diff --git a/INT99DC_7C/Forms/FormCommunication.cs b/INT99DC_7C/Forms/FormCommunication.cs
index 955f859..74b8276 100644
--- a/INT99DC_7C/Forms/FormCommunication.cs
+++ b/INT99DC_7C/Forms/FormCommunication.cs
@@ -482,9 +482,12 @@ namespace INT99DC_7C.Forms
                     this.button1LaneSend.Visible = true;
                     this.button10LaneSend.Visible = true;
 
-                    this.labelTitleStartAddress.Visible = true;
-                    this.labelStartAddress.Visible = true;
-                    this.labelStartAddress.Text = this.ParentForm.SystemConfig.ModbusTcpStartAddress.ToString();
+                    if (this.ParentForm.SystemConfig.EthernetOperationMode == 2) // Client일 때만 Start Address 사용
+                    {
+                        this.labelTitleStartAddress.Visible = true;
+                        this.labelStartAddress.Visible = true;
+                        this.labelStartAddress.Text = this.ParentForm.SystemConfig.ModbusTcpStartAddress.ToString();
+                    }
                     break;
                 default:
                     this.buttonDataSend.Visible = false;