/// <summary>
/// This method is used to send a command to the embedded PTU target using the type of
/// device specified in the argument. The difference between this method and the 3 parameter
/// method of the same name is that this method is used when there is no payload with the command.
/// </summary>
/// <param name="commDevice">The comm device used to communicate with target</param>
/// <param name="packetRequestType">The command sent to the target</param>
/// <returns>CommunicationError.Success (0) if all is well; otherwise another enumeration which is less than 0</returns>
public CommunicationError SendCommandToEmbedded(ICommDevice commDevice, ProtocolPTU.PacketType packetRequestType)
{
// Send the SOM and receive it
CommunicationError commError = (CommunicationError)commDevice.SendReceiveSOM();
// Verify the sending and receiving of SOM is /RX OK
if (commError != CommunicationError.Success)
{
return commError;
}
// Create the message header for a command and command type; "null" as 1st argument indicates no payload
ProtocolPTU.DataPacketProlog dpp = new ProtocolPTU.DataPacketProlog();
Byte[] txMessage = dpp.GetByteArray(null, packetRequestType, ProtocolPTU.ResponseType.COMMANDRESPONSE, commDevice.IsTargetBigEndian());
// Send the command to the target
Int32 errorCode = commDevice.SendMessageToTarget(txMessage);
// Verify the command was sent without errors
if (errorCode < 0)
{
return CommunicationError.BadRequest;
}
// Since no return data is expected, verify the embedded target responds with an Acknowledge (implicit
// acknowledge with TCP, but 232 has no such entity
errorCode = commDevice.ReceiveTargetAcknowledge();
if (errorCode < 0)
{
return CommunicationError.BadResponse;
}
return CommunicationError.Success;
}
/// <summary>
/// This method is used to send a data request to the embedded PTU target using the type of
/// device specified in the argument. The difference between this method and the method of the same name
/// is that this method is used when there is NO payload with the data request.
/// </summary>
/// <param name="commDevice">The comm device used to communicate with target</param>
/// <param name="packetRequestType">The command sent to the target</param>
/// <param name="rxMessage">Used to store the response from the embedded target</param>
/// <returns>CommunicationError.Success (0) if all is well; otherwise another enumeration which is less than 0</returns>
public CommunicationError SendDataRequestToEmbedded(ICommDevice commDevice, ProtocolPTU.PacketType packetRequestType, Byte[] rxMessage)
{
// Send the SOM and receive it
CommunicationError commError = (CommunicationError)commDevice.SendReceiveSOM();
// Verify the sending and receiving of SOM is /RX OK
if (commError != CommunicationError.Success)
{
return commError;
}
// Create the message header for a command and command type; "null" as 1st argument indicates no payload
ProtocolPTU.DataPacketProlog dpp = new ProtocolPTU.DataPacketProlog();
Byte[] txMessage = dpp.GetByteArray(null, packetRequestType, ProtocolPTU.ResponseType.DATARESPONSE, commDevice.IsTargetBigEndian());
// Send the command to the target
Int32 errorCode = commDevice.SendMessageToTarget(txMessage);
if (errorCode < 0)
{
return CommunicationError.BadRequest;
}
// Verify the target responds with data
errorCode = commDevice.ReceiveTargetDataPacket(rxMessage);
if (errorCode < 0)
{
return CommunicationError.BadResponse;
}
return CommunicationError.Success;
}