/// <summary>
/// Инициализировать ADU запроса и рассчитать длину ответа
/// </summary>
public virtual void InitReqADU(byte devAddr, TransModes transMode)
{
if (ReqPDU != null)
{
int pduLen = ReqPDU.Length;
switch (transMode)
{
case TransModes.RTU:
ReqADU = new byte[pduLen + 3];
ReqADU[0] = devAddr;
ReqPDU.CopyTo(ReqADU, 1);
ushort crc = ModbusUtils.CalcCRC16(ReqADU, 0, pduLen + 1);
ReqADU[pduLen + 1] = (byte)(crc % 256);
ReqADU[pduLen + 2] = (byte)(crc / 256);
RespAduLen = RespPduLen + 3;
break;
case TransModes.ASCII:
byte[] aduBuf = new byte[pduLen + 2];
aduBuf[0] = devAddr;
ReqPDU.CopyTo(aduBuf, 1);
aduBuf[pduLen + 1] = ModbusUtils.CalcLRC(aduBuf, 0, pduLen + 1);
StringBuilder sbADU = new StringBuilder();
foreach (byte b in aduBuf)
{
sbADU.Append(b.ToString("X2"));
}
ReqADU = Encoding.Default.GetBytes(sbADU.ToString());
ReqStr = ModbusUtils.Colon + sbADU;
RespAduLen = RespPduLen + 2;
break;
default: // TransModes.TCP
ReqADU = new byte[pduLen + 7];
ReqADU[0] = 0;
ReqADU[1] = 0;
ReqADU[2] = 0;
ReqADU[3] = 0;
ReqADU[4] = (byte)((pduLen + 1) / 256);
ReqADU[5] = (byte)((pduLen + 1) % 256);
ReqADU[6] = devAddr;
ReqPDU.CopyTo(ReqADU, 7);
RespAduLen = RespPduLen + 7;
break;
}
}
}
/// <summary>
/// Выполнить запрос в режиме ASCII
/// </summary>
public bool AsciiRequest(DataUnit dataUnit)
{
if (!CheckConnection())
{
return(false);
}
bool result = false;
// отправка запроса
ExecWriteToLog(dataUnit.ReqDescr);
Connection.WriteLine(dataUnit.ReqStr, out string logText);
ExecWriteToLog(logText);
// приём ответа
string line = Connection.ReadLine(Timeout, out logText);
ExecWriteToLog(logText);
int lineLen = line == null ? 0 : line.Length;
if (lineLen >= 3)
{
int aduLen = (lineLen - 1) / 2;
if (aduLen == dataUnit.RespAduLen && lineLen % 2 == 1)
{
// получение ADU ответа
byte[] aduBuf = new byte[aduLen];
bool parseOK = true;
for (int i = 0, j = 1; i < aduLen && parseOK; i++, j += 2)
{
try
{
aduBuf[i] = byte.Parse(line.Substring(j, 2), NumberStyles.HexNumber);
}
catch
{
ExecWriteToLog(ModbusPhrases.IncorrectSymbol);
parseOK = false;
}
}
if (parseOK)
{
if (aduBuf[aduLen - 1] == ModbusUtils.CalcLRC(aduBuf, 0, aduLen - 1))
{
// расшифровка ответа
string errMsg;
if (dataUnit.DecodeRespPDU(aduBuf, 1, aduLen - 2, out errMsg))
{
ExecWriteToLog(ModbusPhrases.OK);
result = true;
}
else
{
ExecWriteToLog(errMsg + "!");
}
}
else
{
ExecWriteToLog(ModbusPhrases.LrcError);
}
}
}
else
{
ExecWriteToLog(ModbusPhrases.IncorrectAduLength);
}
}
else
{
ExecWriteToLog(ModbusPhrases.CommErrorWithExclamation);
}
return(result);
}
/// <summary>
/// Run ASCII query
/// </summary>
public bool AsciiRequest(DataUnit dataUnit)
{
if (!CheckConnection())
{
return(false);
}
var result = false;
// sending request
ExecWriteToLog(dataUnit.ReqDescr);
Connection.WriteLine(dataUnit.ReqStr, out string logText);
ExecWriteToLog(logText);
// reception of the answer
string line = Connection.ReadLine(Timeout, out logText);
ExecWriteToLog(logText);
int lineLen = line == null ? 0 : line.Length;
if (lineLen >= 3)
{
int aduLen = (lineLen - 1) / 2;
if (aduLen == dataUnit.RespAduLen && lineLen % 2 == 1)
{
// getting ADU response
var aduBuf = new byte[aduLen];
var parseOK = true;
for (int i = 0,
j = 1;
i < aduLen && parseOK;
i++, j += 2)
{
try {
aduBuf[i] = byte.Parse(line.Substring(j, 2), NumberStyles.HexNumber);
} catch {
ExecWriteToLog(ModbusPhrases.IncorrectSymbol);
parseOK = false;
}
}
if (parseOK)
{
if (aduBuf[aduLen - 1] == ModbusUtils.CalcLRC(aduBuf, 0, aduLen - 1))
{
// answer decryption
string errMsg;
if (dataUnit.DecodeRespPDU(aduBuf, 1, aduLen - 2, out errMsg))
{
ExecWriteToLog(ModbusPhrases.OK);
result = true;
}
else
{
ExecWriteToLog(errMsg + "!");
}
}
else
{
ExecWriteToLog(ModbusPhrases.LrcError);
}
}
}
else
{
ExecWriteToLog(ModbusPhrases.IncorrectAduLength);
}
}
else
{
ExecWriteToLog(ModbusPhrases.CommErrorWithExclamation);
}
return(result);
}