internal static bool[] ExtractValues(ReadHoldingCoilsRequest request, RTUResponse response)
{
if (response.Data.Length < 1)
{
throw new RTUException("The Response Data Length was too short to extract the Byte Count");
}
int expectedByteCount = request.Length > 0 ? request.Length / 8 : 0;
if (request.Length % 8 != 0)
{
expectedByteCount += 1;
}
if (response.Data[0] != expectedByteCount)
{
throw new RTUException("The Response Byte Count '" + response.Data[0].ToString() + "' did not match the Expected Byte Count '" + expectedByteCount.ToString() + "'");
}
if (response.Data.Length < expectedByteCount + 1)
{
throw new RTUException("The Response Data Length of '" + response.Data.Length.ToString() + "' was too short - Expecting a Length of '" + (expectedByteCount + 1).ToString() + "'");
}
if (request.Length == 0)
{
return(new bool[0]);
}
BitArray bitArray = new BitArray(response.Data.Skip(1).ToArray());
bool[] values = new bool[request.Length];
for (int i = 0; i < values.Length; i++)
{
values[i] = bitArray.Get(i);
}
return(values);
}
public async Task <ReadCoilsResult> ReadHoldingCoilsAsync(ushort startAddress, ushort length, CancellationToken cancellationToken)
{
lock (_isInitializedLock)
{
if (_isInitialized == false)
{
throw new ModbusException("This Modbus RTU Device must be Initialized first before any Requests can be Processed");
}
}
if (startAddress > MaximumAddress)
{
throw new ArgumentOutOfRangeException(nameof(startAddress), "The Start Address is greater than the Maximum Allowed Value of '" + MaximumAddress + "'");
}
if (length == 0)
{
throw new ArgumentOutOfRangeException(nameof(length), "The Length cannot be Zero");
}
if (length > MaximumCoilsReadLength)
{
throw new ArgumentOutOfRangeException(nameof(length), "The Length is greater than the Maximum Allowed Value of '" + MaximumCoilsReadLength + "'");
}
ReadHoldingCoilsRequest request = ReadHoldingCoilsRequest.CreateNew(this, startAddress, length);
ProcessRequestResult requestResult = await _channel.ProcessRequestAsync(request, _timeout, _retries, _delayBetweenMessages, cancellationToken);
return(new ReadCoilsResult
{
BytesSent = requestResult.BytesSent,
PacketsSent = requestResult.PacketsSent,
BytesReceived = requestResult.BytesReceived,
PacketsReceived = requestResult.PacketsReceived,
Duration = requestResult.Duration,
Values = ReadHoldingCoilsResponse.ExtractValues(request, requestResult.Response),
});
}
