modbusClient.ReadCoils

[Anonymous]

I want to perform the status of a digital input, but the value that returns is false.

Coil value # I1: is always True

The sample code:

using System;
using EasyModbus;

namespace ModbusRS485Master
{
    class Program
    {
        public static void Main(string[] args)
        {
            ModbusClient modbusClient = new ModbusClient("COM3");
            modbusClient.UnitIdentifier = 1;// Not necessary since default slaveID = 1;
            modbusClient.Baudrate = 38400;  // Not necessary since default baudrate = 9600
            modbusClient.Parity = System.IO.Ports.Parity.None;
            modbusClient.StopBits = System.IO.Ports.StopBits.Two;
            modbusClient.ConnectionTimeout = 3000;
            modbusClient.Connect();
            string teste = "";
            while (teste != "false")
            {
                //Console.WriteLine("Value of Discr. Input #1: " + modbusClient.ReadDiscreteInputs(11264, 1)[0].ToString());  //Reads Discrete Input #1
                //Console.WriteLine("Value of Input Reg. #10: " + modbusClient.ReadInputRegisters(11264, 1)[0].ToString());   //Reads Inp. Reg. #10

                  modbusClient.WriteSingleCoil(11136, true);      // Writes Coil #5
                                                                  // modbusClient.WriteSingleRegister(19, 4711); //Writes Holding Reg. #20
                  teste = modbusClient.ReadCoils(11264,1)[0].ToString();

                  Console.WriteLine("Value of Coil # I1: " + modbusClient.ReadCoils(11264,1)[0].ToString());

            }
            Console.Write("Press any key to continue . . . ");
            Console.ReadKey(true);
        }
    }
}

[Rossmann Engineering]

Hi!

I was just trying, and it worked perfectly. Are you sure about connection parameter (Baudrate, Parity, stopbits)?

But your while loop does not work, because you are casting a bool value to a string, and then compare. But the .ToString returns "False" if the coil turned to zero (Note the Capital letter "F".

But it would be better to compare the "bool" value:

bool teste = true;
while (teste != false)
{
......
teste = modbusClient.ReadCoils(11264,1)[0];
}