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modbus_reply_exception(3) [debian man page]

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 modbus_reply_exception() 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 Stephane Raimbault <stephane.raimbault@gmail.com[1]>

NOTES

	1. stephane.raimbault@gmail.com
	   mailto:stephane.raimbault@gmail.com

libmodbus 3.0.3 						    05/26/2012						   MODBUS_REPLY_EXCEPTI(3)

Check Out this Related Man Page

MODBUS_SET_RESPONSE_(3) 					 Libmodbus Manual					   MODBUS_SET_RESPONSE_(3)

NAME

       modbus_set_response_timeout - set timeout for response

SYNOPSIS

       void modbus_set_response_timeout(modbus_t *ctx, struct timeval *timeout);

DESCRIPTION

       The modbus_set_response_timeout() function shall set the timeout interval used to wait for a response. If the waiting before receiving the
       response is longer than the given timeout, an error will be raised.

RETURN VALUE

       There is no return values.

EXAMPLE

	   struct timeval old_response_timeout;
	   struct timeval response_timeout;

	   /* Save original timeout */
	   modbus_get_response_timeout(ctx, &old_response_timeout);

	   /* Define a new and too short timeout! */
	   response_timeout.tv_sec = 0;
	   response_timeout.tv_usec = 0;
	   modbus_set_response_timeout(ctx, &response_timeout);

SEE ALSO

       modbus_get_response_timeout(3) modbus_get_byte_timeout(3) modbus_set_byte_timeout(3)

AUTHORS

       The libmodbus documentation was written by Stephane Raimbault <stephane.raimbault@gmail.com[1]>

NOTES

	1. stephane.raimbault@gmail.com
	   mailto:stephane.raimbault@gmail.com

libmodbus 3.0.3 						    05/26/2012						   MODBUS_SET_RESPONSE_(3)
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