diff --git a/ECTrainer2/BitalMonitor.cpp b/ECTrainer2/BitalMonitor.cpp
index cd16194..03a4b51 100644
--- a/ECTrainer2/BitalMonitor.cpp
+++ b/ECTrainer2/BitalMonitor.cpp
@@ -7,6 +7,7 @@
 BitalMonitor::BitalMonitor(ECTrainer* pEct)
 	:BaseProcess(pEct)
 	, _rrInterval(ECTrainer::RINGBUFSIZE, 0)
+	, _useDevice(false)
 {
 }
 
@@ -15,16 +16,27 @@
 
 	bool rv = _Com.Open(COM_PORT, _T("baud=19200 parity=N data=8 stop=1"));
 
-	return rv;
+	// �|�[�g�`�F�b�N
+	char comBuf[256] = { '\0' };
+	DWORD readBytes = _Com.Receive((BYTE*)comBuf, 256);
+	if (readBytes < 1) return true;
+	comBuf[readBytes] = '\0';
+	char* pt = strchr(comBuf, LF);
+	if (!pt) return true;
+	if (atoi(pt + 1) < 1) return true;
+
+	_useDevice = true;
+	return true;
 }
 
 // ���[�v
 bool BitalMonitor::MainLoop() {
 
+	if (!_useDevice) return true;
+
 	char lastBuf[256] = { '\0' };
 	char comBuf[256] = { '\0' };
 	char valueStr[10] = { '\0' };
-	const char LF = 10;
 
 	int count = 0;
 	while (_pEct->IsAppRun()) {
diff --git a/ECTrainer2/BitalMonitor.h b/ECTrainer2/BitalMonitor.h
index 2fe5620..c9507d4 100644
--- a/ECTrainer2/BitalMonitor.h
+++ b/ECTrainer2/BitalMonitor.h
@@ -8,13 +8,17 @@
 class BitalMonitor : public BaseProcess
 {
 	const int COM_PORT = 4;
+	const char LF = 10;
+
 	GComPort _Com;
 	RingBuffer<int> _rrInterval;
+	bool _useDevice;
 
 public:
 	BitalMonitor(ECTrainer* pEct);
 	bool Init();
 	bool MainLoop();
+	bool IsUseDevice() { return _useDevice; }
 	int GetRR() { return _rrInterval.Get(); }
 	int GetHB() { return _rrInterval.Get() < 1 ? 0 : 60000 / _rrInterval.Get(); }
 };