diff --git a/udsoncan/connections.py b/udsoncan/connections.py
index 2ed3a37..ee91e50 100755
--- a/udsoncan/connections.py
+++ b/udsoncan/connections.py
@@ -7,7 +7,6 @@
 from abc import ABC, abstractmethod
 import time
 from typing import Union, Dict
-import ctypes
 import selectors
 
 try:
@@ -696,7 +695,7 @@ def __init__(self,
                  txid: Optional[int] = None,
                  extid: Optional[int] = None,
                  name: Optional[str] = None,
-                 debug: bool = False,
+                 debug: Optional[bool] = None,
                  protocol = None,
                  baudrate = 500000,
                  ):
@@ -706,7 +705,6 @@ def __init__(self,
         self.result = Error_ID.ERR_SUCCESS
         self.protocol = protocol or Protocol_ID.ISO15765
         self.baudrate = baudrate
-        self.dll_debug = debug
 
         try:
             self.interface = J2534(windll)
@@ -720,6 +718,11 @@ def __init__(self,
             self.open()
             self.set_can_id(txid, rxid, extid)
 
+        if isinstance(debug, bool):
+            self.logger.critical("Argument debug deprecated in the constructor. Call conn.set_tatrix_debug() if need.")
+            if debug:
+                self.set_tatrix_debug()
+
     def __enter__(self) -> "J2534Connection":
         self.open()
         return self
@@ -749,13 +752,6 @@ def open(self) -> "J2534Connection":
 
         self.log_last_operation("PassThruOpen", with_raise=True)
 
-        if self.dll_debug:
-            self.result = self.interface.PassThruIoctl(0,
-                                                       Ioctl_Flags.TX_IOCTL_SET_DLL_DEBUG_FLAGS,
-                                                       SCONFIG_LIST([(0, Ioctl_Flags.TX_IOCTL_DLL_DEBUG_FLAG_J2534_CALLS.value)])
-                                                       )
-            self.log_last_operation("PassThruIoctl SET_DLL_DEBUG")
-
         # Get the firmeware and DLL version etc, mainly for debugging output
         self.result, self.firmwareVersion, self.dllVersion, self.apiVersion = self.interface.PassThruReadVersion(self.devID)
         self.log_last_operation("PassThruReadVersion")
@@ -860,15 +856,18 @@ def log_last_operation(self, exec_method: str, with_raise = False) -> None:
     def read_vbatt(self, digits=1) -> float:
         self.check_connection_opened()
 
-        vbatt = ctypes.POINTER(ctypes.c_int32)()
-
-        self.result = self.interface.PassThruIoctl(self.channelID, Ioctl_ID.READ_VBATT, None, vbatt)
+        self.result, value = self.interface.PassThruIoctl_READ_VBATT(self.devID)
         self.log_last_operation("PassThruIoctl READ_VBATT")
 
-        value = ctypes.cast(vbatt, ctypes.c_void_p).value
-
         return round(value / 1000, digits) if value else 0
 
+    def set_tatrix_debug(self, enable: bool = True):
+        from ctypes import c_ulong
+        flags = Ioctl_Flags.TX_IOCTL_DLL_DEBUG_FLAG_J2534_CALLS.value if enable else 0
+
+        self.result = self.interface.PassThruIoctl(0, Ioctl_ID.TX_IOCTL_SET_DLL_DEBUG_FLAGS, c_ulong(flags), None)
+        self.log_last_operation("PassThruIoctl SET_DLL_DEBUG_FLAGS")
+
 
 class FakeConnection(BaseConnection):
     """
diff --git a/udsoncan/j2534.py b/udsoncan/j2534.py
index 2678373..a196ba2 100755
--- a/udsoncan/j2534.py
+++ b/udsoncan/j2534.py
@@ -1,5 +1,5 @@
 from enum import Enum
-from ctypes import Structure, WINFUNCTYPE, POINTER, cast, cdll, c_char, c_long, c_void_p, c_ubyte, c_ulong, byref  # type: ignore
+from ctypes import Structure, WINFUNCTYPE, POINTER, cdll, c_char, c_long, c_void_p, c_ubyte, c_ulong, byref  # type: ignore
 
 
 class Error_ID(Enum):
@@ -218,6 +218,12 @@ class Ioctl_ID(Enum):
     T3_MAX = 0x24
     ISO15765_WFT_MAX = 0x25
 
