diff --git a/sim/counterbox_sim.py b/sim/counterbox_sim.py
index 6f6755a..d32800e 100644
--- a/sim/counterbox_sim.py
+++ b/sim/counterbox_sim.py
@@ -16,6 +16,7 @@ class CounterBox:
     def __init__(self, total_channels):
         self.total_channels = total_channels
         self.counts = [0] * self.total_channels
+        self.rates = [randrange(5) for i in range(self.total_channels)]
 
         self.status = 0
         self.countmode = 'time'
@@ -41,7 +42,8 @@ class CounterBox:
 
     def updateCounts(self):
         for i in range(self.total_channels):
-            self.counts[i] += randrange(5)        
+            self.rates[i] = randrange(5)
+            self.counts[i] += self.rates[i]
 
     def getRunTime(self):
         elapsed = round(time.time() - self.starttime, 3)
@@ -68,6 +70,10 @@ class CounterBox:
 
         return self.elapsed
 
+    def stop(self):
+        self.getRunTime()
+        self.status = 0
+
     def startTimePreset(self, presettime):
         self.countmode = 'time'
         self.status = 1
@@ -79,6 +85,15 @@ class CounterBox:
         self.status = 1
         self.presetcount = presetcount
         self.resetCounts()
+
+    def setMonitorChannel(self, channel):
+        self.monitor = channel - 1
+
+    def getMonitorChannel(self):
+        return self.monitor + 1
+
+    def getRate(self, channel):
+        return float(self.rates[channel - 1])
         
 with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
 
@@ -129,6 +144,9 @@ with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
                 elif data == 'RS':
                     send(str(counterbox.getStatus()))
 
+                elif data == 'S':
+                    counterbox.stop()
+
                 elif re.fullmatch(r'TP (\d+(\.\d+)?)', data):
                     presettime = float(re.fullmatch(r'TP (\d+(\.\d+)?)', data).group(1))
                     counterbox.startTimePreset(presettime)
@@ -139,6 +157,17 @@ with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
                     counterbox.startCountPreset(counts)
                     send('')
 
+                elif data == 'PC':
+                    send(str(counterbox.getMonitorChannel()))
+
+                elif re.fullmatch(r'PC (\d+)', data):
+                    channel = int(re.fullmatch(r'PC (\d+)', data).group(1))
+                    counterbox.setMonitorChannel(channel)
+
+                elif re.fullmatch(r'RR (\d+)', data):
+                    channel = int(re.fullmatch(r'RR (\d+)', data).group(1))
+                    send(counterbox.getRate(channel))
+
                 else:
                     send('?2') # Bad command