diff --git a/Subsystems/cmdGui/MiniCmdUtil.py b/Subsystems/cmdGui/MiniCmdUtil.py
index cc47bb8..ec32fe2 100644
--- a/Subsystems/cmdGui/MiniCmdUtil.py
+++ b/Subsystems/cmdGui/MiniCmdUtil.py
@@ -24,6 +24,7 @@
 import socket
 import sys
 from pathlib import Path
+from collections import namedtuple
 
 ROOTDIR = Path().resolve().parent
 sys.path.append(ROOTDIR.parent.parent)
@@ -35,6 +36,23 @@
 class MiniCmdUtil:
     ccsdsExt = bytearray(4)
     cfsCmdSecHdr = bytearray(2)
+    TypeSignature = namedtuple("TypeSignature", 'byteLen, signed, endian')
+    dataTypes = {
+        ("b", "int8", "byte"): TypeSignature(1, True, None),
+        ("m", "uint8"): TypeSignature(1, False, None),
+        ("h", "int16", "half"): TypeSignature(2, True, None),
+        ("n", "uint16"): TypeSignature(2, False, None),
+        ("l", "int32", "long", "word"): TypeSignature(4, True, None),
+        ("o", "uint32"): TypeSignature(4, False, None),
+        ("q", "int64"): TypeSignature(8, True, None),
+        ("p", "uint64"): TypeSignature(8, False, None),
+        ("i", "int16b"): TypeSignature(2, True, "big"),
+        ("j", "int32b"): TypeSignature(4, True, "big"),
+        ("k", "int64b"): TypeSignature(8, True, "big"),
+        ("w", "uint16b"): TypeSignature(2, False, "big"),
+        ("x", "uint32b"): TypeSignature(4, False, "big"),
+        ("y", "uint64b"): TypeSignature(8, False, "big")
+    }
 
     def __init__(self,
                  host="127.0.0.1",
@@ -44,12 +62,10 @@ def __init__(self,
                  pktID=None,
                  cmdCode=None,
                  payload=None):
-        endians = {"BE": ">", "LE": "<"}
-        self.dataTypes = {"byte": 8, "half": 16, "long": 32}
 
         self.host = host
         self.port = port
-        self.endian = ">" if endian == "BE" else "<"
+        self.endian = "big" if endian == "BE" else "little"
         self.pktID = pktID
         self.cmdCode = cmdCode
         self.hdrVer = hdrVer
@@ -68,4 +84,25 @@ def assemblePriHeader(self):
 
 
 def assemblePayload(self):
-    pass
\ No newline at end of file
+    completePayload = bytearray(0)
+    paramList = self.payload.split(" ")
+    for param in paramList:
+        if "--string" not in param:  ## non-string param
+            items = param.split("=")  ## e.g. ["--uint16", "2"]
+            dataType = items[0].strip("-")  ## Remove "--" prefix
+            dataVal = int(items[1])  ## "2" --> 2
+            for key in self.dataTypes:  ## Loop thru dictionary
+                if dataType in key:  ## Check if "uint16" in key tuple
+                    ## Get the TypeSignature tuple
+                    typeSig = self.dataTypes[key]
+                    break  ## Stop checking dictionary
+            ## If TypeSignature endian is None, get the user-provided endian
+            ## Otherwise get the TypeSignature endian
+            endian = typeSig.endian or self.endian
+            ## Convert to bytes of correct length, endianess, and sign
+            dataValb = dataVal.to_bytes(typeSig.byteLen,
+                                        byteorder=endian,
+                                        signed=typeSig.signed)
+            completePayload.extend(dataValb)    ## Add data to bytearray
+        else:
+            pass