diff --git a/n5coredll/N5Core.cs b/n5coredll/N5Core.cs
index 8c283fa..3c6c8c5 100644
--- a/n5coredll/N5Core.cs
+++ b/n5coredll/N5Core.cs
@@ -1085,16 +1085,13 @@ namespace n5coredll
            
             if (openSerialPort())
             {
-                if (!isProcessingSale)
+                String echoResult = sendInnerLinkTestRequest();
+                currResultJsonStr = null;
+                if (RequestResult.toReqResultFromJsonMsg(echoResult).Status != STATUS_SUCC)
                 {
-                    String echoResult = sendInnerLinkTestRequest();
-                    currResultJsonStr = null;
-                    if (RequestResult.toReqResultFromJsonMsg(echoResult).Status != STATUS_SUCC)
-                    {
-                        Console.WriteLine("LinkTest failed!");
-                        ifProcessingAbort = false;
-                        return RequestResult.createRespErrJson("requestAbort", "ABORT_RESP", ERR_STATUS_FAIL, ERR_CODE_ECHO, ERR_MSG_ECHO);
-                    }
+                    Console.WriteLine("LinkTest failed!");
+                    ifProcessingAbort = false;
+                    return RequestResult.createRespErrJson("requestAbort", "ABORT_RESP", ERR_STATUS_FAIL, ERR_CODE_ECHO, ERR_MSG_ECHO);
                 }
                 Thread.Sleep(500);
                 sendTime = 0;