public Result WriteSingleRegister(ModBusSingleWriteRequest req)
{
if (HardwareInterface.PacketsInSendingList > _maxSendCapacity)
{
return(Result.FullBuffer);
}
if (Mode == ModBusMode.RTU)
{
byte[] message = RtuMakeFunction5(req, ModbusFunctions.WriteSingleRegister);
return(HardwareInterface.SendOverSerialPort(Port, message));
}
return(Result.NotImplemented);
}
private byte[] RtuMakeFunction5(ModBusSingleWriteRequest req, ModbusFunctions function)
{
var message = new byte[8];
message[0] = (byte)req.SlaveAddress;
message[1] = (byte)function;
message[2] = (byte)(req.StartAddress >> 8);
message[3] = (byte)req.StartAddress;
message[4] = (byte)(req.NewValue >> 8);
message[5] = (byte)req.NewValue;
var crc16 = ModbusUtility.ComputeCRC16(message, 0, message.Length - 2);
message[message.Length - 2] = crc16[0];
message[message.Length - 1] = crc16[1];
return(message);
}
