revert "fixes for RTS/DTR handling on open", bad solution

- with the patch, control lines have wrong initial state on posix
- makes no difference on win32, execpt add code

3 files changed, 10 insertions, 17 deletions

diff --git a/serial/serialposix.py b/serial/serialposix.py
index f5fc43a..67a3fd4 100644
--- a/serial/serialposix.py
+++ b/serial/serialposix.py
@@ -551,19 +551,17 @@ class Serial(SerialBase, PlatformSpecific):
 
     def _update_rts_state(self):
         """Set terminal status line: Request To Send"""
-        if self._rts_state is not None:
-            if self._rts_state:
-                fcntl.ioctl(self.fd, TIOCMBIS, TIOCM_RTS_str)
-            else:
-                fcntl.ioctl(self.fd, TIOCMBIC, TIOCM_RTS_str)
+        if self._rts_state:
+            fcntl.ioctl(self.fd, TIOCMBIS, TIOCM_RTS_str)
+        else:
+            fcntl.ioctl(self.fd, TIOCMBIC, TIOCM_RTS_str)
 
     def _update_dtr_state(self):
         """Set terminal status line: Data Terminal Ready"""
-        if self._dtr_state is not None:
-            if self._dtr_state:
-                fcntl.ioctl(self.fd, TIOCMBIS, TIOCM_DTR_str)
-            else:
-                fcntl.ioctl(self.fd, TIOCMBIC, TIOCM_DTR_str)
+        if self._dtr_state:
+            fcntl.ioctl(self.fd, TIOCMBIS, TIOCM_DTR_str)
+        else:
+            fcntl.ioctl(self.fd, TIOCMBIC, TIOCM_DTR_str)
 
     @property
     def cts(self):
diff --git a/serial/serialutil.py b/serial/serialutil.py
index 80416ea..05ebd87 100644
--- a/serial/serialutil.py
+++ b/serial/serialutil.py
@@ -154,8 +154,8 @@ class SerialBase(io.RawIOBase):
         self._dsrdtr = None
         self._inter_byte_timeout = None
         self._rs485_mode = None  # disabled by default
-        self._rts_state = None
-        self._dtr_state = None
+        self._rts_state = True
+        self._dtr_state = True
         self._break_state = False
 
         # assign values using get/set methods using the properties feature
diff --git a/serial/serialwin32.py b/serial/serialwin32.py
index 1611e21..b843ac7 100644
--- a/serial/serialwin32.py
+++ b/serial/serialwin32.py
@@ -39,11 +39,6 @@ class Serial(SerialBase):
             raise SerialException("Port must be configured before it can be used.")
         if self.is_open:
             raise SerialException("Port is already open.")
-        # if RTS and/or DTR are not set before open, they default to True
-        if self._rts_state is None:
-            self._rts_state = True
-        if self._dtr_state is None:
-            self._dtr_state = True
         # the "\\.\COMx" format is required for devices other than COM1-COM8
         # not all versions of windows seem to support this properly
         # so that the first few ports are used with the DOS device name