Calling all programmers - help!

[edmundp]

Hi All,

 

Need some advice as I am stumped/stupid. I am trying to fiddle around in C# to call the inverter with certain commands. I got the basics going and get the NAK response. (Been a LONG time since I programmed so snails pace.)

 

The problems are as follows:

 

1. Could someone please help me with the fixed CRC codes to send for the following commands - I know they are calculated but after that remains the same:
   • POP00 = Run off Utility
   • POP02 = Run off Batteries
   • QPIGS
   • QPIRI
2. How on earth do I send these CRC values to the serial port in C# - I have tried serialport.write (send string & hex byte, serialport.writeline (send string as hex translated to char) etc.

I get the NAK response if using serialport.writeline("QPIGS") - that obviously should not work, but that proves the port is open and readable.

 

Please?

[scottwday]

Here are the commands in hex:

POP00: 50 4f 50 30 30 c2 48 0d
POP02: 50 4f 50 30 32 e2 0b 0d
QPIGS: 51 50 49 47 53 b7 a9 0d
QPIRI: 51 50 49 52 49 f8 54 0d

 

This example program works with my inverter: https://github.com/scottwday/AxpertTest/blob/master/Program.cs

[___]

On a unix machine, "man ascii" is your friend :-)

[Warren]

//TO SENDSerialPort sp = new SerialPort(); sp.PortName = "COM3";            sp.BaudRate = 2400;            sp.DataBits = 8;            sp.Parity = Parity.None;            sp.StopBits = StopBits.One;            sp.Open();            sp.DataReceived += new SerialDataReceivedEventHandler(DataReceivedHandler);            sp.ErrorReceived += new SerialErrorReceivedEventHandler(DataErrorReceivedHandler);            ProtocolCommand.command = "QPI";            byte[] tx = ProtocolCommand.GetBytes(Encoding.ASCII.GetString(ProtocolCommand.QPI),                        CRC16.Calculate(Encoding.UTF8.GetBytes(Encoding.ASCII.GetString(ProtocolCommand.QPI))));            sp.Write(tx, 0, tx.Length);//RECIEVE RESPONSESpublic void DataReceivedHandler(object sender, SerialDataReceivedEventArgs e)        {            var sp = sender as SerialPort;            MemoryStream _rxBuffer = new MemoryStream();            bool _gotResponse = false;            if ((sp != null) && (!_gotResponse))            {                while (sp.BytesToRead > 0)                {                    byte b = (byte)sp.ReadByte();                    _rxBuffer.WriteByte(;                    if (b == 0x0d)                    {                        _gotResponse = true;                        break;                    }                }            }            _gotResponse = false;            _rxBuffer.Position = 0;            SetText(Encoding.ASCII.GetString(_rxBuffer.ToArray()));            Datalogger.insertRecord(ProtocolCommand.command, Encoding.ASCII.GetString(_rxBuffer.ToArray()));            _rxBuffer.Dispose();        }

Hope this helps

[edmundp]

Thanks all. Got it working. Now to parse the data.