diff --git a/pyad2usb/ad2usb.py b/pyad2usb/ad2usb.py
index 36c0d4b..3c6fb7d 100644
--- a/pyad2usb/ad2usb.py
+++ b/pyad2usb/ad2usb.py
@@ -421,12 +421,12 @@ class AD2USB(object):
         args = (msg.partition, msg.event_type, msg.event_data)
         if msg._event_type == 'ALARM_PANIC':
             self._panic_status = True
-            self.on_panic(args + (True,))
+            self.on_panic(True)
 
         elif msg._event_type == 'CANCEL':
             if self._panic_status == True:
                 self._panic_status = False
-                self.on_panic(args + (False,))
+                self.on_panic(False)
 
         self.on_lrr_message(args)
 
diff --git a/pyad2usb/devices.py b/pyad2usb/devices.py
index f232ab5..1fecb33 100644
--- a/pyad2usb/devices.py
+++ b/pyad2usb/devices.py
@@ -271,7 +271,7 @@ class USBDevice(Device):
             if not no_reader_thread:
                 self._read_thread.start()
 
-            self.on_open((self._serial_number, self._description))
+            self.on_open()
 
     def close(self):
         """
@@ -489,7 +489,7 @@ class SerialDevice(Device):
 
         else:
             self._running = True
-            self.on_open(('N/A', "AD2SERIAL"))
+            self.on_open()
 
             if not no_reader_thread:
                 self._read_thread.start()
@@ -751,7 +751,7 @@ class SocketDevice(Device):
         else:
             self._running = True
 
-            self.on_open(('N/A', "AD2SOCKET"))
+            self.on_open()
 
             if not no_reader_thread:
                 self._read_thread.start()