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- Finding I2C connected devices
- I2C connect 20x4 LCD(LiquidCrystalDisplay)
- I2C connect 4 Button Keypad with Ardunio
- Serial communication with Voltage & Current Sensor
- Simple On-OFF push button with LED
- Single phase Square Wave Generator Up to 1MHz
- Using Arduino board as ISP to program ATmega328 IC without a crystal
- Method 2- Boot Atmega328 with ISP to program ATmega328 IC with a crystal.md
- Differential Input Signal Circuit - 12v to 5v.md
- ULN2003 for 12v relay and MCU controlled - 5v to 12v.md
- Measuring Air Pressure HX710B with MCU.md
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## RS485Click to expand!
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##Communicate with multiple RS485 devices over an RS485-to-Ethernet converter using the Modbus RTU over TCP or a custom protocol depending on your devices. Here's a high-level plan for your application: Steps to Build
Are your RS485 devices using Modbus RTU over TCP If Modbus, use a library like NModbus.
Communicate via TCP/IP to the RS485-to-Ethernet converter. Get the IP address and port of the converter. Implement socket programming if needed.
Loop through each RS485 device address. Send requests & process responses.
Based on logic, send specific commands to each device. Handle acknowledgment & error checking.
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Here is a structured C# program that includes: ✅ Scanning all RS485 devices connected via an RS485-to-Ethernet converter ✅ Assigning device IDs using software configuration ✅ Sending commands to a particular device by ID ✅ Receiving data from a particular device by ID ✅ Reading data from all devices ✅ Sending data to all devices ✅ Auto-reconnect mechanism in case of disconnection
The program is written using Modbus TCP (NModbus4 library). If your devices use a custom protocol, I can modify it accordingly.
- Install Required Library Run this command in NuGet Package Manager Console:
Install-Package NModbus4
- Full C# Program Here’s the complete structured program:
using System;
using System.Net.Sockets;
using System.Threading;
using NModbus;
class RS485Manager
{
private string converterIP = "192.168.1.100"; // Change to your RS485-to-Ethernet Converter IP
private int port = 502; // Default Modbus TCP port
private TcpClient client;
private IModbusMaster master;
public RS485Manager()
{
Connect();
}
// Auto-reconnect mechanism
private void Connect()
{
while (true)
{
try
{
if (client != null && client.Connected)
return;
Console.WriteLine("Connecting to RS485-to-Ethernet converter...");
client = new TcpClient(converterIP, port);
var factory = new ModbusFactory();
master = factory.CreateMaster(client.GetStream());
Console.WriteLine("Connected successfully!");
break;
}
catch (Exception ex)
{
Console.WriteLine($"Connection failed: {ex.Message}, Retrying in 5 seconds...");
Thread.Sleep(5000);
}
}
}
// 1. Scan for Active Devices
public void ScanDevices()
{
Console.WriteLine("\nScanning for RS485 devices...");
for (byte address = 1; address <= 247; address++)
{
try
{
ushort[] registers = master.ReadHoldingRegisters(address, 0, 1);
Console.WriteLine($"Device found at Address: {address}");
}
catch
{
// No response, ignore
}
}
}
// 2. Assign Device ID (Software Configuration)
public void AssignDeviceID(byte oldAddress, byte newAddress)
{
try
{
master.WriteSingleRegister(oldAddress, 0, newAddress);
Console.WriteLine($"Device {oldAddress} ID changed to {newAddress}");
}
catch (Exception ex)
{
Console.WriteLine($"Failed to change device ID: {ex.Message}");
}
}
// 3. Read Data from a Particular Device
public void ReadDataFromDevice(byte deviceID)
{
try
{
ushort[] registers = master.ReadHoldingRegisters(deviceID, 0, 2);
Console.WriteLine($"Device {deviceID} Data: {string.Join(", ", registers)}");
}
catch (Exception ex)
{
Console.WriteLine($"Error reading from Device {deviceID}: {ex.Message}");
}
}
// 4. Send Command to a Particular Device
public void SendCommandToDevice(byte deviceID, ushort command)
{
try
{
master.WriteSingleRegister(deviceID, 1, command);
Console.WriteLine($"Command {command} sent to Device {deviceID}");
}
catch (Exception ex)
{
Console.WriteLine($"Error sending command to Device {deviceID}: {ex.Message}");
}
}
// 5. Read Data from All Devices
public void ReadAllDevices(byte[] deviceAddresses)
{
foreach (byte address in deviceAddresses)
{
ReadDataFromDevice(address);
}
}
// 6. Send Data to All Devices
public void SendDataToAllDevices(byte[] deviceAddresses, ushort command)
{
foreach (byte address in deviceAddresses)
{
SendCommandToDevice(address, command);
}
}
}
class Program
{
static void Main()
{
RS485Manager rs485 = new RS485Manager();
// 1. Scan for Devices
rs485.ScanDevices();
// 2. Assign a new device ID (Example: Change device ID 1 to 10)
rs485.AssignDeviceID(1, 10);
// 3. Read data from a specific device (Example: Read from ID 10)
rs485.ReadDataFromDevice(10);
// 4. Send command to a specific device (Example: Send command 50 to ID 10)
rs485.SendCommandToDevice(10, 50);
// 5. Read data from all devices
byte[] deviceList = { 10, 2, 3 }; // Example list of device addresses
rs485.ReadAllDevices(deviceList);
// 6. Send command to all devices (Example: Send command 75 to all devices)
rs485.SendDataToAllDevices(deviceList, 75);
Console.WriteLine("\nProcess Complete!");
Console.ReadKey();
}
}
💡 Explanation of the Code: ✅ Auto-reconnect feature: If the connection to the RS485-to-Ethernet converter fails, it retries every 5 seconds. ✅ Scanning all devices: Loops through all possible addresses (1-247) to find active RS485 devices. ✅ Assigning new device IDs: Changes a device’s ID from oldAddress to newAddress using Modbus register. ✅ Reading data from a single device: Reads holding registers of a specific device. ✅ Sending commands to a specific device: Writes a single register (for example, turning ON/OFF a relay). ✅ Reading data from all devices: Iterates through a list of device addresses and reads data. ✅ Sending data to all devices: Sends the same command to multiple devices.
🚀 How to Use the Program Modify the IP Address (converterIP = "192.168.1.100") to match your RS485-to-Ethernet converter. Run the program → It will automatically scan all RS485 devices. Assign device IDs as needed. Send & receive data from any specific device or all devices.
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| Name | Pins | Input Pins | Output pins | Oprating Volts | Amps | ANODE/CATHODE/EMITTER/COLLECTOR/GATE |
|---|---|---|---|---|---|---|
| TLP281 | 4 | 2 | 2 | 5 V-dc AN-CA | 300 mah | 5-9 v-dc / EM-CL |
| TLP281-4 | 16 | 8 | 8 | 5V-dc AN-CA | 300 mah | 5-9 v-dc / EM-CL |
| Name | Pins | Input Pins | Output pins | Oprating Volts | Amps | ANODE/CATHODE/EMITTER/COLLECTOR/GATE |
|---|---|---|---|---|---|---|
| ULN2003 | 16 | 8 | 8 | 5 V-dc AN-CA | 500 mah | 5-9 v-dc / EM-CL |
| ULN2803APG | 16 | 8 | 8 | 5 V-dc AN-CA | 500 mah | 5-9 v-dc / EM-CL |
| Name | Pins | Input Pins | Output pins | Oprating Volts |
|---|---|---|---|---|
| PCF8574 | 16 | 8 | 4 | 5 V-dc AN-CA |
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