/// <summary>解析消息</summary>
/// <param name="pk"></param>
/// <returns></returns>
public static ModbusMessage Read(Packet pk, Boolean reply = false)
{
var msg = new ModbusMessage {
Reply = reply
};
if (msg.Read(pk.GetStream(), null))
{
return(msg);
}
return(null);
}
public ModbusMessage CreateReply()
{
if (Reply)
{
throw new InvalidOperationException();
}
var msg = new ModbusMessage
{
Reply = true,
TransactionId = TransactionId,
ProtocolId = ProtocolId,
Host = Host,
Code = Code,
};
return(msg);
}
/// <summary>发送两字节命令，并接收返回</summary>
/// <param name="host"></param>
/// <param name="code"></param>
/// <param name="address"></param>
/// <param name="value"></param>
/// <returns></returns>
public override Byte[] SendCommand(Byte host, FunctionCodes code, UInt16 address, Object value)
{
Open();
var tid = Interlocked.Increment(ref _transactionId);
var msg = new ModbusMessage
{
TransactionId = (UInt16)tid,
ProtocolId = ProtocolId,
Host = host,
Code = code,
Address = address,
//Count = value
};
if (value is UInt16 v)
{
msg.Count = v;
}
else if (value is Packet pk)
{
msg.Payload = pk;
}
else if (value is Byte[] buf)
{
msg.Payload = buf;
}
WriteLog("=> {0}", msg);
var cmd = msg.ToPacket().ToArray();
{
using var span = Tracer?.NewSpan("modbus:SendCommand", cmd.ToHex());
_stream.Write(cmd, 0, cmd.Length);
Thread.Sleep(10);
}
using var span2 = Tracer?.NewSpan("modbus:ReceiveCommand");
try
{
var buf = new Byte[BufferSize];
var c = _stream.Read(buf, 0, buf.Length);
buf = buf.ReadBytes(0, c);
if (span2 != null)
{
span2.Tag = buf.ToHex();
}
var rs = ModbusMessage.Read(buf, true);
if (rs == null)
{
return(null);
}
WriteLog("<= {0}", rs);
return(rs.Payload?.ToArray());
}
catch (Exception ex)
{
span2?.SetError(ex, null);
if (ex is TimeoutException)
{
return(null);
}
throw;
}
}
