mbregs.c File Reference

Functions
ModbusError	modbusBuildRequest0304 (ModbusMaster *status, uint8_t function, uint8_t address, uint16_t index, uint16_t count)
	Builds request 03 (read multiple holding registers) or 04 (read multiple input registers) frame. More...
ModbusError	modbusBuildRequest06 (ModbusMaster *status, uint8_t address, uint16_t index, uint16_t value)
	Builds request 06 (write a single holding register) frame. More...
ModbusError	modbusBuildRequest16 (ModbusMaster *status, uint8_t address, uint16_t index, uint16_t count, uint16_t *values)
	Builds request 16 (write multiple holding registers) frame. More...
ModbusError	modbusBuildRequest22 (ModbusMaster *status, uint8_t address, uint16_t index, uint16_t andmask, uint16_t ormask)
	Builds request 22 (mask-write holding register) frame. More...

Function Documentation

modbusBuildRequest0304()

ModbusError modbusBuildRequest0304	(	ModbusMaster *	status,
		uint8_t	function,
		uint8_t	address,
		uint16_t	index,
		uint16_t	count
	)

Builds request 03 (read multiple holding registers) or 04 (read multiple input registers) frame.

Note

Requires F03M or F04M module (see Building liblightmodbus)

modbusParseRequest03 and modbusParseRequest04 macros are aliases of this function

Parameters

status	The master structure to load with the request frame
function	Function to be used in the request (03 or 04)
address	Address of slave to be requested
index	Address of the first register
count	Number of registers to be read

Returns

A ModbusError error code

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modbusBuildRequest06()

ModbusError modbusBuildRequest06	(	ModbusMaster *	status,
		uint8_t	address,
		uint16_t	index,
		uint16_t	value
	)

Builds request 06 (write a single holding register) frame.

Note

Requires F06M module (see Building liblightmodbus)

Parameters

status	The master structure to load with the request frame
address	Address of slave to be requested
index	Address of the register
value	The value to be written

Returns

A ModbusError error code

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modbusBuildRequest16()

ModbusError modbusBuildRequest16	(	ModbusMaster *	status,
		uint8_t	address,
		uint16_t	index,
		uint16_t	count,
		uint16_t *	values
	)

Builds request 16 (write multiple holding registers) frame.

Note

Requires F16M module (see Building liblightmodbus)

Parameters

status	The master structure to load with the request frame
address	Address of slave to be requested
index	Address of the first register
count	Number of registers to be written
values	The value to be written

Returns

A ModbusError error code

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modbusBuildRequest22()

ModbusError modbusBuildRequest22	(	ModbusMaster *	status,
		uint8_t	address,
		uint16_t	index,
		uint16_t	andmask,
		uint16_t	ormask
	)

Builds request 22 (mask-write holding register) frame.

Note

Requires F22M module (see Building liblightmodbus)

Parameters

status	The master structure to load with the request frame
address	Address of slave to be requested
index	Address of the register
andmask	The AND mask value
ormask	The OR mask value

Returns

A ModbusError error code

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