/// <summary>
/// Send a Hart Request and handle Delay Retry.
/// If no more dr retry, it sends nerwork HART device a flush Dr cmd.
/// </summary>
/// <param name="Request">byte[] a request byte array</param>
/// <param name="ByteCount">ushort request array byte count</param>
/// <param name="Timeout">int request timeout in ms</param> /// <returns><see cref="HartIPResponse"/></returns>
public HartIPResponse SendHartRequest(byte[] Request, ushort ByteCount, int Timeout = HARTIPConnect.USE_SOCKET_TIMEOUT_DEFAULT)
{
HartIPRequest Req = HartIPRequest.HartCommandRequest(m_HartIPConn.TransactionId, Request, ByteCount, Timeout);
return(SendHartRequest(Req));
}
/// <summary>
/// Build a Hart-IP request
/// </summary>
/// <param name="Command">byte[] request Command byte array
/// <para>Array should include the frame, device address, command, byte count,
/// data, and checksum bytes.</para>para</param>
/// <param name="usByteCount">ushort the specified Command array byte count</param>
/// <returns><see cref="HartIPRequest"/></returns>
public HartIPRequest BuildHartRequest(byte[] Command, ushort usByteCount)
{
return(HartIPRequest.HartCommandRequest(TransactionId, Command, usByteCount));
}
/// <summary>
/// Build a HartIP Request using the specified request command, request message,
/// device type, and device id. It will have frame, device address, command, byte count,
/// data, and checksum bytes in the returned HartIPRequest.Command.
/// </summary>
/// <param name="usReqCmd">ushort Request command</param>
/// <param name="ReqMsg">String Request message in Hex string</param>
/// <param name="usDeviceType">ushort Device Type</param>
/// <param name="nDeviceId">uint Device ID</param>
/// <returns><see cref="HartIPRequest"/></returns>
public HartIPRequest BuildHartIPRequest(ushort usReqCmd, String ReqMsg, ushort usDeviceType,
uint nDeviceId)
{
String Msg;
HartIPRequest HRequest = null;
int nDataLen = 0;
if (m_HartIPConn == null)
{
throw new Exception("Call Connect to initialize the network connection first.");
}
if ((uint)(usReqCmd) > 65536)
{
Msg = "Invalid HARTIP Request Command.";
throw new ArgumentException(Msg);
}
if (!String.IsNullOrEmpty(ReqMsg))
{
ReqMsg = ReqMsg.Replace(" ", "");
nDataLen = ReqMsg.Length;
if ((nDataLen > 0) && (nDataLen % 2) != 0)
{
Msg = "Multiple contiguous bytes must define an even number of hex digits.";
throw new ArgumentException(Msg);
}
}
// Check if it is extended command
bool bExtendedCmd = (usReqCmd > HARTIPMessage.MAX_SINGLE_BYTE_CMD) ? true : false;
byte cCmd = (byte)(bExtendedCmd ? HARTIPMessage.CMD_EXTENDED_CMD : usReqCmd);
byte cbyteCount = 9;
byte cDataByteCount = 0;
int nIndex = 0;
int nSubCmdByteCountIndex;
// Request bytes
byte[] Data = new byte[HARTIPMessage.MAX_REQUEST_MSG_LEN];
Array.Clear(Data, 0, Data.Length);
if (nDataLen > 0)
{
cbyteCount += (byte)(nDataLen / 2);
cDataByteCount = (byte)(nDataLen / 2);
}
// form a request
Data[nIndex++] = 0x82; // long frame
Data[nIndex++] = (byte)(((usDeviceType >> 8) & 0x3F) | 0x80);
Data[nIndex++] = (byte)(usDeviceType & 0x0ff);
Data[nIndex++] = (byte)((nDeviceId >> 16) & 0x0ff);
Data[nIndex++] = (byte)((nDeviceId >> 8) & 0x0ff);
Data[nIndex++] = (byte)(nDeviceId & 0x0ff);
Data[nIndex++] = cCmd; // cmd
nSubCmdByteCountIndex = nIndex;
// skip the byte count
nIndex += 1;
// if it is extended cmd, put the cmd two bytes in data field first
if (bExtendedCmd)
{
Data[nIndex++] = (byte)((usReqCmd >> 8) & 0x0ff);
Data[nIndex++] = (byte)(usReqCmd & 0x0ff);
cbyteCount += 2;
cDataByteCount += 2;
}
// set the data byte count value
Data[nSubCmdByteCountIndex] = cDataByteCount;
int n = 0;
byte cY, cW;
while (n < nDataLen)
{
if (HartUtil.HexCharToNibble(ReqMsg[n], out cY))
{
if (HartUtil.HexCharToNibble(ReqMsg[n + 1], out cW))
{
Data[nIndex++] = (byte)(cY * 16 + cW);
n += 2;
}
else
{
Msg = String.Format("The character: '{0}' is not allowed in the request data byte value.",
ReqMsg[n + 1]);
throw new ArgumentException(Msg);
}
}
else
{
Msg = String.Format("The character: '{0}' is not allowed in the request data byte value.",
ReqMsg[n]);
throw new ArgumentException(Msg);
}
}
// tunnel messages to attached devices
if (RootDevice.DeviceType != usDeviceType && RootDevice.DeviceId != nDeviceId && RootDevice.IsBridgeDevice)
{ // message is routed into an attached device
// wrap the message with command 77 to tunnel to attached device
byte[] Data77 = new byte[HARTIPMessage.MAX_REQUEST_MSG_LEN];
Array.Clear(Data77, 0, Data.Length);
// command 77 request data
HartDevice dev = FindDevice(nDeviceId);
Data77[0] = dev.IOCard;
Data77[1] = dev.Channel;
Data77[2] = 5; // transmit preamble count
Array.Copy(Data, 0, Data77, 3, nIndex);
nIndex += 3;
// send the command 77 to the root device (a gateway or IO)
string hex = BitConverter.ToString(Data77).Replace("-", string.Empty);
hex = hex.Substring(0, nIndex * 2);
return(BuildHartIPRequest(77, hex, RootDevice.DeviceType, RootDevice.DeviceId));
}
// Get check sum byte and send the request
Data[nIndex] = HartUtil.GetCheckSum(Data, (byte)(cbyteCount - 1));
HRequest = HartIPRequest.HartCommandRequest(m_HartIPConn.TransactionId,
Data, cbyteCount);
return(HRequest);
}
