diff --git a/CSI-H238M/CSI-H238M/Services/ModbusService.cs b/CSI-H238M/CSI-H238M/Services/ModbusService.cs
index 5461415..3dd4fd4 100644
--- a/CSI-H238M/CSI-H238M/Services/ModbusService.cs
+++ b/CSI-H238M/CSI-H238M/Services/ModbusService.cs
@@ -1138,9 +1138,9 @@ namespace COFTester.Services
                 var forceRegisters = await _modbusMaster.ReadHoldingRegistersAsync(
                     _config.SlaveId, _config.FrictionForceRegister, 2);
                 
-                // 讀取 D360 位移（2個寄存器）
+                // 讀取 D16 位移（2個寄存器）
                 var displacementRegisters = await _modbusMaster.ReadHoldingRegistersAsync(
-                    _config.SlaveId, _config.CurveDisplacementRegister, 2);
+                    _config.SlaveId, _config.HorizontalPositionRegister, 2);
 
                 return new TestDataPoint
                 {