diff --git a/Cardiopulmonarybypasssystems/Models/Rs485SerialSettings.cs b/Cardiopulmonarybypasssystems/Models/Rs485SerialSettings.cs
index 5d18793..4f13c16 100644
--- a/Cardiopulmonarybypasssystems/Models/Rs485SerialSettings.cs
+++ b/Cardiopulmonarybypasssystems/Models/Rs485SerialSettings.cs
@@ -2,7 +2,7 @@ namespace Cardiopulmonarybypasssystems.Models;
 
 public sealed class Rs485SerialSettings
 {
-    public string PortName { get; set; } = "COM3";
+    public string PortName { get; set; } = "COM9";
     public int BaudRate { get; set; } = 9600;
     public string Parity { get; set; } = "Even";
     public int DataBits { get; set; } = 8;
diff --git a/Cardiopulmonarybypasssystems/ViewModels/MainViewModel.Rs485.cs b/Cardiopulmonarybypasssystems/ViewModels/MainViewModel.Rs485.cs
index 25d3539..798e9a8 100644
--- a/Cardiopulmonarybypasssystems/ViewModels/MainViewModel.Rs485.cs
+++ b/Cardiopulmonarybypasssystems/ViewModels/MainViewModel.Rs485.cs
@@ -29,7 +29,7 @@ public partial class MainViewModel
     private const int MaxRs485MotorCommand = short.MaxValue;
 
     [ObservableProperty]
-    private string rs485PortName = "COM3";
+    private string rs485PortName = "COM9";
 
     [ObservableProperty]
     private int rs485BaudRate = 9600;
diff --git a/Cardiopulmonarybypasssystems/ViewModels/MainViewModel.cs b/Cardiopulmonarybypasssystems/ViewModels/MainViewModel.cs
index 3543c83..5570c79 100644
--- a/Cardiopulmonarybypasssystems/ViewModels/MainViewModel.cs
+++ b/Cardiopulmonarybypasssystems/ViewModels/MainViewModel.cs
@@ -1801,6 +1801,14 @@ public partial class MainViewModel : ObservableObject, IDisposable
 
     private ObservableCollection<EngineeringRegisterItem> BuildEngineeringRegisters() =>
     [
+        CreateEngineeringRegister("流量系数1", 1006, true),
+        CreateEngineeringRegister("流量系数2", 1016, true),
+        CreateEngineeringRegister("流量系数3", 1026, true),
+        CreateEngineeringRegister("流量系数4", 1036, true),
+        CreateEngineeringRegister("流量系数5", 1046, true),
+        CreateEngineeringRegister("流量系数6", 1056, true),
+        CreateEngineeringRegister("流量系数7", 1066, true),
+        CreateEngineeringRegister("流量系数8", 1076, true),
         CreateEngineeringRegister("近端压力系数", 1328, true),
         CreateEngineeringRegister("远端压力系数", 1378, true),
         CreateEngineeringRegister("近端压力显示", 1330, false, usesFloatDisplay: true),
diff --git a/Cardiopulmonarybypasssystems/manufacturer-limits.json b/Cardiopulmonarybypasssystems/manufacturer-limits.json
index 9ad6771..e8dfbe1 100644
--- a/Cardiopulmonarybypasssystems/manufacturer-limits.json
+++ b/Cardiopulmonarybypasssystems/manufacturer-limits.json
@@ -10,7 +10,7 @@
   "AntiCollapseAllowedIncreaseRate": 50,
   "RecirculationAllowedLimit": 8,
   "Rs485SerialSettings": {
-    "PortName": "COM3",
+    "PortName": "COM9",
     "BaudRate": 9600,
     "Parity": "Even",
     "DataBits": 8,