public static string Make(FxCommandConst cmd, FxAddress addr, int length, string data)
{
Debug.Assert(length == data.Length, "length(长度)必须与给定的数据实际一致");
StringBuilder sb = new StringBuilder(64 + data.Length);
sb.Append((char)FxControlCode._STX);
sb.Append((char)cmd);
sb.Append(addr.ToAddressHexString());
sb.Append(FxConvert.DecToHex((uint)(length / 2), 2));
sb.Append(data);
sb.Append((char)FxControlCode._ETX);
sb.Append(FxConvert.DecToHex(GetCheckSum(sb.ToString(), 1), 2));
return(sb.ToString());
}
/// <summary>
/// 构建PLC FX命令
/// 支持各种“读数据”或“查询”类命令，支持多种数据类型，例如 UInt16DataType,UIntDataType
/// </summary>
/// <param name="response">命令字</param>
/// <param name="addr">起始地址</param>
/// <param name="length">数据长度，以字节为单位。例如：如果是16bits则为2、32bits则为4</param>
/// <returns>返回构造完成的命令串</returns>
public static string Make(FxCommandConst cmd, FxAddress addr, int length)
{
StringBuilder sb = new StringBuilder(64);
sb.Append((char)FxControlCode._STX);
sb.Append((char)cmd);
sb.Append(addr.ToAddressHexString());
if (length > 0)
{
sb.Append(FxConvert.DecToHex((uint)length, 2));
}
sb.Append((char)FxControlCode._ETX);
sb.Append(FxConvert.DecToHex(GetCheckSum(sb.ToString(), 1), 2));
return(sb.ToString());
}