diff --git a/api/icsneoc/icsneoc.cpp b/api/icsneoc/icsneoc.cpp
index 29eb4e6..3aebd46 100644
--- a/api/icsneoc/icsneoc.cpp
+++ b/api/icsneoc/icsneoc.cpp
@@ -143,6 +143,15 @@ bool icsneo_closeDevice(const neodevice_t* device) {
 	return true;
 }
 
+bool icsneo_isOpen(const neodevice_t* device) {
+	if(!icsneo_isValidNeoDevice(device)) {
+		ErrorManager::GetInstance().add(APIError::InvalidNeoDevice);
+		return false;
+	}
+
+	return device->device->isOpen();
+}
+
 bool icsneo_goOnline(const neodevice_t* device) {
 	if(!icsneo_isValidNeoDevice(device)) {
 		ErrorManager::GetInstance().add(APIError::InvalidNeoDevice);
diff --git a/device/device.cpp b/device/device.cpp
index 0d121a8..1459706 100644
--- a/device/device.cpp
+++ b/device/device.cpp
@@ -135,6 +135,10 @@ void Device::enforcePollingMessageLimit() {
 }
 
 bool Device::open() {
+	if(opened) {
+		return false;
+	}
+
 	if(!com) {
 		err(APIError::Unknown);
 		return false;
@@ -170,10 +174,15 @@ bool Device::open() {
 		handleInternalMessage(message);
 	}));
 
+	opened = true;
 	return true;
 }
 
 bool Device::close() {
+	if(!opened) {
+		return false;
+	}
+
 	if(!com) {
 		err(APIError::Unknown);
 		return false;
@@ -183,7 +192,8 @@ bool Device::close() {
 		com->removeMessageCallback(internalHandlerCallbackID);
 
 	goOffline();
-	return com->close();
+	opened = !com->close();
+	return !opened;
 }
 
 bool Device::goOnline() {
diff --git a/include/icsneo/device/device.h b/include/icsneo/device/device.h
index 410d391..2871968 100644
--- a/include/icsneo/device/device.h
+++ b/include/icsneo/device/device.h
@@ -44,6 +44,7 @@ public:
 	virtual bool open();
 	virtual bool close();
 	virtual bool isOnline() const { return online; }
+	virtual bool isOpen() const { return opened; }
 	virtual bool goOnline();
 	virtual bool goOffline();
 
@@ -83,6 +84,7 @@ public:
 protected:
 	uint16_t productId = 0;
 	bool online = false;
+	bool opened = false;
 	int messagePollingCallbackID = 0;
 	int internalHandlerCallbackID = 0;
 	device_errorhandler_t err;
diff --git a/include/icsneo/icsneoc.h b/include/icsneo/icsneoc.h
index e27d0aa..362c515 100644
--- a/include/icsneo/icsneoc.h
+++ b/include/icsneo/icsneoc.h
@@ -115,6 +115,17 @@ extern bool DLLExport icsneo_openDevice(const neodevice_t* device);
  */
 extern bool DLLExport icsneo_closeDevice(const neodevice_t* device);
 
+/**
+ * \brief Verify network connection for the specified hardware
+ * \param[in] device A pointer to the neodevice_t structure specifying the device to operate on.
+ * \returns True if the device is connected.
+ * 
+ * This function does not modify the working state of the device at all.
+ * 
+ * See icsneo_openDevice() for an explanation about the concept of being "open".
+ */
+extern bool DLLExport icsneo_isOpen(const neodevice_t* device);
+
 /**
  * \brief Enable network communication for the specified hardware
  * \param[in] device A pointer to the neodevice_t structure specifying the device to operate on.
@@ -135,7 +146,7 @@ extern bool DLLExport icsneo_goOnline(const neodevice_t* device);
  * \param[in] device A pointer to the neodevice_t structure specifying the device to operate on.
  * \returns True if communication could be disabled.
  * 
- * See icsneo_goOnline() for an explaination about the concept of being "online".
+ * See icsneo_goOnline() for an explanation about the concept of being "online".
  */
 extern bool DLLExport icsneo_goOffline(const neodevice_t* device);
 
@@ -146,7 +157,7 @@ extern bool DLLExport icsneo_goOffline(const neodevice_t* device);
  * 
  * This function does not modify the working state of the device at all.
  * 
- * See icsneo_goOnline() for an explaination about the concept of being "online".
+ * See icsneo_goOnline() for an explanation about the concept of being "online".
  */
 extern bool DLLExport icsneo_isOnline(const neodevice_t* device);
 
@@ -667,6 +678,9 @@ fn_icsneo_openDevice icsneo_openDevice;
 typedef bool(*fn_icsneo_closeDevice)(const neodevice_t* device);
 fn_icsneo_closeDevice icsneo_closeDevice;
 
+typedef bool(*fn_icsneo_isOpen)(const neodevice_t* device);
+fn_icsneo_isOpen icsneo_isOpen;
+
 typedef bool(*fn_icsneo_goOnline)(const neodevice_t* device);
 fn_icsneo_goOnline icsneo_goOnline;
 
@@ -784,6 +798,7 @@ int icsneo_init() {
 	ICSNEO_IMPORTASSERT(icsneo_isValidNeoDevice);
 	ICSNEO_IMPORTASSERT(icsneo_openDevice);
 	ICSNEO_IMPORTASSERT(icsneo_closeDevice);
+	ICSNEO_IMPORTASSERT(icsneo_isOpen);
 	ICSNEO_IMPORTASSERT(icsneo_goOnline);
 	ICSNEO_IMPORTASSERT(icsneo_goOffline);
 	ICSNEO_IMPORTASSERT(icsneo_isOnline);