Modbus Object Management

Functions
boolean	Modbus::getTimeOutState ()
	get communication watch-dog timer state More...
int8_t	Modbus::query (modbus_t telegram)
	only for master More...
int8_t	Modbus::poll ()
	cyclic poll for master More...
int8_t	Modbus::poll (uint16_t *regs, uint8_t u8size)
	cyclic poll for slave More...

Detailed Description

Function Documentation

boolean Modbus::getTimeOutState

(

)

get communication watch-dog timer state

Return communication Watchdog state. It could be usefull to reset outputs if the watchdog is fired.

Returns

TRUE if millis() > u32timeOut

Definition at line 350 of file ModbusRtu.h.

int8_t Modbus::poll

(

)

cyclic poll for master

*** Only for Modbus Master *** This method checks if there is any incoming answer if pending. If there is no answer, it would change Master state to COM_IDLE. This method must be called only at loop section. Avoid any delay() function.

Any incoming data would be redirected to au16regs pointer, as defined in its modbus_t query telegram.

nothing

Returns

errors counter

Definition at line 513 of file ModbusRtu.h.

int8_t Modbus::poll	(	uint16_t *	regs,
		uint8_t	u8size
	)

cyclic poll for slave

*** Only for Modbus Slave *** This method checks if there is any incoming query Afterwards, it would shoot a validation routine plus a register query Avoid any delay() function !!!! After a successful frame between the Master and the Slave, the time-out timer is reset.

Parameters

*regs	register table for communication exchange
u8size	size of the register table

Returns

0 if no query, 1..4 if communication error, >4 if correct query processed

Definition at line 588 of file ModbusRtu.h.

int8_t Modbus::query

(

modbus_t

telegram)

only for master

*** Only Modbus Master *** Generate a query to an slave with a modbus_t telegram structure The Master must be in COM_IDLE mode. After it, its state would be COM_WAITING. This method has to be called only in loop() section.

See Also

modbus_t

Parameters

modbus_t

modbus telegram structure (id, fct, ...)

Todo:

finish function 15

Definition at line 425 of file ModbusRtu.h.