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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 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 3.1.0                   10/06/2013           MODBUS_REPLY_EXCEPTI(3)