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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 success- ful. 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()
Name | Synopsis | Description | Return value | Errors | See also
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