92 lines
3.3 KiB
C#
92 lines
3.3 KiB
C#
using Microsoft.VisualStudio.TestTools.UnitTesting;
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using Modbus.Net.Modbus;
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using AddressUnit = Modbus.Net.AddressUnit<string, int, int>;
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namespace Modbus.Net.Tests
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{
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/// <summary>
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/// 字节序测试类
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/// 测试 Modbus 大端和小端字节序的读写差异
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/// </summary>
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[TestClass]
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public class EndianTest
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{
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// Modbus TCP 机器实例（大端）
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private BaseMachine<string, string>? _modbusTcpMachine;
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// Modbus TCP 机器实例（小端）
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private BaseMachine<string, string>? _modbusTcpMachine2;
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// 测试机器 IP 地址
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private string _machineIp = "10.10.18.251";
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/// <summary>
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/// 测试初始化方法
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/// 创建大端和小端两种字节序的 Modbus TCP 机器实例
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/// </summary>
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[TestInitialize]
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public void Init()
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{
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// 创建大端字节序的 Modbus TCP 机器
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_modbusTcpMachine = new ModbusMachine<string, string>("1", "", ModbusType.Tcp, _machineIp, null, true, 1, 0, Endian.BigEndianLsb);
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// 创建小端字节序的 Modbus TCP 机器
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_modbusTcpMachine2 = new ModbusMachine<string, string>("2", "", ModbusType.Tcp, _machineIp, null, true, 1, 0, Endian.LittleEndianLsb);
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}
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/// <summary>
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/// 测试 Modbus 字节序
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/// 验证大端和小端字节序对同一数据的读写差异
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/// </summary>
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[TestMethod]
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public async Task ModbusEndianSingle()
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{
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Random r = new Random();
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// 定义地址单元
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var addresses = new List<AddressUnit>
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{
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new AddressUnit
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{
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Id = "0",
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Area = "4X",
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Address = 1,
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SubAddress = 0,
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CommunicationTag = "A1",
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DataType = typeof(ushort)
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}
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};
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// 生成随机值
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var dic1 = new Dictionary<string, double>()
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{
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{
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"4X 1", r.Next(0, UInt16.MaxValue)
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}
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};
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// 设置两种字节序机器的地址列表
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_modbusTcpMachine!.GetAddresses = addresses;
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_modbusTcpMachine2!.GetAddresses = addresses;
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// 使用大端字节序写入数据
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await _modbusTcpMachine.SetDatasAsync(MachineDataType.Address, dic1);
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// 使用大端字节序读取数据
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var ans = await _modbusTcpMachine.GetDatasAsync(MachineDataType.Address);
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_modbusTcpMachine.Disconnect();
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// 使用小端字节序读取同一数据
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var ans2 = await _modbusTcpMachine2.GetDatasAsync(MachineDataType.Address);
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// 验证大端读取的值与写入的值一致
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Assert.AreEqual(ans.Datas["4X 1.0"].DeviceValue, dic1["4X 1"]);
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// 验证小端读取的值是字节交换后的值
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// 例如：0x1234 在大端是 [0x12, 0x34]，在小端会被解读为 [0x34, 0x12] = 0x3412
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// 计算公式：低字节*256 + 高字节
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Assert.AreEqual(ans2.Datas["4X 1.0"].DeviceValue, (ushort)dic1["4X 1"] % 256 * 256 + (ushort)dic1["4X 1"] / 256);
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}
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}
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}
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