diff --git a/pymodbus/transport/serialtransport.py b/pymodbus/transport/serialtransport.py
index c014b696a6..1c8634c2ee 100644
--- a/pymodbus/transport/serialtransport.py
+++ b/pymodbus/transport/serialtransport.py
@@ -12,7 +12,7 @@
 class SerialTransport(asyncio.Transport):
     """An asyncio serial transport."""
 
-    force_poll: bool = False
+    force_poll: bool
 
     def __init__(self, loop, protocol, url, baudrate, bytesize, parity, stopbits, timeout) -> None:
         """Initialize."""
@@ -36,9 +36,9 @@ def setup(self) -> None:
         else:
             try:
                 self.async_loop.add_reader(self.sync_serial.fileno(), self.intern_read_ready)
-            except Exception as exc:  # pylint: disable=broad-exception-caught
+            except Exception as exc:
                 text = f"JAN setup --> os.name({os.name}) and {exc} force({self.force_poll})"
-                raise Exception(text)
+                raise Exception(text)  # pylint: disable=raise-missing-from,broad-exception-raised
 
 
         self.async_loop.call_soon(self.intern_protocol.connection_made, self)
@@ -66,9 +66,9 @@ def write(self, data) -> None:
         if not self.force_poll:
             try:
                 self.async_loop.add_writer(self.sync_serial.fileno(), self.intern_write_ready)
-            except Exception as exc:  # pylint: disable=broad-exception-caught
+            except Exception as exc:
                 text = f"JAN write --> os.name({os.name}) and {exc} force({self.force_poll})"
-                raise Exception(text)
+                raise Exception(text)  # pylint: disable=raise-missing-from,broad-exception-raised
 
     def flush(self) -> None:
         """Clear output buffer and stops any more data being written."""