diff --git a/ProductFunctionTester/Main_Form.vb b/ProductFunctionTester/Main_Form.vb
index e320854..7cf03ed 100644
--- a/ProductFunctionTester/Main_Form.vb
+++ b/ProductFunctionTester/Main_Form.vb
@@ -4123,6 +4123,16 @@ DataFail:
         retVal = PollingReceiveData(500)
         txbWindow.AppendText("TD READ DATA: " & retVal & "" & vbCrLf)
 
+        Dim c As Integer = Asc(retVal.Substring(0, 1))  ' 첫 글자 아스키값
+
+        If Not ((c >= 48 And c <= 57) Or (c >= 65 And c <= 90) Or (c >= 97 And c <= 122)) Then
+            Return "0"
+        End If
+
+        'If Not ((c >= 48 And c <= 57) And retVal.Length > td_name_size) Then
+        '    Return "0"
+        'End If
+
         If retVal.Length > td_name_size Then
             Return retVal
         Else