-
after CFDIU power-up (+ confirmation), the CFDIU retransmits at NO = 00 the last labels acquired correctly, i.e. received with the correct state during a CFDIU power-up or during phase 1/2 transition (as this value is memorized in EEPROM). This (these) label(s) transmitted at NO = 00 is (are) frozen, even after other phase 1/2 transitions, as long as it (they) remains (remain) incorrect.

 If moreover a CFDIU power cutoff occurs, the CFDIU retransmits at NO = 00 the last labels acquired correctly (as this value is memorized in EEPROM). The DMC1 is declared invalid (but not failed) by the CFDIU when at least one of the labels of the "engine serial number" parameter is transmitted at NCD or at FT, confirmed over 3 cycles. In this case, the CFDIU performs a processing which is identical to that of the previous case.
 NOTE : - During the confirmation times related to the invalid or
____ failed state, the CFDIU retransmits at NO the last correct labels acquired.
 -When the invalid or failed state disappears, the CFDIU resumes parameter normal transmission at the following acquisition (power up or phase 1/2 transition).
 NOTE : The labels used for transmitting these parameters and the
____ transmission rates are indicated in the associated table.
 **ON A/C 001-049, 051-099, 101-105, 151-154, 201-207,
 (Ref. Fig. 021)
R **ON A/C 106-149, 155-199, 208-299, 301-399, 401-499,
 (Ref. Fig. 021A)
 1EFF : ALL 1 31-32-00Page A19 1 1 Aug 01/05 1 1 1CES 1 **ON A/C ALL

 D. Interface with the On-Board Printer
 (1)
 Architecture

 The on-board printer is located in the cockpit, on the rear right section of the center pedestal. The printer enables the data, sent by the various systems connected to it, to be printed (multi-input printer). As the CFDS is itself connected to other aircraft systems, the printer enables the data stored in the CFDIU or in the systems connected to it to be printed.

 (2)
 General rules for printing CFDIU data

 -
The CFDIU has a buffer memory with a capacity equal to one MCDU screen page in which it memorizes the CFDIU page.

 -
The CFDIU controls transmission of the contents of the page displayed.

 (3)
 General rules for printing data from systems connected to the CFDIU

 Each system connected to the CFDS supervises printing of the data pages:
 -
The CFDIU memorizes the page displayed and sent by the system.

 -
The CFDIU controls transmission of the contents of the page

 displayed. If the quantity of data to be sent to the printer is greater than the capacity of one page, printing is carried out page after page.
 The CURRENT LEG REPORT and CURRENT LEG ECAM REPORT information can be printed in flight.
 (Ref. Fig. 022, 023)
 1EFF : ALL 1 31-32-00Page A20 1 1 May 01/05R 1 1 1CES 1

 CFDIU - Printer Interface Architecture Figure 022
 1EFF : 1 1R 1CES  ALL  1 11 1 31-32-00 Page A21 May 01/05

 CFDIU - Process for Printing a Page Figure 023 
R 1EFF : 1 1 1CES  ALL  1 111 31-32-00 Page A22 May 01/05

R **ON A/C 001-049, 051-099, 101-105,

 E. Interface with ACARS
 (1)
 Architecture The ACARS management unit is located in the avionics compartment (80VU) and it uses VHF3. The ACARS enables transmission to the ground of data sent by the various systems connected to it.

 (2)
 General rules for the transmission of CFDIU and systems data The ACARS installation leads to the following modifications for the CFDIU:

 -
Real-time transmission of internal fault messages : . from the systems (Types 1 and 2), . created by the CFDIU (Type 3, transformation of external faults into internal faults).

 -
Real-time transmission of warning messages from the FWCs.

 -Transmission at the end of flight of the Post Flight Report filtered or not filtered : . when requested manually, . or automatically.
 -Transmission, when requested manually, of system pages obtained from the System Report/Test function.
 -Addition, in the CFDIU main menu, of a page of programming of the functions mentioned above and, their transmission to the printer.
 -Activation of the ACARS pin programming discrete.

 (3)
 Processing to be carried out before transmission
 The CFDIU must:

 -Check that all the characters to be transmitted are included in the set of transmissible characters. The characters that do not belong to this set must be replaced with an X.
 -If necessary, break down the message to be transmitted into blocks
　
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