Version 1: 64 Words/sec
 Version 2: 128 Words/sec

R **ON A/C 106-149, 211-299, 301-399, 401-499,
 A. Flight Data Interface And Management Unit (FDIMU) (Ref. Fig. 008A, 009A, 010A) The FDIMU is a microprocessor controlled unit, used for the collection of discrete and digital A/C parameters and for their conversion to a recordable form. The FDIMU puts together the functions of the DFDRS and the AIDS (REF: 31-36-00). It has two internal main parts. These parts are:
 -
The FDIU-part, which controls the DFDRS

 -
The DMU-part, which controls the AIDS (Refer to 31-36-00). The function and the electrical interface complies with ARINC 717.

 If more than one data bus with the same content, e.g. SDAC 1 and SDAC 2, is connected to the FDIU-part, the data from system 1 is recorded on the DFDR. This is as long as the appropriate SSM bits are valid and the data is updated. Invalid data from system 1 is replaced with the appropriate data from system 2. If one system has bad SSM bits or unrefreshed data, data from the other system are recorded. If no valid data is available for the DFDR recording, then related data bits are set to zero and in the next mainframe period the respective data bits are set to one.
 The FDIU-part can record five different versions (frames) of parameters on the DFDR. The selection for one version is made by the A/C Pin-Programming. If a version is not set, the FDIU-part uses the code from the last flight. In case of missing information from the last flight, the FDIU-part works with Version 2 (CFMI frame) and record speed 128 W/s. The five record versions fulfil the different authority's requirements:
 -
Version 1 and 2: ED55 parameter frame (1 to 57 parameters), record speed 128 Words/sec

 -
Version 3,4 and 5: FAR 121.344 parameter frame (1 to 88 parameters), record speed 256 Word/sec.

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 System Internal Interface
 Figure 010A

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 B. Input/Output Characteristics
 NOTE : The inputs listed below are only for the FDIU-part of the FDIMU.
____
 (1)
 Parameter inputs: 15 DITS-ARINC 429 input ports, 10 shared with the DMU-part.

 (2)
 System inputs:
 DFDR Playback Data Input

 -Playback of the DFDR data for verification.
 DFDR BITE IN

 -Status line from DFDR.
 54 discrete inputs

 -Used for A/C Identification.
 QAR FAIL (if QAR is installed)

 -Status line from the QAR.
 QAR MEDIA LOW (if QAR is installed)

 -Media indication from the QAR.
 EVENT MARKER

 -Status line from the EVENT MARKER button in the cockpit. MDDU
 -Select line.
 **ON A/C 151-154, 159-199, 201-207, 210-210,
 B. Input/Output Characteristics
 (1)
 Parameter inputs: 16 DITS-ARINC 429 input ports, 12 ports Low/High speed selectable (Low: 12.28 Kbit/s, High: 100 Kbit/s) 4 shunt discrete inputs.

 (2)
 System inputs:
 DFDR Playback Data Input

 -playback of the DFDR data for verification
 DFDR BITE IN

 -status line from DFDR
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 Post SB 31-1154 For A/C 151-154,201-207,
 B. Input/Output Characteristics
 (1)
 Parameter Inputs: 16 DITS-ARINC 429 input ports, 12 ports Low/High speed selectable (Low: 12.28 Kbit/s, High: 100 Kbit/s) 4 shunt discrete inputs.

 (2)
 System Inputs:
 DFDR Playback Data Input

 -playback of the DFDR data for verification DFDR BITE IN
 -
status line from DFDR
 QAR FAIL

 -
status line from the QAR
 QAR MEDIA LOW

 -media indication from the QAR

R **ON A/C 106-149, 211-299, 401-499,
 (3) Output Characteristics
 1 DITS-ARINC 429 output port (Low speed)
 1 DFDR bus, harvard biphase code

 -
128/256 words/sec.
 1 QAR bus, RZ code

 -
128/256 words/sec. 1 status line, a discrete output to send the FDIU-part status via SDAC to the CFDS 1 asynchronous output for test purposes in RS 232 characteristic 1 audio output for time synchronization of DFDR and Cockpit Voice Recorder (CVR).

 **ON A/C 151-154, 159-199, 201-207, 210-210,
 (3) Output Characteristics
 1 DITS-ARINC 429 output port (Low speed)
　
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