/// <summary>
/// Send short frame command 0 to discover the HART Device that is
/// connected to the network.
/// </summary>
/// <returns><see cref="HartDevice"/></returns>
private HartDevice DiscoverHartDevice(byte polladdr)
{
HartIPResponse Rsp = null;
byte[] Params = new byte[5];
HartDevice Dev = null;
// short frame
Params[0] = 0x02;
// Device's polling address in short frame
Params[1] = (byte)((polladdr & 0x3F) | 0x80);
// cmd 0
Params[2] = HARTIPMessage.CMD_READ_UID;
// byte count is zero
Params[3] = 0x00;
// get check sum byte
Params[4] = HartUtil.GetCheckSum(Params, 4);
Rsp = SendHartRequest(Params, 5, HARTIPConnect.IO_SOCKET_TIMEOUT);
if (Rsp != null)
{
try
{
Dev = HartUtil.CreateHartDevice(Rsp, null);
}
catch (Exception e)
{
m_Error = "DiscoverHartDevice Exception: " + e.Message;
Logger.Log(m_Error, true);
}
}
return(Dev);
}
/// <summary>
/// Send a Hart Request
/// </summary>
/// <param name="usDeviveType">ushort</param>
/// <param name="nDeviceId">uint</param>
/// <param name="cCmd">byte</param>
/// <returns><see cref="HartIPResponse"/></returns>
/// <remarks>It will create long frame, device type, device id,
/// cmd and checksum bytes array for the request command.</remarks>
private HartIPResponse SendHartRequest(ushort usDeviveType, uint nDeviceId,
byte cCmd)
{
byte[] Params = new byte[9];
// Create request cmd
Params[0] = 0x82; // long frame
Params[1] = (byte)(((usDeviveType >> 8) & 0x3F) | 0x80);
Params[2] = (byte)(usDeviveType & 0x0ff);
Params[3] = (byte)((nDeviceId >> 16) & 0x0ff);
Params[4] = (byte)((nDeviceId >> 8) & 0x0ff);
Params[5] = (byte)(nDeviceId & 0x0ff);
Params[6] = cCmd; // cmd byte
Params[7] = 0x00; // byte count
Params[8] = HartUtil.GetCheckSum(Params, 8); // get check sum byte
return(SendHartRequest(Params, 9));
}
/// <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);
}
/// <summary>
/// Send HART device a command 84.
/// </summary>
/// <param name="Dev"><see cref="HartDevice"/></param>
/// <param name="usDeviceIndex">ushort</param>
/// <returns><see cref="HartDevice"/></returns>
private HartDevice SendCmd84(HartDevice Dev, ushort usDeviceIndex)
{
HartDevice HDevice = null;
ushort usDeviceType;
uint nDeviceId;
byte[] Req = new byte[11];
HartIPResponse Rsp = null;
if (Dev != null)
{
usDeviceType = Dev.DeviceType;
nDeviceId = Dev.DeviceId;
// send cmd to HART Device get the device list
Req[0] = 0x82; // long frame
Req[1] = (byte)(((usDeviceType >> 8) & 0x3F) | 0x80);
Req[2] = (byte)(usDeviceType & 0x0ff);
Req[3] = (byte)((nDeviceId >> 16) & 0x0ff);
Req[4] = (byte)((nDeviceId >> 8) & 0x0ff);
Req[5] = (byte)(nDeviceId & 0x0ff);
Req[6] = HARTIPMessage.CMD_READ_SUB_DEVICE_IDENTITY; // cmd byte
Req[7] = 2; // byte count
Req[8] = (byte)((usDeviceIndex >> 8) & 0x0ff);
Req[9] = (byte)(usDeviceIndex & 0x0ff);
Req[10] = HartUtil.GetCheckSum(Req, 10); // get check sum byte
Rsp = SendHartRequest(Req, 11);
if (Rsp != null)
{
byte cDataCount = Rsp.DataCount;
if ((Rsp.ResponseCode != HARTIPMessage.RSP_SUCCESS) &&
(Rsp.Command != HARTIPMessage.CMD_READ_SUB_DEVICE_IDENTITY) ||
(cDataCount < 44))
{
m_Error = String.Format("{0} Received Cmd 84 invalid response from HART device.\r\n{1}",
HartUtil.GetTimeStamp(), Rsp.ToString());
Logger.Log(m_Error);
}
else
{
byte cIOCard, cChannel, cUniversalCmdRev;
byte[] Data = new byte[cDataCount];
Data = Rsp.Data;
int nIndex = 2;
ushort usSubDeviceType;
uint nSubDeviceId;
String Tag = String.Empty;
cIOCard = Data[nIndex++];
cChannel = Data[nIndex++];
// skip the MfgId (2 bytes)
nIndex += 2;
// get the device type
usSubDeviceType = (ushort)((Data[nIndex] << 8) + (Data[nIndex + 1] & 0x0ff));
nIndex += 2;
// get the device id
nSubDeviceId = (uint)((Data[nIndex] << 16) + (Data[nIndex + 1] << 8) +
(Data[nIndex + 2] & 0x0ff));
nIndex += 3;
// get the universal cmd rev
cUniversalCmdRev = Data[nIndex++];
// get the tag
for (int i = nIndex; i < (nIndex + HARTIPMessage.MAX_LONG_TAG_LENGTH); i++)
{
char ch = (char)(Data[i] & 0x00ff);
if (ch == 0)
{
break;
}
Tag += ch;
}
Tag = Tag.TrimEnd();
// if tag is empty, set it to 'Unknown' with its device type and device id similar to MAC address
if (Tag.Length == 0)
{
String strOUI = (cUniversalCmdRev >= 7) ? "00-1B-1E" : "00-00-00";
Tag = String.Format("Unknown ({0}-{1:X2}-{2:X2}-{3:X2}-{4:X2}-{5:X2})",
new object[] { strOUI,
(usSubDeviceType >> 8),
(usSubDeviceType & 0x0ff),
(nSubDeviceId >> 16 & 0x0ff),
(nSubDeviceId >> 8 & 0x0ff),
(nSubDeviceId & 0x0ff) });
}
// Create sub-device
HDevice = new HartDevice(usSubDeviceType, nSubDeviceId, cUniversalCmdRev, Dev);
HDevice.Name = Tag;
HDevice.IOCard = cIOCard;
HDevice.Channel = cChannel;
}
}
}
return(HDevice);
}
