------------------------------------| BIT | 11 | 12 | 13 | 14 | |----------|-----|-----|-----|-----| | NONE | 0 | 0 | 0 | 0 | |----------|-----|-----|-----|-----| | VHF1 | 1 | 0 | 0 | 0 | |----------|-----|-----|-----|-----| | VHF2 | 0 | 1 | 0 | 0 | |----------|-----|-----|-----|-----| | VHF3 | 1 | 1 | 0 | 0 | |----------|-----|-----|-----|-----| | HF1 | 0 | 0 | 1 | 0 | |----------|-----|-----|-----|-----| | HF2 | 1 | 0 | 1 | 0 | |----------|-----|-----|-----|-----| | INT | 0 | 1 | 1 | 0 | |----------|-----|-----|-----|-----| | CAB | 1 | 1 | 1 | 0 | |----------|-----|-----|-----|-----| | PA | 0 | 0 | 0 | 1 | ------------------------------------
b15 : Radio PTT switch (active at 1) b16 : Interphone PTT switch (active at 1) b17 to b24 : Byte which defines the volume contro
channel defined by the label and the
b25 : Bit which defines ON or OFF status o
channel (active at 1)
b26 : Bit which sets VOICE filter into ser
b27 : Call reset (active at 1)
b28 to b31 : Error : Bits which give a b32 : Parity bit.
-Status word The AMU transmits a single type of word designated : status word. Its structure is as follows :
1EFF : ALL 1 23-51-00Page 35 1 1 Feb 01/04R 1 1 1CES 1
b b b b b b b b b b b b b b b 32 31 30 29 25 24 17 16 15 14 11 10 9 8 -------------------------------------------------------------------------------
|P |0 |0 | | | | | | |
| | | | A A A A A | | A A | E E E E | 0 0 | Label 301 |
| | | | 4 3 2 1 0| | 6 5| 3 2 1 0| | |
| | | | | | | | | |
-------------------------------------------------------------------------------
b1 to b8 : Label 301 : Byte which defines the type of data
sent b9 to b10 : SDI : Set to 0 b11 to b14 : Return of transmission keyboard status for check in ACP
(the truth table is the same as the one used in the
volume control word). b15 : Status of ground crew call (active at 1). b16 : Status of Cabin Attendant call (active at 1). b17 to b24 : Byte which sends the pin-program information to the
ACPs. b17 VHF3 b18 HF1 b19 HF2 b20 ADF2 b21 MLS b22 Lock PA b23 Spare b24 Spare
b25 to b29 : Status of the calls VHF1, VHF2, VHF3, HF1 and HF2
(active at 1) b25 : VHF1 b26 : VHF2 b27 : VHF3 b28 : HF1 b29 : HF2 b30 : Status of the filter (active at 1) b31 : Set to O b32 : Parity bit
-Protocol for data exchange between the ACP and the AMU
(Ref. Fig. 011) After transmission of a word, and in accordance with its label, the ACP receives the status word or collects data. The status word is delivered by the AMU. The collected data is the data present on the ACP face. After reception of a word, and in accordance with its label, the AMU transmits the status word or uses the data transmitted by the ACP.
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