Modbus.Net/Tests/Modbus.Net.Tests/ModbusMultiStationTest.cs

using Microsoft.VisualStudio.TestTools.UnitTesting;
using Modbus.Net.Modbus;
using AddressUnit = Modbus.Net.AddressUnit<string, int, int>;

namespace Modbus.Net.Tests
{
    /// <summary>
    /// Modbus 多从站测试类
    /// 测试在同一串口上访问多个 Modbus RTU 从站
    /// </summary>
    [TestClass]
    public class ModbusMultiStationTest
    {
        // Modbus RTU 机器实例（从站 1）
        private BaseMachine<string, string>? _modbusRtuMachine1;

        // Modbus RTU 机器实例（从站 2）
        private BaseMachine<string, string>? _modbusRtuMachine2;

        // 测试串口
        private string _machineCom = "COM1";

        /// <summary>
        /// 测试初始化方法
        /// 创建两个不同从站地址的 Modbus RTU 机器实例
        /// </summary>
        [TestInitialize]
        public void Init()
        {
            // 创建从站地址为 1 的 Modbus RTU 机器
            _modbusRtuMachine1 = new ModbusMachine<string, string>("1", "", ModbusType.Rtu, _machineCom, null, true, 1, 0, Endian.BigEndianLsb);
            
            // 创建从站地址为 2 的 Modbus RTU 机器
            _modbusRtuMachine2 = new ModbusMachine<string, string>("2", "", ModbusType.Rtu, _machineCom, null, true, 2, 0, Endian.BigEndianLsb);
        }

        /// <summary>
        /// 测试多从站读写
        /// 验证在同一串口上可以分别访问不同从站地址的设备
        /// </summary>
        [TestMethod]
        public async Task MultiStation()
        {
            // 定义地址单元列表
            var addresses = new List<AddressUnit>
            {
                new AddressUnit
                {
                    Id = "0",
                    Area = "4X",
                    Address = 2,
                    SubAddress = 0,
                    CommunicationTag = "A1",
                    DataType = typeof(ushort)
                },
                new AddressUnit
                {
                    Id = "1",
                    Area = "4X",
                    Address = 3,
                    SubAddress = 0,
                    CommunicationTag = "A2",
                    DataType = typeof(ushort)
                },
                new AddressUnit
                {
                    Id = "2",
                    Area = "4X",
                    Address = 4,
                    SubAddress = 0,
                    CommunicationTag = "A3",
                    DataType = typeof(ushort)
                },
                new AddressUnit
                {
                    Id = "3",
                    Area = "4X",
                    Address = 5,
                    SubAddress = 0,
                    CommunicationTag = "A4",
                    DataType = typeof(ushort)
                },
                new AddressUnit
                {
                    Id = "4",
                    Area = "4X",
                    Address = 6,
                    SubAddress = 0,
                    CommunicationTag = "A5",
                    DataType = typeof(uint)
                },
                new AddressUnit
                {
                    Id = "5",
                    Area = "4X",
                    Address = 8,
                    SubAddress = 0,
                    CommunicationTag = "A6",
                    DataType = typeof(uint)
                }
            };

            // 设置两个从站的地址列表
            _modbusRtuMachine1!.GetAddresses = addresses.ToList();
            _modbusRtuMachine2!.GetAddresses = addresses.ToList();

            Random r = new Random();
            
            // 生成从站 1 的随机数据
            var dic1 = new Dictionary<string, double>()
            {
                { "A1", r.Next(0, UInt16.MaxValue) },
                { "A2", r.Next(0, UInt16.MaxValue) },
                { "A3", r.Next(0, UInt16.MaxValue) },
                { "A4", r.Next(0, UInt16.MaxValue) },
                { "A5", r.Next() },  // uint 类型
                { "A6", r.Next() }   // uint 类型
            };

            // 生成从站 2 的随机数据
            var dic2 = new Dictionary<string, double>()
            {
                { "A1", r.Next(0, UInt16.MaxValue) },
                { "A2", r.Next(0, UInt16.MaxValue) },
                { "A3", r.Next(0, UInt16.MaxValue) },
                { "A4", r.Next(0, UInt16.MaxValue) },
                { "A5", r.Next() },
                { "A6", r.Next() }
            };

            // 分别向两个从站写入不同的数据
            await _modbusRtuMachine1.SetDatasAsync(MachineDataType.CommunicationTag, dic1);
            await _modbusRtuMachine2.SetDatasAsync(MachineDataType.CommunicationTag, dic2);

            // 分别从两个从站读取数据
            var ans = await _modbusRtuMachine1.GetDatasAsync(MachineDataType.CommunicationTag);
            var ans2 = await _modbusRtuMachine2.GetDatasAsync(MachineDataType.CommunicationTag);

            // 断开连接
            _modbusRtuMachine1.Disconnect();
            _modbusRtuMachine2.Disconnect();

            // 验证从站 1 读取的数据与写入的一致
            Assert.AreEqual(ans.Datas["A1"].DeviceValue, dic1["A1"]);
            Assert.AreEqual(ans2.Datas["A1"].DeviceValue, dic2["A1"]);
            Assert.AreEqual(ans.Datas["A2"].DeviceValue, dic1["A2"]);
            Assert.AreEqual(ans2.Datas["A2"].DeviceValue, dic2["A2"]);
            Assert.AreEqual(ans.Datas["A3"].DeviceValue, dic1["A3"]);
            Assert.AreEqual(ans2.Datas["A3"].DeviceValue, dic2["A3"]);
            Assert.AreEqual(ans.Datas["A4"].DeviceValue, dic1["A4"]);
            Assert.AreEqual(ans2.Datas["A4"].DeviceValue, dic2["A4"]);
            Assert.AreEqual(ans.Datas["A5"].DeviceValue, dic1["A5"]);
            Assert.AreEqual(ans2.Datas["A5"].DeviceValue, dic2["A5"]);
            Assert.AreEqual(ans.Datas["A6"].DeviceValue, dic1["A6"]);
            Assert.AreEqual(ans2.Datas["A6"].DeviceValue, dic2["A6"]);
        }
    }
}