diff --git a/app/src/main/java/com/example/medilightv2android/ble/BleManager.kt b/app/src/main/java/com/example/medilightv2android/ble/BleManager.kt
index 20cab69..8bbd079 100644
--- a/app/src/main/java/com/example/medilightv2android/ble/BleManager.kt
+++ b/app/src/main/java/com/example/medilightv2android/ble/BleManager.kt
@@ -306,47 +306,51 @@ class BleManager private constructor(private val context: Context) {
     // Piezo Commands
     val piezoCollector = PiezoPacketCollector()
 
+    // ── Piezo Commands (테스터 exe와 동일 포맷: 파라미터=BE, 빈 파라미터=공백) ──
+
     fun sendPiezoPowerOn(freqOption: Int = 2, cycles: Int = 5) {
-        sendRaw(CRC16.buildCommand("mpa", intArrayOf(freqOption, cycles)))
+        sendRaw(CRC16.buildCommandBE("mpa", intArrayOf(freqOption, cycles)))
     }
 
     fun sendPiezoStop() {
-        sendRaw(CRC16.buildCommand("mps"))
+        sendRaw(CRC16.buildCommandASCII("mps", " "))
     }
 
     fun sendBurst(freqOption: Int, cycles: Int, delayUs: Int, piezoCh: Int = 0) {
-        sendRaw(CRC16.buildCommand("mec", intArrayOf(freqOption, delayUs, 140, cycles, 1, piezoCh)))
+        sendRaw(CRC16.buildCommandBE("mec", intArrayOf(freqOption, delayUs, 140, cycles, 1, piezoCh)))
     }
 
-    /** 6-channel measurement (maa) */
     fun sendAllChannels(mode: Int = 0) {
         piezoCollector.startMultiChannel(6)
-        sendRaw(CRC16.buildCommand("maa", intArrayOf(mode)))
+        sendRaw(CRC16.buildCommandASCII("maa", " "))
     }
 
-    // NIRS Commands
+    // ── NIRS Commands ──
+
     fun sendNirsPowerOn() {
-        sendRaw(CRC16.buildCommand("mta", intArrayOf(1)))
+        sendRaw(CRC16.buildCommandBE("mta", intArrayOf(1)))
     }
 
     fun sendNirsPowerOff() {
-        sendRaw(CRC16.buildCommand("mta", intArrayOf(0)))
+        sendRaw(CRC16.buildCommandBE("mta", intArrayOf(0)))
     }
 
     fun sendMqqQuery() {
-        sendRaw(CRC16.buildCommand("mqq"))
+        sendRaw(CRC16.buildCommandASCII("mqq", " "))
     }
 
     fun sendMagQuery() {
-        sendRaw(CRC16.buildCommand("mag"))
+        sendRaw(CRC16.buildCommandASCII("mag", " "))
     }
 
     fun sendMcjQuery() {
-        sendRaw(CRC16.buildCommand("mcj"))
+        sendRaw(CRC16.buildCommandASCII("mcj", " "))
     }
 
+    // ── Common Commands ──
+
     fun sendBatteryQuery() {
-        sendRaw(CRC16.buildCommand("msn", intArrayOf(0)))
+        sendRaw(CRC16.buildCommandBE("msn", intArrayOf(0)))
     }
 
     fun sendDeviceInfoQuery() {
@@ -367,10 +371,10 @@ class BleManager private constructor(private val context: Context) {
         sendRaw(CRC16.buildCommandASCII("mbb", " "))
     }
 
-    /** 6채널 측정만 (maa, rbb 헤더 없이 바로 reb×6→raa) */
+    /** 6채널 측정만 (maa) */
     fun sendChannelsOnly() {
         piezoCollector.startMultiChannel(6)
-        sendRaw(CRC16.buildCommand("maa", intArrayOf(0)))
+        sendRaw(CRC16.buildCommandASCII("maa", " "))
     }
 
     fun startBatteryPolling() {