Index: leahi_dialin/dd/modules/records.py
===================================================================
diff -u -r6d9a45c779b9ee3c362f85820db9f89d8dbb8b3c -ree914de19a46c34d2103b56072640895779728ec
--- leahi_dialin/dd/modules/records.py	(.../records.py)	(revision 6d9a45c779b9ee3c362f85820db9f89d8dbb8b3c)
+++ leahi_dialin/dd/modules/records.py	(.../records.py)	(revision ee914de19a46c34d2103b56072640895779728ec)
@@ -27,7 +27,7 @@
 from leahi_dialin.utils.abstract_classes import AbstractSubSystem
 from leahi_dialin.utils.base import publish
 from leahi_dialin.utils.enums import DialinEnum
-from leahi_dialin.utils.conversions import integer_to_bytearray, float_to_bytearray, byte_to_bytearray, unsigned_short_to_bytearray
+from leahi_dialin.utils.conversions import integer_to_bytearray, float_to_bytearray, byte_to_bytearray, unsigned_short_to_bytearray, string_to_bytearray
 
 
 class DDRecords(AbstractSubSystem):
@@ -576,11 +576,9 @@
             raise ValueError(f'serial must be 20 characters, provided is: {len(serial_number)}')
         
         payload = integer_to_bytearray(is_ro_featured)
-        payload = integer_to_bytearray(is_ro_featured_boost_pump)
-        for c in part_number:
-            payload += byte_to_bytearray(c)
-        for c in serial_number:
-            payload += byte_to_bytearray(c)
+        payload += integer_to_bytearray(is_ro_featured_boost_pump)
+        payload += string_to_bytearray(part_number)
+        payload += string_to_bytearray(serial_number)
         payload += integer_to_bytearray(manufacturing_location)
         payload += integer_to_bytearray(manufacturing_date)
         payload += unsigned_short_to_bytearray(self.crc16(payload))
Index: leahi_dialin/utils/conversions.py
===================================================================
diff -u -r6a318bab36cd1e28b42a0683abd5052b63ed5f20 -ree914de19a46c34d2103b56072640895779728ec
--- leahi_dialin/utils/conversions.py	(.../conversions.py)	(revision 6a318bab36cd1e28b42a0683abd5052b63ed5f20)
+++ leahi_dialin/utils/conversions.py	(.../conversions.py)	(revision ee914de19a46c34d2103b56072640895779728ec)
@@ -19,6 +19,16 @@
 # https://docs.python.org/3/library/struct.html#format-characters
 
 
+def string_to_bytearray(val: str) -> bytes:
+    """
+    Converts a string value into a byte array (little endian)
+
+    @param val: (str) string to convert to byte array
+    @return: byte array
+    """
+    return struct.pack(f"{len(val)}s", val.encode('ascii'))
+
+
 def byte_to_bytearray(val: int) -> bytes:
     """
     Converts a byte value into a byte array (little endian)