Hi：
I want to read data from s7 200 serial port by libnodave.I find that sometimes read normally,sometiems read error return -1025 show timeout when continuous read .why ?I writed by C# and delphi ,but results are the same .ppi cable is diy .
thanks,everybody!
//********************C# ******************
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace PPI
{
public partial class Form1 : Form
{
static libnodave.daveOSserialType fds;
static libnodave.daveInterface di;
static libnodave.daveConnection dc;
static int localPPI = 0;
static int PLCPPI = 2;
static int abc = 0;
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
fds.rfd = libnodave.setPort("COM3", "9600", 'E');
fds.wfd = fds.rfd;
if (fds.rfd > 0)
{
di = new libnodave.daveInterface(fds, "IF1", localPPI, libnodave.daveProtoPPI, libnodave.daveSpeed187k);
di.setTimeout(2000000);
// di.initAdapter();
dc = new libnodave.daveConnection(di, PLCPPI, 0, 0);
if (0 == dc.connectPLC())
{
btn_Start.Enabled = false;
btn_Stop.Enabled = true;
timer1.Enabled = true;
};
}
else
{
MessageBox.Show("串口打开错误");
}
}
private void btn_Stop_Click(object sender, EventArgs e)
{
dc.disconnectPLC();
libnodave.closePort(fds.rfd);
timer1.Enabled = false;
btn_Start.Enabled = true;
btn_Stop.Enabled = false;
}
private void timer1_Tick(object sender, EventArgs e)
{
int res = 0;
byte[] values=new byte[4];
values[0] = 0;
values[1] = 0;
values[2] = 0;
values[3] = 0;
res = dc.readBytes(libnodave.daveFlags, 0, 0, 4, values);
if (res == 0)
{
// dc.getS8().ToString()
// Form1.text = dc.getS8().ToString();
lbl_MB0.Text = values[0].ToString();
abc = abc + 1;
label5.Text = abc.ToString();
}
else
lbl_MB0.Text = res.ToString();
}
}
}