diff --git a/zipline/monitor.py b/zipline/monitor.py
index f6b55037..e901b3ab 100644
--- a/zipline/monitor.py
+++ b/zipline/monitor.py
@@ -163,6 +163,7 @@ class Controller(object):
         self.ctime = 0
         self.tic = time.time()
         self.freeform = False
+        self._state = -1
 
         self.associated = []
 
@@ -218,17 +219,25 @@ class Controller(object):
             self.topology = frozenset(topology)
 
         default_states = [
+            CONTROL_STATES.INIT,
+            CONTROL_STATES.SOURCES_READY,
             CONTROL_STATES.RUNNING,
-            CONTROL_STATES.SHUTDOWN,
             CONTROL_STATES.TERMINATE,
         ]
 
         self.states = states or default_states
         self.polling = True
-
-        # Start off in RUNNING, state
         self.state = self.states[0]
 
+    @property
+    def state(self):
+        return self._state
+
+    @state.setter
+    def state(self, new):
+        old, self._state = self._state, new
+        self.logging.info("[Controller] State Transition : %s -> %s" %(old, new))
+
     def run(self):
         self.init_zmq(self.zmq_flavor)
 
@@ -472,7 +481,7 @@ class Controller(object):
         assert hard or soft, """ Must specify kill hard or soft """
 
         if hard:
-            self.state = CONTROL_STATES.SHUTDOWN
+            self.state = CONTROL_STATES.TERMINATE
 
             self.logging.info('[Controller] Hard Shutdown')
 
diff --git a/zipline/protocol.py b/zipline/protocol.py
index c3291556..90a3184a 100644
--- a/zipline/protocol.py
+++ b/zipline/protocol.py
@@ -126,9 +126,6 @@ from collections import namedtuple
 from protocol_utils import Enum, FrameExceptionFactory, namedict
 from date_utils import EPOCH, UN_EPOCH
 
-#import ujson
-#import ultrajson_numpy
-
 # -----------------------
 # Control Protocol
 # -----------------------
@@ -136,9 +133,10 @@ from date_utils import EPOCH, UN_EPOCH
 INVALID_CONTROL_FRAME = FrameExceptionFactory('CONTROL')
 
 CONTROL_STATES = Enum(
+    'INIT',
+    'SOURCES_READY',
     'RUNNING',
-    'SHUTDOWN',  # a soft kill
-    'TERMINATE', # a hard kill
+    'TERMINATE',
 )
 
 CONTROL_PROTOCOL = Enum(
@@ -149,6 +147,7 @@ CONTROL_PROTOCOL = Enum(
     'OK'        , # 3 - rep
     'DONE'      , # 4 - rep
     'EXCEPTION' , # 5 - rep
+    'SIGNAL'    , # 6 - rep
 )
 
 def CONTROL_FRAME(event, payload):
@@ -174,18 +173,6 @@ def CONTROL_UNFRAME(msg):
     except ValueError:
         raise INVALID_CONTROL_FRAME(msg)
 
-# -----------------------
-# Heartbeat Protocol
-# -----------------------
-
-# These encode the msgpack equivelant of 1 and 2. The heartbeat
-# frame should only be 1 byte on the wire.
-
-HEARTBEAT_PROTOCOL = namedict({
-    'REQ' : b'\x01',
-    'REP' : b'\x02',
-})
-
 # -----------------------
 # Component State
 # -----------------------