Nurah.lee

 Get Started with Virtual Serial Port Control -  Virtual Serial Port Control - Quick Start (virtual-serial-port-control.com) DLL API Integration -  Virtual Serial Port Control SDK - DLL API Integration (virtual-serial-port-control.com) ActiveX Component Integration -  Virtual Serial Port Control SDK - ActiveX Component Integration (virtual-serial-port-control.com) Microsoft Visual Studio 2005, Visual C# -  Virtual Serial Port Control SDK - Microsoft Visual Studio 2005, Visual C# (virtual-serial-port-control.com) using System; using System.Net.Sockets; using System.Threading; class Program {     static void Main()     {         string host = "192.168.8.202"; // Set IP         int port = 4196;               // Set port         byte[] cmd = new byte[8];         cmd[0] = 0x01;  // Device address         cmd[1] = 0x05;  // Command         using (Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp))         {             s.Connect(host, port); // C

  Product datasheet - 8-ch Ethernet Relay Module, Modbus RTU/Modbus TCP Protocol, PoE port Communication, With Various Isolation And Protection Circuits - https://www.waveshare.com/modbus-poe-eth-relay.htm Documentation Modbus POE ETH Relay -  https://www.waveshare.com/wiki/Modbus_POE_ETH_Relay   help me about read data by using modbus c# -  https://www.plctalk.net/threads/help-me-about-read-data-by-using-modbus-c.95485/ Advantech User Manual PCI-1761 - 8-ch Relay & 8-ch Isolated Digital Input PCI Card -  https://advdownload.advantech.com/productfile/Downloadfile1/1-11P6657/PCI-1761.pdf +++ Check modbus using Wireshark