+    # Tatrix specific
+    TX_IOCTL_APP_SERVICE             = 0x70000
+    TX_IOCTL_SET_DLL_DEBUG_FLAGS     = 0x70001
+    TX_IOCTL_SET_DEV_DEBUG_FLAGS     = 0x70002
+    TX_IOCTL_SET_DLL_STATUS_CALLBACK = 0x70003
+
     # J2534-2
     CAN_MIXED_FORMAT          = 0x8000
     J1962_PINS                = 0x8001
@@ -234,10 +240,11 @@ class Ioctl_ID(Enum):
     INPUT_RANGE_HIGH          = 0x8027 # Upper limit in millivolts of A/D input. Read Only.
 
 
+# Tatrix specific
 class Ioctl_Flags(Enum):
-    TX_IOCTL_BASE = 0x70000
-    TX_IOCTL_SET_DLL_DEBUG_FLAGS = 0x70001
-    TX_IOCTL_DLL_DEBUG_FLAG_J2534_CALLS = 0x00000001
+    TX_IOCTL_DLL_DEBUG_FLAG_J2534_CALLS   = 0x00000001
+    TX_IOCTL_DLL_DEBUG_FLAG_ALL_DEV_COMMS = 0x00000002
+    TX_IOCTL_DEV_DEBUG_FLAG_USB_COMMS     = 0x00000001
 
 
 class PASSTHRU_MSG(Structure):
@@ -384,7 +391,7 @@ def __init__(self, windll: str):
             c_void_p,
             c_void_p,
         )
-        dllPassThruIoctlParams = (1, "Handle", 0), (1, "IoctlID", 0), (1, "pInput", 0), (1, "pOutput", 0)
+        dllPassThruIoctlParams = (1, "HandleID", 0), (1, "IoctlID", 0), (1, "pInput", 0), (1, "pOutput", 0)
         self.dllPassThruIoctl = dllPassThruIoctlProto(("PassThruIoctl", self.hDLL), dllPassThruIoctlParams)
 
     def PassThruOpen(self):
@@ -465,13 +472,19 @@ def PassThruGetLastError(self):
         result = self.dllPassThruGetLastError(pErrorDescription)
         return Error_ID(result), pErrorDescription.value.decode()
 
-    def PassThruIoctl(self, Handle, IoctlID, ioctlInput=None, ioctlOutput=None):
+    def PassThruIoctl(self, HandleID, IoctlID: Ioctl_ID, ioctlInput=None, ioctlOutput=None):
         pInput = None if ioctlInput is None else byref(ioctlInput)
         pOutput = None if ioctlOutput is None else byref(ioctlOutput)
 
-        result = self.dllPassThruIoctl(Handle, c_ulong(IoctlID.value), pInput, pOutput)
+        result = self.dllPassThruIoctl(HandleID, c_ulong(IoctlID.value), pInput, pOutput)
         return Error_ID(result)
 
+    def PassThruIoctl_READ_VBATT(self, DeviceID):
+        vbatt = c_ulong()
+
+        result = self.PassThruIoctl(DeviceID, Ioctl_ID.READ_VBATT, None, vbatt)
+        return result, vbatt.value
+
     def PassThruStartMsgFilter(self, ChannelID, txid: int, rxid: int, extid = None):
         self.txid = txid.to_bytes(4, "big")
         self.rxid = rxid.to_bytes(4, "big")