diff --git a/app/src/main/java/com/example/hpostesting/data/constant/HemoCubeCommands.kt b/app/src/main/java/com/example/hpostesting/data/constant/HemoCubeCommands.kt
index 5eee6f7..aa47f52 100644
--- a/app/src/main/java/com/example/hpostesting/data/constant/HemoCubeCommands.kt
+++ b/app/src/main/java/com/example/hpostesting/data/constant/HemoCubeCommands.kt
@@ -2,7 +2,7 @@ package com.example.hpostesting.data.constant
 
 enum class HemoCubeCommands(val command: String) {
     startBuffer("B\r"),
-    getBuffer("B\r"),
+    getBuffer("Q\r"),
     startSample("S\r"),
-    getSample("P\r"),
+    getSample("R\r"),
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/example/hpostesting/presentation/hemocube/HemoCubeFragment.kt b/app/src/main/java/com/example/hpostesting/presentation/hemocube/HemoCubeFragment.kt
index 19b5360..6c23fe0 100644
--- a/app/src/main/java/com/example/hpostesting/presentation/hemocube/HemoCubeFragment.kt
+++ b/app/src/main/java/com/example/hpostesting/presentation/hemocube/HemoCubeFragment.kt
@@ -94,16 +94,42 @@ class HemoCubeFragment : Fragment() {
             }
         }
 
-//        if (checkBufferValue()) {
+        if (checkBufferValue()) {
 //            TODO("Call S command")
-//            //We have to store the buffer value like this
-//            with(sharedPreference.edit()) {
-//                putInt(Constants.BUFFER_VALUE, 2000)
-//                apply()
-//            }
-//        } else {
+            //We have to store the buffer value like this
+            with(sharedPreference.edit()) {
+                putInt(Constants.BUFFER_VALUE, 2000)
+                apply()
+            }
+
+            UIUtils.createAlertDialog(
+                requireContext(),
+                "WARNING",
+                "Please check if you have placed the sample of this person",
+                getString(R.string.no),
+                "Yes",
+                object : MyDialogListener {
+                    override fun onClickNegativeButton() {}
+                    override fun onClickPositiveButton() {
+                        UIUtils.createAlertDialog(
+                            requireContext(),
+                            getString(R.string.have_you_placed_sample),
+                            getString(R.string.please_place_sample),
+                            getString(R.string.no),
+                            getString(R.string.yes_and_run),
+                            object : MyDialogListener {
+                                override fun onClickNegativeButton() {}
+                                override fun onClickPositiveButton() {
+//                                    fetchHemoCubeResult()
+                                    getSampleResult()
+                                }
+                            })
+                    }
+                }
+            )
+        } else {
 //            TODO("Call B command")
-//        }
+        }
     }
 
     private fun checkBufferValue(): Boolean {
@@ -240,7 +266,7 @@ class HemoCubeFragment : Fragment() {
                     binding.tvSubtitle4.text = fullReadOutput
                     resultData = fullReadOutput.toString()
                     DataHolder.hemoCubeTestData?.resultData
-                    resultRatio = "" //TODO
+                    resultRatio = "" // TODO
                     val pareseddata = parseUsbData(fullReadOutput.toString())
                     Log.d("Result", data.toString())
                     hemoCubeViewModel.progressBar.postValue(false)
@@ -340,17 +366,17 @@ class HemoCubeFragment : Fragment() {
                         if (stringData.contains("RESULT", true)) {
 //                            hemoCubeViewModel.mapDeviceConstants(fullReadOutput.toString())
 
-                            val response: String = "RESULT SN18291 1937.23 2828.11 28211.20 121829.12"
+//                            val response: String = "RESULT SN18291 1937.23 2828.11 28211.20 121829.12"
 
-//                            val response = stringData
+                            val response = stringData
                             val result = response.split(" ")
                             val deviceSerialNo = result[1]
-                            val led1Buffer = result[2].toDouble()
-                            val led2Buffer = result[3].toDouble()
-                            val led1Sample = result[4].toDouble()
-                            val led2Sample = result[5].toDouble()
-                            val led1Average = log10(led1Buffer / led1Sample)
-                            val led2Average = log10(led1Buffer / led1Sample)
+                            val led1Buffer = result[2].toDoubleOrNull()
+                            val led2Buffer = result[3].toDoubleOrNull()
+                            val led1Sample = result[4].toDoubleOrNull()
+                            val led2Sample = result[5].toDoubleOrNull()
+                            val led1Average = log10(led1Buffer?.div(led1Sample!!) ?: 0.0)
+                            val led2Average = log10(led2Buffer?.div(led2Sample!!) ?: 0.0)
                             val deviceRatio = led1Average / led2Average
                             DataHolder.hemoCubeTestData?.deviceSerialNumber = deviceSerialNo
                             DataHolder.hemoCubeTestData?.led1Buffer = led1Buffer