diff --git a/aprslib/packets/telemetry.py b/aprslib/packets/telemetry.py
index 65e5505..1461322 100644
--- a/aprslib/packets/telemetry.py
+++ b/aprslib/packets/telemetry.py
@@ -1,25 +1,101 @@
 from aprslib.packets.base import APRSPacket
 
-class TelemetryReport(APRSPacket):
-    format = 'raw'
-    telemetry = dict(seq=0,
-                     vals=['0']*6)
-    telemetry['vals'][5] = ['1']*8  # Replace io data with list of 8 values
-    comment = ''
+class TelemetryAddon(object):
+    analog_values = None
+    _sequence_number = 0
+    _digital_value = 0
+
+    def __init__(self, *args, **kwargs):
+        super(TelemetryAddon, self).__init__( *args, **kwargs)
+
+        self. analog_values = AnalogList()
+
+    @property
+    def sequence_number(self):
+        return self._sequence_number
+
+    @sequence_number.setter
+    def sequence_number(self, v):
+        if 0 <= v <= 999:
+            self._sequence_number = v
+        else:
+            raise ValueError("Value outside of range 0-999")
+
+    @property
+    def digital_value(self):
+        return self._digital_value
+
+    @digital_value.setter
+    def digital_value(self, v):
+        if 0 <= v <= 0xFF:
+            self._digital_value = v
+        else:
+            raise ValueError("Value outside of range 0-255")
+
+
+class AnalogList(list):
+    def __init__(self):
+        list.__init__(self, [0] * 5)
+
+    def __setitem__(self, i, v):
+        if not 0 <= i <= 4:
+            raise IndexError("Index outside of range 0-4, got %d" % i)
+        if not 0 <= v <= 999:
+            raise ValueError("Value outside of range 0-999, got %d" % v)
+        else:
+            list.__setitem__(self, i, v)
+
+    def __setslice__(self, i, j, v):
+        if i > j:
+            i, j = j, i
+        if (not 0 <= i <= 5) or (not 0 <= j <= 5):
+            raise IndexError("Slice outside of range [0:5], got %s" % [i, j])
+
+        for x in range(i, j):
+            list.__setitem__(self, x, v[x])
+
+    def append(self, other):
+        raise NotImplementedError("not supported")
+
+    def remove(self, other):
+        raise NotImplementedError("not supported")
+
+    def pop(self):
+        raise NotImplementedError("not supported")
+
+    def extend(self):
+        raise NotImplementedError("not supported")
+
+    def insert(self):
+        raise NotImplementedError("not supported")
+
+
+class TelemetryReport(TelemetryAddon, APRSPacket):
+    @property
+    def format(self):
+        return 'raw'
+
+    _comment = ''
+
+    @property
+    def comment(self):
+        return self._comment
+
+    @comment.setter
+    def comment(self, v):
+        if isinstance(v, str):
+            self._comment = v
+        else:
+            raise TypeError("Expected comment to be of type str, got %s" % type(v))
 
     def _serialize_body(self):
-        # What do we do when len(digitalvalue) != 8?
-        tempio = ''.join(self.telemetry['vals'][5])
-
-        body = [
-            str(self.telemetry['seq']).zfill(3),
-            str(self.telemetry['vals'][0]).zfill(3),
-            str(self.telemetry['vals'][1]).zfill(3),
-            str(self.telemetry['vals'][2]).zfill(3),
-            str(self.telemetry['vals'][3]).zfill(3),
-            str(self.telemetry['vals'][4]).zfill(3),
-            str(tempio),
+        return ("T#" + ("{:03d}," * 6) + "{:08b}{:s}").format(
+            self.sequence_number,
+            self.analog_values[0],
+            self.analog_values[1],
+            self.analog_values[2],
+            self.analog_values[3],
+            self.analog_values[4],
+            self.digital_value,
             self.comment,
-        ]
-        # Add packet type to body joined by commas
-        return 'T#' + ",".join(body)
+            )