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modbus_reply_exception()				modbus_reply_exception()

Name
     modbus_reply_exception - send an exception response

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:

     * MODBUS_EXCEPTION_ILLEGAL_FUNCTION (1)

     * MODBUS_EXCEPTION_ILLEGAL_DATA_ADDRESS (2)

     * MODBUS_EXCEPTION_ILLEGAL_DATA_VALUE (3)

     * MODBUS_EXCEPTION_SLAVE_OR_SERVER_FAILURE (4)

     * MODBUS_EXCEPTION_ACKNOWLEDGE (5)

     * MODBUS_EXCEPTION_SLAVE_OR_SERVER_BUSY (6)

     * MODBUS_EXCEPTION_NEGATIVE_ACKNOWLEDGE (7)

     * MODBUS_EXCEPTION_MEMORY_PARITY (8)

     * MODBUS_EXCEPTION_NOT_DEFINED (9)

     * MODBUS_EXCEPTION_GATEWAY_PATH (10)

     * 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 <modbus_reply.md>

							modbus_reply_exception()

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