/hgdev/scanner_manager.cpp
index 36df927..506dc01 100644
--- a/hgdriver/hgdev/scanner_manager.cpp
+++ b/hgdriver/hgdev/scanner_manager.cpp
@@ -53,10 +53,18 @@ g_supporting_devices[] = {
                          , {0x2903, 0x8000, SCANNER_NAME_HW_8000, SCANNER_NAME_HW_8000, "", &hg_scanner_mgr::create_scanner_g239}   // "HW-8090F" 
                          , {0x2903, 0x9000, SCANNER_NAME_HW_9000, SCANNER_NAME_HW_9000, "", &hg_scanner_mgr::create_scanner_g239}   // "HW-9110E" 
 #elif defined(OEM_CANGTIAN)
-                           {0x3308, 0x6006, SCANNER_NAME_CT_9020, SCANNER_NAME_CT_9020, "", &hg_scanner_mgr::create_scanner_g239}
+                           {0x3072, 0x0303, SCANNER_NAME_CT_4520, SCANNER_NAME_CT_4520, "", &hg_scanner_mgr::create_scanner_g300}
+                         , {0x3072, 0x0403, SCANNER_NAME_CT_138, SCANNER_NAME_CT_138, "", &hg_scanner_mgr::create_scanner_g439}
+                         , {0x3072, 0x0138, SCANNER_NAME_CT_138, SCANNER_NAME_CT_138, "", &hg_scanner_mgr::create_scanner_g239}
+                         , {0x3072, 0x0238, SCANNER_NAME_CT_138, SCANNER_NAME_CT_138, "", &hg_scanner_mgr::create_scanner_g239}
+
+                         , {0x3308, 0x0138, SCANNER_NAME_CT_138, SCANNER_NAME_CT_138, "", &hg_scanner_mgr::create_scanner_g239}
+                         , {0x3308, 0x0238, SCANNER_NAME_CT_238, SCANNER_NAME_CT_238, "", &hg_scanner_mgr::create_scanner_g239}
+                         , {0x3308, 0x6006, SCANNER_NAME_CT_9020, SCANNER_NAME_CT_9020, "", &hg_scanner_mgr::create_scanner_g239}
                          , {0x3308, 0x6005, SCANNER_NAME_CT_4520, SCANNER_NAME_CT_4520, "", &hg_scanner_mgr::create_scanner_g300}
-                         , {0x3308, 0x0238, SCANNER_NAME_CT_138, SCANNER_NAME_CT_138, "", &hg_scanner_mgr::create_scanner_g239}
-                         , {0x3308, 0x0138, SCANNER_NAME_CT_238, SCANNER_NAME_CT_238, "", &hg_scanner_mgr::create_scanner_g239}
+                        
+
+                         
 #elif defined(OEM_ZHONGJING)
                            {0X05DA, 0x9220, SCANNER_NAME_ZJ_6500, "S6500", "",& hg_scanner_mgr::create_scanner_g439}
 #elif defined(OEM_ZIGUANG)
@@ -90,6 +98,7 @@ g_supporting_devices[] = {
                          , {0x3308, 0x6005, SCANNER_NAME_CT_4520, SCANNER_NAME_CT_4520, "", &hg_scanner_mgr::create_scanner_g300}
                          , {0x3308, 0x0238, SCANNER_NAME_CT_138, SCANNER_NAME_CT_138, "", &hg_scanner_mgr::create_scanner_g239}
                          , {0x3308, 0x0138, SCANNER_NAME_CT_238, SCANNER_NAME_CT_238, "", &hg_scanner_mgr::create_scanner_g239}
+                         , {0x3072, 0x0303, SCANNER_NAME_CT_4520, SCANNER_NAME_CT_4520, "", &hg_scanner_mgr::create_scanner_g300}
 #else
                            {0x3072, PID_AND_NAME(100, SCANNER_NAME_HG_G100), "G100", "", &hg_scanner_mgr::create_scanner_g100}
                          , {0x3072, PID_AND_NAME(139, SCANNER_NAME_HG_G100), "G100", "", &hg_scanner_mgr::create_scanner_g239}