using System; 
using System.Windows.Forms; 
Using Modbus. Device; 
Using System. IO. Ports; 
Using MySql. Data. MySqlClient; 

The namespace Modbus72 
{
Public partial class MainForm: Form 
{
Private static IModbusMaster master; 
Private static SerialPort port; 
//write coil or register array 
Private bool [] coilsBuffer; 
Private ushort [] registerBuffer; 
//parameter (station number respectively, and the start address and length) 
Private byte slaveAddress; 
Private ushort startAddress; 
Private ushort startAddress1; 
Private ushort numberOfPoints; 
Private ushort numberOfPoints1; 
//serial port parameters calibration data baud rate of serial port a stop bit 
Private string portName; 
Private int baudRate; 
Private Parity Parity; 
Private int dataBits; 
Private StopBits StopBits; 
Public MainForm () 
{
InitializeComponent(); 
} 

Private void MainForm_Load (object sender, EventArgs e) 
{
Timer1. Interval=3000; 
Btnstart. Enabled=true; 
Btnstop. Enabled=false; 
} 
Private SerialPort InitSerialPortParameter () 
{
If (cbxcom SelectedIndex & lt; 0) 
{
MessageBox. Show (" please select serial number "); 
return null; 
} 
The else 
{
PortName=cbxcom. SelectedItem. ToString (); 
BaudRate=19200; 
Parity=parity. Even; 
DataBits=8; 
StopBits=stopBits. One; 
Port=new SerialPort (portName baudRate, parity, dataBits, stopBits); 
Return to the port. 
} 
} 

Private void btnread_Click (object sender, EventArgs e) 
{
Try 
{
//initialize serial port parameters 
InitSerialPortParameter (); 
Master=ModbusSerialMaster. CreateRtu (port); 
ExecuteFunction (); 
} 
The catch (Exception) 
{
MessageBox. Show (" initialization exception "); 
} 
} 
Private void ExecuteFunction () 
{
SlaveAddress=byte. Parse (" 1 "); 
String today=DateTime. Now. ToString (" MM - dd yyyy - HH: MM: ss "); 
String connetStr="server=10.10.20.5; Port=3309; User=root; Password=rootqsr; The database=db_qualitymanager; "; 
MySqlConnection conn=new MySqlConnection (connetStr); 
Try 
{
//each operation is to open the serial port operation need to be closed after the completion of a serial port 
//in order to change slave connection is not an error 
If (port. IsOpen==false) 
{
Port. The Open (); 
} 
StartAddress=ushort. Parse (" 0 "); 
NumberOfPoints=ushort. Parse (" 20 "); 
//read the coil 
CoilsBuffer=master. ReadCoils (slaveAddress startAddress, numberOfPoints); 
for (int i=0; I & lt; CoilsBuffer. Length; I++) 
{
Bool m=coilsBuffer [I];//coil state 
If (m==true) 
{
//read the register 
Int j=I * 4 + 6; 
StartAddress1=ushort. Parse (j + ""); 
NumberOfPoints1=ushort. Parse (" 3 "); 
RegisterBuffer=master. ReadHoldingRegisters (slaveAddress startAddress1, numberOfPoints1); 
String x=registerBuffer [0] + ""; 
String y=registerBuffer [2] + ""; 
If (x=="0") 
{
continue; 
} 
The else 
{
If (I & lt; 10) 
{
# region 
String DPR="z_0" + I; 
Conn. The Open (); 
String SQL=the string. Format (" insert into "+ DPR +" (vultime opetime, prdate) values (' {0} ', '{1}' and '{2}) ", x, y, today). 
MySqlCommand CMD=new MySqlCommand (SQL, conn); 
CMD. ExecuteNonQuery (); 
Conn. Close (); 

//modify register 
String s=j + ""; 
StartAddress=ushort. Parse (s); 
String [] strarr={" 0 "}; 
RegisterBuffer [0]=ushort. Parse (strarr [0]). 
Master. WriteSingleRegisterAsync (slaveAddress startAddress, registerBuffer [0]). 
# endregion 
} 
The else 
{
# region 
String DPR="z_" + I; 
Conn. The Open (); 
String SQL=the string. Format (" insert into "+ DPR +" (vultime opetime, prdate) values (' {0} ', '{1}' and '{2}) ", x, y, today). 
MySqlCommand CMD=new MySqlCommand (SQL, conn); 
CMD. ExecuteNonQuery (); 
Conn. Close (); 

//modify register 
String s=j + ""; 
StartAddress=ushort. Parse (s); 
String [] strarr={" 0 "}; 
RegisterBuffer [0]=ushort. Parse (strarr [0]). 
Master. WriteSingleRegisterAsync (slaveAddress startAddress, registerBuffer [0]). 
# endregion 
} 
} 
} 
//SetMsg (coilsBuffer [I] + ""); 
} 
//SetMsg (" \ r \ n "); 
Port. The Close (); 
} 
The catch (Exception ex) 
{
MessageBox. Show (ex. Message); 
} 
} 

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