Testing polling for the Watlow F4SD; register #100

Signed-off-by: mharb <mharb@noreply.localhost>

watlow-f4sd/ModbusWatlowRamp/ModbusWatlowRamp.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="NModbus4.NetCore" Version="3.0.0" />
+  </ItemGroup>
+
+</Project>

watlow-f4sd/ModbusWatlowRamp/ModbusWatlowRamp.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.14.36121.58 d17.14
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ModbusWatlowRamp", "ModbusWatlowRamp.csproj", "{138F9A2D-5D63-4303-87AD-9C131B93BA62}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{138F9A2D-5D63-4303-87AD-9C131B93BA62}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{138F9A2D-5D63-4303-87AD-9C131B93BA62}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{138F9A2D-5D63-4303-87AD-9C131B93BA62}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{138F9A2D-5D63-4303-87AD-9C131B93BA62}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {986BB29F-AC51-4EA5-9A56-1400A2778A90}
+	EndGlobalSection
+EndGlobal

watlow-f4sd/ModbusWatlowRamp/Program.cs

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+using Modbus.Device; // NModbus namespace
+using System.Net.Sockets;
+
+internal class Program
+{
+    // Configuration
+    private const string hostname = "127.0.0.1"; // Replace with your Watlow F4 IP
+
+    private const int port = 502;
+    private const byte slaveId = 0;
+
+    // Register 100 should be the first read-only input on the F4
+    // Value 99 or 100 should work depending on zero indexing
+    private const ushort loadRegister = 99;
+
+    private static void Main(string[] args)
+    {
+        TcpClient tcpClient = null;
+        ModbusIpMaster master = null;
+
+        try
+        {
+            // Initialize connection
+            tcpClient = new TcpClient(hostname, port);
+            master = ModbusIpMaster.CreateIp(tcpClient);
+
+            // Monitor continuously
+            while (true)
+            {
+                // Check for Escape key press
+                if (Console.KeyAvailable)
+                {
+                    ConsoleKeyInfo key = Console.ReadKey(true);
+                    if (key.Key == ConsoleKey.Escape)
+                    {
+                        Console.WriteLine("Escape pressed. Exiting...");
+                        break;
+                    }
+                }
+
+                try
+                {
+                    // Read load value (holding register)
+                    ushort[] registers = master.ReadHoldingRegisters(slaveId, loadRegister, 1);
+                    int load = registers[0];
+
+                    // Display load info
+                    DisplayLoadInfo(load);
+
+                    // Pause before next read
+                    Thread.Sleep(1000);
+                }
+                catch (Exception ex)
+                {
+                    Console.WriteLine($"Error: {ex.Message}");
+                    break;
+                }
+            }
+        }
+        catch (Exception ex)
+        {
+            Console.WriteLine($"Initialization error: {ex.Message}");
+        }
+        finally
+        {
+            // Clean up
+            master?.Dispose();
+            tcpClient?.Close();
+        }
+    }
+
+    private static void DisplayLoadInfo(int load)
+    {
+        Console.Clear(); // Clears the console
+
+        // Assume load is 0-65535 for 0.00-100.00% (16-bit range)
+        int percent = (int)load / 65535 * 100;
+        int barLength = (int)(percent / 2); // Scale to 50 chars for console
+
+        Console.WriteLine($"Load Value: {load}");
+        Console.WriteLine($"Load Percentage: {percent:F2}%");
+        Console.Write("Bar Graph: [");
+        Console.Write(new string('=', barLength));
+        Console.Write(new string(' ', 50 - barLength));
+        Console.WriteLine("]");
+        Console.WriteLine("\nHold ESC to exit.");
+    }
+}