上から
tbCommand [TextBox]: crc-16を除くコマンドを入力する。16進数表記の2文字で1バイト 。
cbxPortName [ComboBox]: 使用できるCOMポート名の一覧を表示・選択する。
btnSend [button]: 送信ボタン
rtbLog [RichTextBox]: 送信したコマンドと、受信したレスポンスの内容を表示する。
あと、絵にないけど
serialPort1 [SerialPort]: COMポートオブジェクト。
frmMain.csのコード
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO.Ports;
namespace SimpleModbusRtu
{
public partial class frmMain : Form
{
private System.Timers.Timer timerSilentInterval = new System.Timers.Timer();
private System.Timers.Timer timerNoResponse = new System.Timers.Timer();
private enum MasterStatus
{
NotInitialized = 0,
Initialized,
Communicating,
DataReceived,
ErrorReceived,
NoResponseTimeout
};
private MasterStatus status = MasterStatus.NotInitialized;
private string strResponse;
/// <summary>
/// コンストラクタ
/// </summary>
public frmMain()
{
InitializeComponent();
}
/// <summary>
/// フォームが読み込まれたとき
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void Form1_Load(object sender, EventArgs e)
{
status = MasterStatus.NotInitialized;
timerNoResponse.AutoReset = false;
timerNoResponse.Interval = 1000;
timerNoResponse.Elapsed += new System.Timers.ElapsedEventHandler(timerNoResponse_Elapsed);
timerSilentInterval.AutoReset = false;
timerSilentInterval.Interval = 10;
timerSilentInterval.Elapsed += new System.Timers.ElapsedEventHandler(timerSilentInterval_Elapsed);
string[] ports = SerialPort.GetPortNames();
if (ports.Length > 0) {
cbxPortName.Items.AddRange(ports);
cbxPortName.SelectedIndex = 0;
serialPort1.DataReceived += new SerialDataReceivedEventHandler(serialPort1_DataReceived);
serialPort1.ErrorReceived += new SerialErrorReceivedEventHandler(serialPort1_ErrorReceived);
status = MasterStatus.Initialized;
} else {
MessageBox.Show("COMポートがないので終了します");
Application.Exit();
}
tbCommand.Clear();
rtbLog.Clear();
}
/// <summary>
/// 受信エラー(パリティエラー／フレーミングエラー)のとき
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
void serialPort1_ErrorReceived(object sender, SerialErrorReceivedEventArgs e)
{
timerNoResponse.Stop();
timerSilentInterval.Stop();
strResponse = "受信エラー";
status = MasterStatus.ErrorReceived;
}
/// <summary>
/// 1バイト受信時
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
timerNoResponse.Stop();
timerSilentInterval.Stop();
timerSilentInterval.Start();
}
/// <summary>
/// 文字間タイマ＝受信完了
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
void timerSilentInterval_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
{
int size = serialPort1.BytesToRead;
byte[] bytes = new byte[size];
serialPort1.Read(bytes, 0, size);
strResponse = ByteArrayToHexString(bytes);
status = MasterStatus.DataReceived;
}
/// <summary>
/// レスポンスなしのタイムアウト
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
void timerNoResponse_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
{
strResponse = string.Empty;
status = MasterStatus.NoResponseTimeout;
}
/// <summary>
/// バイト配列を文字列化
/// </summary>
/// <param name="bytes"></param>
/// <returns></returns>
private string ByteArrayToHexString(byte[] bytes)
{
string rtn = string.Empty;
foreach (byte b in bytes) {
rtn += b.ToString("X2");
}
return rtn;
}
/// <summary>
/// 送信ボタンを押したとき
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnSend_Click(object sender, EventArgs e)
{
if (status == MasterStatus.NotInitialized) {
return;
}
byte[] command = new byte[tbCommand.Text.Length / 2];
try {
command = AddCrc(HexStringToByteArray(tbCommand.Text));
} catch (Exception ex) {
MessageBox.Show("コマンド作成に失敗。" + Environment.NewLine + ex.ToString());
return;
}
try {
status = MasterStatus.Communicating;
serialPort1.PortName = cbxPortName.Text;
serialPort1.BaudRate = 38400;
serialPort1.Parity = Parity.Even;
serialPort1.DataBits = 8;
serialPort1.StopBits = StopBits.One;
serialPort1.Open();
serialPort1.Write(command, 0, command.Length);
Log(ByteArrayToHexString(command), Color.Green);
timerNoResponse.Start();
while (status == MasterStatus.Communicating) {
Application.DoEvents();
}
switch (status) {
