//根据modbus响应的对象转成字节数组
public static byte[] ToBytes(ModbusRTUResponse request)
{
return(new byte[0]);
}
//根据字节数组转成modbus响应上来的对象
public static ModbusRTUResponse FromBytes(byte[] bytes, out string errMsg)
{
errMsg = "";
try
{
switch (bytes[1])
{
case 0x03:
{
if (bytes.Length != 7)
{
return(null);
}
//读寄存器回应
ModbusRTUResponse response = new ModbusRTUResponse();
response.PlcAddress = bytes[0];
response.Type = ResponseType.Read;
// 含义：寄存器的个数*2
response.DataLength = bytes[2];
response.Values = ByteUtil.ToUshorts(bytes, 3, response.DataLength);
response.CRC = BitConverter.ToUInt16(bytes, 5); // CRC 无需反转高低位
if (response.DataLength == 0x02)
{
// 针对单个寄存器
response.RegisterValue = response.Values[0];
response.RegisterCount = 0x01;
}
return(response);
}
case 0x10:
{
if (bytes.Length != 8)
{
return(null);
}
// 目前只有单个寄存器写入
ModbusRTUResponse response = new ModbusRTUResponse();
response.PlcAddress = bytes[0];
response.Type = ResponseType.Write;
response.RegisterBeginAddress = ByteUtil.ToUshort(bytes, 2);
response.RegisterValue = ByteUtil.ToUshort(bytes, 4);
response.CRC = BitConverter.ToUInt16(bytes, 6); // CRC 无需反转高低位
return(response);
}
case 0x83:
{
if (bytes.Length != 5)
{
return(null);
}
// 读单个寄存器请求出错
ModbusRTUResponse response = new ModbusRTUResponse();
response.PlcAddress = bytes[0];
response.Type = ResponseType.ReadError;
response.errMsg = "读寄存器请求出错--" + GetErrMSg(bytes[2]);
response.CRC = BitConverter.ToUInt16(bytes, 3); // CRC 无需反转高低位
return(response);
}
case 0x86:
{
if (bytes.Length != 5)
{
return(null);
}
// 写单个寄存器请求出错
ModbusRTUResponse response = new ModbusRTUResponse();
response.PlcAddress = bytes[0];
response.Type = ResponseType.WriteError;
response.errMsg = "写寄存器请求出错--" + GetErrMSg(bytes[2]);
response.CRC = BitConverter.ToUInt16(bytes, 3); // CRC 无需反转高低位
return(response);
}
}
}
catch (Exception e)
{
errMsg = e.Message;
return(null);
}
errMsg = "字节数组转modbus回应对象出现未知的功能码";
return(null);
}
