diff --git a/pymodbus/datastore/simulator.py b/pymodbus/datastore/simulator.py
index 5275fa5a7..8d8560586 100644
--- a/pymodbus/datastore/simulator.py
+++ b/pymodbus/datastore/simulator.py
@@ -767,7 +767,7 @@ def build_registers_from_value(cls, value, is_int):
         if is_int:
             value_bytes = int.to_bytes(value, 4, "big")
         else:
-            value_bytes = struct.pack("f", value)
+            value_bytes = struct.pack(">f", value)
         regs[0] = int.from_bytes(value_bytes[:2], "big")
         regs[1] = int.from_bytes(value_bytes[-2:], "big")
         return regs
@@ -781,5 +781,5 @@ def build_value_from_registers(cls, registers, is_int):
         if is_int:
             value = int.from_bytes(value_bytes, "big")
         else:
-            value = struct.unpack("f", value_bytes)[0]
+            value = struct.unpack(">f", value_bytes)[0]
         return value
diff --git a/test/test_simulator.py b/test/test_simulator.py
index 5366a5605..89f86cdca 100644
--- a/test/test_simulator.py
+++ b/test/test_simulator.py
@@ -130,16 +130,16 @@ class TestSimulator:
             type=CellType.UINT32, action=2, action_kwargs={"minval": 10, "maxval": 80}
         ),
         Cell(type=CellType.NEXT, value=50),
-        Cell(type=CellType.FLOAT32, access=True, value=72),
-        Cell(type=CellType.NEXT, access=True, value=17221),
-        Cell(type=CellType.FLOAT32, access=True, value=34161),
-        Cell(type=CellType.NEXT, access=True, value=45381),
-        Cell(type=CellType.FLOAT32, access=True, value=34161),
-        Cell(type=CellType.NEXT, access=True, value=45381),
-        Cell(type=CellType.FLOAT32, value=1653, action=1),
-        Cell(type=CellType.NEXT, value=43080),  # 40
-        Cell(type=CellType.FLOAT32, value=1653, action=1),
-        Cell(type=CellType.NEXT, value=43080),
+        Cell(type=CellType.FLOAT32, access=True, value=17731),
+        Cell(type=CellType.NEXT, access=True, value=18432),
+        Cell(type=CellType.FLOAT32, access=True, value=17841),
+        Cell(type=CellType.NEXT, access=True, value=29061),
+        Cell(type=CellType.FLOAT32, access=True, value=17841),
+        Cell(type=CellType.NEXT, access=True, value=29061),
+        Cell(type=CellType.FLOAT32, value=18600, action=1),
+        Cell(type=CellType.NEXT, value=29958),  # 40
+        Cell(type=CellType.FLOAT32, value=18600, action=1),
+        Cell(type=CellType.NEXT, value=29958),
         Cell(type=CellType.STRING, value=int.from_bytes(bytes("St", "utf-8"), "big")),
         Cell(type=CellType.NEXT, value=int.from_bytes(bytes("r ", "utf-8"), "big")),
         Cell(type=CellType.STRING, value=int.from_bytes(bytes("St", "utf-8"), "big")),