From 7248a780535b286f873fdc48a9bb432ca77ac540 Mon Sep 17 00:00:00 2001
From: Teja <mail@tejaphilipp.de>
Date: Sat, 28 Mar 2015 19:20:15 +0100
Subject: [PATCH] set DTR to false after connecting. workaround for wrong
 connection detection.

---
 src/octoprint/util/comm.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/octoprint/util/comm.py b/src/octoprint/util/comm.py
index d0e1cd89..6dca6f01 100644
--- a/src/octoprint/util/comm.py
+++ b/src/octoprint/util/comm.py
@@ -1104,6 +1104,8 @@ class MachineCom(object):
 				self._serial.close()
 				self._serial.parity = serial.PARITY_NONE
 				self._serial.open()
+				if self._grbl :
+					self._serial.setDTR(False) # Drop DTR
 			except:
 				self._log("Unexpected error while connecting to serial port: %s %s" % (self._port, getExceptionString()))
 				self._errorValue = "Failed to open serial port, permissions correct?"