public void TestReadHoldingRegisters()
{
IModbusMessage request;
byte[] sendBytes = _modbusMaster.BuildReadHoldingRegistersCommand(slaveId, startAddress, numRegisters, out request);
_sr.Write(sendBytes, 0, sendBytes.Length);
byte[] readBuffer = new byte[1024];
int num = _sr.Read(readBuffer, 0, readBuffer.Length);
byte[] readBytes = new byte[num];
Buffer.BlockCopy(readBuffer, 0, readBytes, 0, num);
ushort[] response = _modbusMaster.GetReadHoldingRegistersResponse(readBytes, request);
}
/// <summary>
/// 每次返回请求数据命令。
/// </summary>
/// <returns></returns>
public override IList <IRequestInfo> GetConstantCommand()
{
IList <ITag> tags = this.DeviceDynamic.DynamicData.GetTags();
if (tags.Count <= 0)
{
return(null);
}
IList <IRequestInfo> requestList = new List <IRequestInfo>();
foreach (ITag tag in tags)
{
IModbusMessage requestMsg = null;
byte[] reqeustBytes = null;
if (tag.Function == Modbus.Modbus.ReadCoils)
{
#region
reqeustBytes = _modbusTcpMaster.BuildReadCoilsCommand((byte)tag.SlaveId, (ushort)tag.Address, (ushort)tag.Quantity, out requestMsg);
#endregion
}
else if (tag.Function == Modbus.Modbus.ReadInputs)
{
#region
reqeustBytes = _modbusTcpMaster.BuildReadInputsCommand((byte)tag.SlaveId, (ushort)tag.Address, (ushort)tag.Quantity, out requestMsg);
#endregion
}
else if (tag.Function == Modbus.Modbus.ReadHoldingRegisters)
{
#region
reqeustBytes = _modbusTcpMaster.BuildReadHoldingRegistersCommand((byte)tag.SlaveId, (ushort)tag.Address, (ushort)tag.Quantity, out requestMsg);
#endregion
}
else if (tag.Function == Modbus.Modbus.ReadInputRegisters)
{
#region
reqeustBytes = _modbusTcpMaster.BuildReadInputRegistersCommand((byte)tag.SlaveId, (ushort)tag.Address, (ushort)tag.Quantity, out requestMsg);
#endregion
}
if (reqeustBytes != null)
{
requestList.Add(new RequestInfo(reqeustBytes, new SendObject(requestMsg, tag)));
}
}
return(requestList);
}