case MasterStatus.DataReceived:
Log(strResponse, Color.Blue);
break;
case MasterStatus.NoResponseTimeout:
Log("受信なしのタイムアウト", Color.Orange);
break;
case MasterStatus.ErrorReceived:
Log("受信エラー発生", Color.Red);
break;
default:
break;
};
} catch (Exception ex) {
MessageBox.Show("コマンド送受信に失敗" + Environment.NewLine + ex.ToString());
} finally {
serialPort1.Close();
}
}
/// <summary>
/// 16進表記文字列をバイト配列へ
/// </summary>
/// <param name="s"></param>
/// <returns></returns>
private byte[] HexStringToByteArray(string s)
{
try {
byte[] buf = new byte[s.Length / 2];
for (int i = 0; i < s.Length; i += 2) {
buf[i / 2] = (byte)Convert.ToByte(s.Substring(i, 2), 16);
}
return buf;
} catch (Exception ex) {
throw ex;
}
}
/// <summary>
/// CRC-16を付加する
/// </summary>
/// <param name="bytes"></param>
/// <returns></returns>
private byte[] AddCrc(byte[] bytes)
{
byte[] buff = new byte[bytes.Length + 2];
byte[] crc = CalCrc(bytes);
bytes.CopyTo(buff, 0);
crc.CopyTo(buff, bytes.Length);
return buff;
}
/// <summary>
/// CRCの計算。戻り値はCRCの2バイトのみ
/// </summary>
/// <param name="a_command">コマンドのバイト配列</param>
/// <returns>CRC 2バイトのみ</returns>
private byte[] CalCrc(byte[] a_command)
{
ushort[] crc_table = {
0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241,
0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481, 0x0440,
0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40,
0x0A00, 0xCAC1, 0xCB81, 0x0B40, 0xC901, 0x09C0, 0x0880, 0xC841,
0xD801, 0x18C0, 0x1980, 0xD941, 0x1B00, 0xDBC1, 0xDA81, 0x1A40,
0x1E00, 0xDEC1, 0xDF81, 0x1F40, 0xDD01, 0x1DC0, 0x1C80, 0xDC41,
0x1400, 0xD4C1, 0xD581, 0x1540, 0xD701, 0x17C0, 0x1680, 0xD641,
0xD201, 0x12C0, 0x1380, 0xD341, 0x1100, 0xD1C1, 0xD081, 0x1040,
0xF001, 0x30C0, 0x3180, 0xF141, 0x3300, 0xF3C1, 0xF281, 0x3240,
0x3600, 0xF6C1, 0xF781, 0x3740, 0xF501, 0x35C0, 0x3480, 0xF441,
0x3C00, 0xFCC1, 0xFD81, 0x3D40, 0xFF01, 0x3FC0, 0x3E80, 0xFE41,
0xFA01, 0x3AC0, 0x3B80, 0xFB41, 0x3900, 0xF9C1, 0xF881, 0x3840,
0x2800, 0xE8C1, 0xE981, 0x2940, 0xEB01, 0x2BC0, 0x2A80, 0xEA41,
0xEE01, 0x2EC0, 0x2F80, 0xEF41, 0x2D00, 0xEDC1, 0xEC81, 0x2C40,
0xE401, 0x24C0, 0x2580, 0xE541, 0x2700, 0xE7C1, 0xE681, 0x2640,
0x2200, 0xE2C1, 0xE381, 0x2340, 0xE101, 0x21C0, 0x2080, 0xE041,
0xA001, 0x60C0, 0x6180, 0xA141, 0x6300, 0xA3C1, 0xA281, 0x6240,
0x6600, 0xA6C1, 0xA781, 0x6740, 0xA501, 0x65C0, 0x6480, 0xA441,
0x6C00, 0xACC1, 0xAD81, 0x6D40, 0xAF01, 0x6FC0, 0x6E80, 0xAE41,
0xAA01, 0x6AC0, 0x6B80, 0xAB41, 0x6900, 0xA9C1, 0xA881, 0x6840,
0x7800, 0xB8C1, 0xB981, 0x7940, 0xBB01, 0x7BC0, 0x7A80, 0xBA41,
0xBE01, 0x7EC0, 0x7F80, 0xBF41, 0x7D00, 0xBDC1, 0xBC81, 0x7C40,
0xB401, 0x74C0, 0x7580, 0xB541, 0x7700, 0xB7C1, 0xB681, 0x7640,
0x7200, 0xB2C1, 0xB381, 0x7340, 0xB101, 0x71C0, 0x7080, 0xB041,
0x5000, 0x90C1, 0x9181, 0x5140, 0x9301, 0x53C0, 0x5280, 0x9241,
0x9601, 0x56C0, 0x5780, 0x9741, 0x5500, 0x95C1, 0x9481, 0x5440,
0x9C01, 0x5CC0, 0x5D80, 0x9D41, 0x5F00, 0x9FC1, 0x9E81, 0x5E40,
0x5A00, 0x9AC1, 0x9B81, 0x5B40, 0x9901, 0x59C0, 0x5880, 0x9841,
0x8801, 0x48C0, 0x4980, 0x8941, 0x4B00, 0x8BC1, 0x8A81, 0x4A40,
0x4E00, 0x8EC1, 0x8F81, 0x4F40, 0x8D01, 0x4DC0, 0x4C80, 0x8C41,
0x4400, 0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680, 0x8641,
0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081, 0x4040
};
ushort us_crc = 0xffff;
byte[] ba_crc = new byte[2];
for (int i = 0; i < a_command.Length; i++) {
us_crc ^= a_command[i];
ba_crc = System.BitConverter.GetBytes(us_crc);
us_crc = (ushort)(crc_table[ba_crc[0]] ^ ba_crc[1]);
}
return System.BitConverter.GetBytes(us_crc);
}
/// <summary>
/// 送受信内容を表示する
/// </summary>
/// <param name="s"></param>
/// <param name="c"></param>
private void Log(string s, Color c)
{
rtbLog.Select(rtbLog.Text.Length, 0);
rtbLog.SelectedText = string.Empty;
rtbLog.SelectionFont = new Font(rtbLog.SelectionFont, FontStyle.Regular);
rtbLog.SelectionColor = c;
rtbLog.AppendText(s + Environment.NewLine);
rtbLog.ScrollToCaret();
}
}
}
参考にさせていただき 簡易調節計と接続できました。
返信削除ありがとうございます。