File 8, which is always an alphanumeric file, contains message records, which are written to the display under control of the 7526 DCT by the key commands :0 or :E, or the host commands CMD B or CMD C.
File 8 has a maximum record length of 40 characters and contains between 10 and 1000 records.
Records numbers 0-999 are used by the DCTs. The records must be loaded sequentially and each blank record must contain a record separator (RS).
All messages sent to the DCTs are transmitted as variable length records terminated with a record separator (RS).
The total number of records is user-defined, however, the first ten records (0-9) are reserved for system messages which must be downloaded by the user. Their function is defined in Table 8. .
Records are automatically numbered by the 7526 DCT based on the number of RS characters ahead of them in File 8. For example, if the only messages defined are 0-9 and 20, record separator characters must be loaded for messages 10-19. However, it is not necessary to place record separators for records 21-999.
Table 8. Prompt Message Description
+=====+=====+========+=====================================+=================+ | Record | Prompt Message Description | +=====+=====+========+=====================================+=================+ | 00 | Normal idle loop prompt | +-----+-----+--------+-------------------------------------+-----------------+ | 01 | Timeout prompt | +-----+-----+--------+-------------------------------------+-----------------+ | 02 | Invalid length prompt | +-----+-----+--------+-------------------------------------+-----------------+ | 03 | Invalid data prompt | +-----+-----+--------+-------------------------------------+-----------------+ | 04 | Invalid operation prompt | +-----+-----+--------+-------------------------------------+-----------------+ | 05 | Fast clocking idle loop prompt | +-----+-----+--------+-------------------------------------+-----------------+ | 06 | Interactive/buffered mode prompt (waiting for host) | +-----+-----+--------+-------------------------------------+-----------------+ | 07 | Interactive mode prompt (host down, buffering data) | +-----+-----+--------+-------------------------------------+-----------------+ | 08 | Good prompt (data collection sequence completed correctly) | +-----+-----+--------+-------------------------------------+-----------------+ | 09 | Link prompt | +-----+-----+--------+-------------------------------------+-----------------+ | 10-999 | Optional&mdash.depending on the application | +-----------+----------------------------------------------------------------+