实例介绍
【实例截图】
【核心代码】 /// <summary>
/// 03 READ HOLDING REGISTER Short 读保持寄存器
/// </summary>
/// <param name="slaveID"></param>
/// <param name="startAddress"></param>
/// <param name="length"></param>
/// <returns></returns>
private List<short> ReadShortHoldingRegisters(int slaveID, int startAddress, int length)
{
lock (readshort)
{
startAddress = startAddress - 1;
List<short> shorts = null;
var remainLength = 0;
if (length > 120)
{
remainLength = length - 120;
length = 120;
}
try
{
var factory = new ModbusFactory();
if (currentNodeLeft.IsSerial)
{
using (SerialPort port = new SerialPort(currentNodeLeft.SerialNo))
{
// configure serial port
port.BaudRate = currentNodeLeft.BaudRate;
port.DataBits = 8;
port.Parity = Parity.None;
port.StopBits = StopBits.One;
port.ReadTimeout = Convert.ToInt32(readtimeout);
port.WriteTimeout = Convert.ToInt32(readtimeout);
port.Open();
// create modbus master
if (currentNodeLeft.Mode == "RTU")
{
master = factory.CreateRtuMaster(port);
}
else
{
master = factory.CreateAsciiMaster(port);
}
ModbusMasterEnhanced modbusMasterExt = new ModbusMasterEnhanced(master);
shorts = modbusMasterExt.ReadShortHoldingRegisters((byte)slaveID, (ushort)startAddress, (ushort)length).ToList();
if (shorts == null || shorts.Count() <= 0)
{
shorts = new List<short>();
for (ushort i = 0; i < length; i = 1)
{
var code3single = modbusMasterExt.ReadShortHoldingRegisters((byte)slaveID, (ushort)(startAddress i), 1);
shorts.AddRange(code3single);
}
}
}
}
else
{
using (TcpClient client = new TcpClient(currentNodeLeft.IP, currentNodeLeft.COM))
{
client.ReceiveTimeout = 500000;
master = factory.CreateMaster(client);
ModbusMasterEnhanced modbusMasterExt = new ModbusMasterEnhanced(master);
shorts = modbusMasterExt.ReadShortHoldingRegisters((byte)slaveID, (ushort)startAddress, (ushort)length).ToList();
//var ttt= master.ReadHoldingRegisters((byte)slaveID, (ushort)startAddress, (ushort)length).ToList();
if (shorts == null || shorts.Count() <= 0)
{
shorts = new List<short>();
for (ushort i = 0; i < length; i = 1)
{
var code3single = modbusMasterExt.ReadShortHoldingRegisters((byte)slaveID, (ushort)(startAddress i), 1);
shorts.AddRange(code3single);
}
}
}
}
if (remainLength > 0)
{
shorts.AddRange(ReadShortHoldingRegisters(slaveID, startAddress 120, remainLength));
}
return shorts;
}
catch (Exception er)
{
// MessageBox.Show("Modbus Slave 异常，读取失败:" er.Message);
ExceptionExportLog.ExceptionWriteLog("write", string.Format("message:{0},StackTrace:{1},para:{2},slaveID:{3},startAddress:{4},length:{5}", er.Message, er.StackTrace, JsonConvert.SerializeObject(currentNodeLeft), slaveID, startAddress, length));
return new List<short>();
}
}
}
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