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MODBUS_REPLY_EXCEPTI(3)	       libmodbus Manual	       MODBUS_REPLY_EXCEPTI(3)

NAME
       modbus_reply_exception -	send an	exception reponse

SYNOPSIS
       *int modbus_reply_exception(modbus_t *ctx, const	uint8_t	*req, unsigned
       int exception_code);

DESCRIPTION
       The modbus_reply_exception() function shall send	an exception response
       based on	the exception_code in argument.

       The libmodbus provides the following exception codes:

       o   MODBUS_EXCEPTION_ILLEGAL_FUNCTION (1)

       o   MODBUS_EXCEPTION_ILLEGAL_DATA_ADDRESS (2)

       o   MODBUS_EXCEPTION_ILLEGAL_DATA_VALUE (3)

       o   MODBUS_EXCEPTION_SLAVE_OR_SERVER_FAILURE (4)

       o   MODBUS_EXCEPTION_ACKNOWLEDGE	(5)

       o   MODBUS_EXCEPTION_SLAVE_OR_SERVER_BUSY (6)

       o   MODBUS_EXCEPTION_NEGATIVE_ACKNOWLEDGE (7)

       o   MODBUS_EXCEPTION_MEMORY_PARITY (8)

       o   MODBUS_EXCEPTION_NOT_DEFINED	(9)

       o   MODBUS_EXCEPTION_GATEWAY_PATH (10)

       o   MODBUS_EXCEPTION_GATEWAY_TARGET (11)

       The initial request req is required to build a valid response.

RETURN VALUE
       The function shall return the length of the response sent if
       successful. Otherwise it	shall return -1	and set	errno.

ERRORS
       EINVAL
	   The exception code is invalid

SEE ALSO
       modbus_reply(3) libmodbus(7)

AUTHORS
       The libmodbus documentation was written by StA(C)phane Raimbault
       <stephane.raimbault@gmail.com>

libmodbus v3.1.6		  03/01/2021	       MODBUS_REPLY_EXCEPTI(3)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | SEE ALSO | AUTHORS

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