nmodbus C#modbus库

Provides connectivity to Modbus slave compatible devices and applications. Supports serial ASCII, serial RTU, serial over USB ASCII, serial over USB RTU, TCP, and UDP protocols.

开源的modbus库，使用C#开发。

网址http://code.google.com/p/nmodbus/

modbus-rtu读取holding寄存器值，代码如下：

SerialPort port = new SerialPort();
            //配置串口
            port.PortName = com;
            port.BaudRate = 9600;
            port.DataBits = 8;
            port.Parity = Parity.None;
            port.StopBits = StopBits.One;
            port.ReadTimeout = 500;
            port.WriteTimeout = 500;
            port.Open();


            // create modbus-rtu master
            master = ModbusSerialMaster.CreateRtu(port);
int slave_id = 1;
int reg_addr = 10;


            //读取多个holding寄存器
ushort[] vals = master.ReadHoldingRegisters(slave_id, reg_addr, 2);
            if (vals == null)
            {

}
else
{
}

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