diff --git a/pymodbus/client/sync.py b/pymodbus/client/sync.py
index 01ca0fcbe..04af8a25c 100644
--- a/pymodbus/client/sync.py
+++ b/pymodbus/client/sync.py
@@ -39,10 +39,7 @@ def __init__(self, framer, **kwargs):
         :param framer: The modbus framer implementation to use
         """
         self.framer = framer
-        if isinstance(self.framer, ModbusSocketFramer):
-            self.transaction = DictTransactionManager(self, **kwargs)
-        else:
-            self.transaction = FifoTransactionManager(self, **kwargs)
+        self.transaction = DictTransactionManager(self, **kwargs)
         self._debug = False
         self._debugfd = None
 
diff --git a/pymodbus/framer/rtu_framer.py b/pymodbus/framer/rtu_framer.py
index 4c343dbf9..fb808b125 100644
--- a/pymodbus/framer/rtu_framer.py
+++ b/pymodbus/framer/rtu_framer.py
@@ -186,6 +186,7 @@ def populateResult(self, result):
         :param result: The response packet
         """
         result.unit_id = self._header['uid']
+        result.transaction_id = self._header['uid']
 
     # ----------------------------------------------------------------------- #
     # Public Member Functions
@@ -221,6 +222,9 @@ def processIncomingPacket(self, data, callback, unit, **kwargs):
                     _logger.debug("Not a valid unit id - {}, "
                                   "ignoring!!".format(self._header['uid']))
                     self.resetFrame()
+            else:
+                _logger.debug("Frame check failed, ignoring!!")
+                self.resetFrame()
         else:
             _logger.debug("Frame - [{}] not ready".format(data))
 
@@ -235,6 +239,7 @@ def buildPacket(self, message):
                              message.unit_id,
                              message.function_code) + data
         packet += struct.pack(">H", computeCRC(packet))
+        message.transaction_id = message.unit_id  # Ensure that transaction is actually the unit id for serial comms
         return packet
 
     def sendPacket(self, message):