Issue 2675 correctly reverse fixed size datatypes

pymodbus/client/mixin.py

@@ -771,5 +771,20 @@ def convert_to_registers(
             for x in range(0, len(byte_list), 2)
         ]
         if word_order == "little":
-            regs.reverse()
+            return cls._get_reversed_registers(regs, data_type)
+
         return regs
+
+    @classmethod
+    def _get_reversed_registers(cls, regs: list[int], data_type: DATATYPE) -> list[int]:
+        data_type_len = data_type.value[1]
+        if not data_type_len:
+            regs.reverse()
+            return regs
+
+        reversed_regs = []
+        for x in range(0, len(regs), data_type_len):
+            single_value_regs = regs[x: x + data_type_len]
+            single_value_regs.reverse()
+            reversed_regs = reversed_regs + single_value_regs
+        return reversed_regs