small fixes
diff --git a/serial/serialposix.py b/serial/serialposix.py
index 9064c6a..f8b14d1 100644
--- a/serial/serialposix.py
+++ b/serial/serialposix.py
@@ -310,7 +310,7 @@
             self.is_open = True
         if not self._dsrdtr:
             self._update_dtr_state()
-        if not self.rtscts:
+        if not self._rtscts:
             self._update_rts_state()
         self.reset_input_buffer()