Protocol for Data Exchange - Flow Diagram Figure 011
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-Determination of the transmitted word The system transmits a word every 10 ms on the ARINC line. The following considerations give the type of word transmitted (VHF1, HF2, status request word, etc): In the basic transmission function a word is sent every 10 ms in the following order: Word 00: Status request word Word 01: VHF1 volume control word Word 02: VHF2 volume control word Word 03: VHF3 volume control word Word 04: HF1 volume control word Word 05: HF2 volume control word Word 06: INT volume control word Word 07: CAB volume control word Word 08: PA volume control word Word 09: VOR1 volume control word Word 10: VOR2 volume control word Word 11: MKR volume control word Word 12: ILS volume control word Word 13: spare volume control word Word 14: ADF1 volume control word Word 15: ADF2 volume control word
This cyclic transmission continues provided that no volume control modification or any other data modification appears. As soon as a modification is detected at any data level, the system emits the concerned word every 10 ms until this data is fixed (end of modifications). However, a complete basic cycle is emitted after 160 ms to up-date, if applicable, other data. Moreover, the status request word will be emitted systematically every 160 ms irrespective of the data modifications in progress
-AMU data reception During reception, the system reads the word delivered by the associated AMU on the ARINC reception line. This word arrives every 160 ms and gives the SELCAL call status, transmission channel return and pin-programming status. A set of checks is made each time a word is received: Counting of the number of received words: Check of the label Check of the SDI, Sign Status, Matrix Recalculation of the parity and verification.
-Displays The system updates the parameter displays every 10 ms. The VOICE status is directly displayed. The status of the transmissions is displayed only after acknowledgement by the AMU.
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-Internal test This test checks the check-sum of the ROM. The RAM is checked at each energization. During operation, the microprocessor must cyclically check its peripherals.
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-Label table
-------------------------------------------------------------------------------
| | | BINARY | | |
| | OCTAL | b b b b b b b b | HEX | SDI |
| | | 7 6 5 4 3 2 1 0 | | |
-------------------------------------------------------------------------------| Status request word | 300 | 0 0 0 0 0 0 1 1 | 03 | 00 | | Status word from AMU | 301 | 1 0 0 0 0 0 1 1 | 83 | 00 | | Volume control word VHF1 | 210 | 0 0 0 1 0 0 0 1 | 11 | 01 | | Volume control word VHF2 | 210 | 0 0 0 1 0 0 0 1 | 11 | 10 | | Volume control word VHF3 | 210 | 0 0 0 1 0 0 0 1 | 11 | 11 | | Volume control word HF1 | 211 | 1 0 0 1 0 0 0 1 | 91 | 01 | | Volume control word HF2 | 211 | 1 0 0 1 0 0 0 1 | 91 | 10 | | Volume control word INT | 215 | 1 0 1 1 0 0 0 1 | B1 | 01 | | Volume control word CAB | 215 | 1 0 1 1 0 0 0 1 | B1 | 10 | | Volume control word PA | 212 | 0 1 0 1 0 0 0 1 | 51 | 11 | | Volume control word VOR1 | 213 | 1 1 0 1 0 0 0 1 | D1 | 01 | | Volume control word VOR2 | 213 | 1 1 0 1 0 0 0 1 | D1 | 10 | | Volume control word MKR | 213 | 1 1 0 1 0 0 0 1 | D1 | 11 | | Volume control word ILS | 217 | 1 1 1 1 0 0 0 1 | F1 | 00 | | Volume control word spare| 220 | 0 0 0 0 1 0 0 1 | 09 | 00 | | Volume control word ADF1 | 212 | 0 1 0 1 0 0 0 1 | 51 | 01 | | Volume control word ADF2 | 212 | 0 1 0 1 0 0 0 1 | 51 | 10 | -------------------------------------------------------------------------------
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B. SELCAL Code Panel
(1)
Purpose The SELCAL code panel is used to program the SELCAL code assigned to the aircraft.
(2)
Description (Ref. Fig. 012) This panel is a rectangular box in compliance with ARINC 714. The front face features:
-4 knurled knobs for selection of a code made up of 4 letters from amongst the following: A - B - C - D - E - F - G - H - J - K - L - M- N - P - Q - R - S.
-A plexiglass cover over the knurled knobs which protects the displayed code. The operator can read the code through the cover. The rear face is equipped with a round connector for connection to the aircraft electrical network.
(3)
Operation (Ref. Fig. 013, 014) In accordance with the BCD code, each of the knurled knobs opens the various circuits or connects the various circuits to the ground. This selects the different frequency filters assigned to the considered codes.
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