Functions
uint16_t	ModbusMaster::getResponseBuffer (uint8_t)
	Retrieve data from response buffer. More...

void	ModbusMaster::clearResponseBuffer ()
	Clear Modbus response buffer. More...

uint8_t	ModbusMaster::setTransmitBuffer (uint8_t, uint16_t)
	Place data in transmit buffer. More...

void	ModbusMaster::clearTransmitBuffer ()
	Clear Modbus transmit buffer. More...

Detailed Description

Function Documentation

§ getResponseBuffer()

uint16_t ModbusMaster::getResponseBuffer ( uint8_t u8Index )

Retrieve data from response buffer.

See also: ModbusMaster::clearResponseBuffer()

Parameters

u8Index index of response buffer array (0x00..0x3F)

Returns: value in position u8Index of response buffer (0x0000..0xFFFF)

Examples:: examples/Basic/Basic.pde, examples/PhoenixContact_nanoLC/PhoenixContact_nanoLC.pde, and examples/RS485_HalfDuplex/RS485_HalfDuplex.ino.

 {
   if (u8Index < ku8MaxBufferSize)
   {
     return _u16ResponseBuffer[u8Index];
   }
   else
   {
     return 0xFFFF;
   }
 }

§ clearResponseBuffer()

void ModbusMaster::clearResponseBuffer ( )

Clear Modbus response buffer.

See also: ModbusMaster::getResponseBuffer(uint8_t u8Index)

 {
   uint8_t i;
   
   for (i = 0; i < ku8MaxBufferSize; i++)
   {
     _u16ResponseBuffer[i] = 0;
   }
 }

§ setTransmitBuffer()

uint8_t ModbusMaster::setTransmitBuffer	(	uint8_t	u8Index,
		uint16_t	u16Value
	)

Place data in transmit buffer.

See also: ModbusMaster::clearTransmitBuffer()

Parameters

u8Index	index of transmit buffer array (0x00..0x3F)
u16Value	value to place in position u8Index of transmit buffer (0x0000..0xFFFF)

Returns: 0 on success; exception number on failure

Examples:: examples/Basic/Basic.pde, and examples/PhoenixContact_nanoLC/PhoenixContact_nanoLC.pde.

 {
   if (u8Index < ku8MaxBufferSize)
   {
     _u16TransmitBuffer[u8Index] = u16Value;
     return ku8MBSuccess;
   }
   else
   {
     return ku8MBIllegalDataAddress;
   }
 }

§ clearTransmitBuffer()

void ModbusMaster::clearTransmitBuffer ( )

Clear Modbus transmit buffer.

See also: ModbusMaster::setTransmitBuffer(uint8_t u8Index, uint16_t u16Value)