泓格WINPAC主机与第三方模块rs 485 modbus rtu通信测试

开发语言：C#

开发环境：VS2008（支持WINCE开发的最后一个版本）

运行环境：Windows CE 5.0~7.0

项目说明：多台涨格winpac系列的主机，原来使用泓格SDK开发的程序，采集7018系列模块的数据，主要有7018R和7018Z。现客户要求增加一个温湿度模块，此模块支持rs485 modbus rtu通讯。

首先尝试使用SDK方法，可以读取7018模块的数据，却读不到温湿度模块的数据，代码如下：

void Main()
{
        var remoteIOPort = PACNET.UART.Open("COM2,9600");
        var cmd = Encoding.ASCII.GetBytes("#01\r");
        send(cmd, 0); //可以正常读取7018
        send(cmd, 1); //可以正常读取7018
        cmd = new byte[] { 0x65, 0x04, 0x00, 0x01, 0x00, 0x01, 0x68, 0x2E };
        send(cmd, 1);  //不能读取温湿度模块
}

        void send(byte[] cmd, int type)
        {
            if (type == 0)
            {
                float[] fValue = new float[10];
                var readResult = PACNET.PAC_IO.ReadAIAll(remoteIOPort, PACNET.PAC_IO.PAC_REMOTE_IO(1), fValue);
                foreach (var item in fValue)
                {
                    appendText(item);
                }
            }
            else if (type == 1)
            {
                var buffer = new byte[72];
                PACNET.UART.SendCmdExt(remoteIOPort, cmd, (uint)cmd.Length, buffer, (uint)buffer.Length);
                appendText(BitConverter.ToString(buffer));
            }
        }

直接读写串口，测试成功。代码如下：

using System;

using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO.Ports;
using System.Threading;

namespace TESTSERIALPORT
{
    public partial class FrmSerialPort : Form
    {
        SerialPort serial;

        public FrmSerialPort()
        {
            InitializeComponent();
            serial = new SerialPort("COM2", 9600, Parity.None, 8, StopBits.One);
            serial.Open();
        }

        private void btnWrite_Click(object sender, EventArgs e)
        {
            serial.ReadTimeout = 1000;
            serial.WriteTimeout = 1000;
            if (!serial.IsOpen)
            {
                serial.Open();
                appendText(serial.PortName);
                appendText(serial.BaudRate);
                appendText(serial.Parity);
                appendText(serial.DataBits);
                appendText(serial.StopBits);
                appendText(serial.IsOpen);
            }

            var cmd = Encoding.ASCII.GetBytes("#01\r");
            send(cmd, 1);
            cmd = new byte[] { 0x65, 0x04, 0x00, 0x01, 0x00, 0x01, 0x68, 0x2E };
            send(cmd, 1);
            cmd = new byte[] { 0x65, 0x04, 0x00, 0x02, 0x00, 0x01, 0x98, 0x2E };
            send(cmd, 1);
        }

        void send(byte[] cmd, int type)
        {
            serial.Write(cmd, 0, cmd.Length);
            Thread.Sleep(300);
            var size = serial.BytesToRead;
            appendText(size);

            var buffer = new byte[size];
            var result = serial.Read(buffer, 0, size);
            if (type == 0)
            {
                appendText(PACNET.MISC.WideString(buffer));
            }
            else if (type == 1)
            {
                appendText(BitConverter.ToString(buffer));
            }
        }

        void appendText(object obj)
        {
            textBox1.Text += obj.ToString() + "\r\n";
        }
    }
}

原文地址：https://www.cnblogs.com/qq812256/p/12205209.html