diff --git a/opendis/dis7.py b/opendis/dis7.py
index db44079..ea53ea8 100644
--- a/opendis/dis7.py
+++ b/opendis/dis7.py
@@ -3787,23 +3787,23 @@ def serialize(self, outputStream):
         outputStream.write_unsigned_int(self.variableDatumID)
         outputStream.write_unsigned_int(self.variableDatumLength)
         for x in range(self.variableDatumLength // 8):  # length is in bits
-            outputStream.write_byte(self.variableData[x])
+            outputStream.write_unsigned_byte(self.variableData[x])
 
         #send padding
         for x in range(self.datumPaddingSizeInBits() // 8):
-            outputStream.write_byte(0)
+            outputStream.write_unsigned_byte(0)
 
     def parse(self, inputStream):
         """Parse a message. This may recursively call embedded objects."""
         self.variableDatumID = inputStream.read_unsigned_int()
         self.variableDatumLength = inputStream.read_unsigned_int()
         for x in range(self.variableDatumLength // 8):  # length is in bits
-            self.variableData.append(inputStream.read_byte())
+            self.variableData.append(inputStream.read_unsigned_byte())
 
         # Skip over padding
         # "This field shall be padded at the end to make the length a multiple of 64-bits."
         for x in range(self.datumPaddingSizeInBits() // 8):
-            inputStream.read_byte()
+            inputStream.read_unsigned_byte()
 
 
 class EventIdentifierLiveEntity:
@@ -7447,10 +7447,10 @@ def serialize(self, outputStream):
         outputStream.write_unsigned_short(self.encodingScheme)
         outputStream.write_unsigned_short(self.tdlType)
         outputStream.write_unsigned_int(self.sampleRate)
-        outputStream.write_short(len(self.data) * 8)
-        outputStream.write_short(self.samples)
+        outputStream.write_unsigned_short(len(self.data) * 8)
+        outputStream.write_unsigned_short(self.samples)
         for b in self.data:
-            outputStream.write_byte(b)
+            outputStream.write_unsigned_byte(b)
 
     def parse(self, inputStream):
         """Parse a message. This may recursively call embedded objects."""
@@ -7460,10 +7460,10 @@ def parse(self, inputStream):
         self.encodingScheme = inputStream.read_unsigned_short()
         self.tdlType = inputStream.read_unsigned_short()
         self.sampleRate = inputStream.read_unsigned_int()
-        self.dataLength = inputStream.read_short()
-        self.samples = inputStream.read_short()
+        self.dataLength = inputStream.read_unsigned_short()
+        self.samples = inputStream.read_unsigned_short()
         for idx in range(0, self.dataLength // 8):
-            element = inputStream.read_byte()
+            element = inputStream.read_unsigned_byte()
             self.data.append(element)