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ARINC 429 DATA BUS
AERONAUTICAL RADIO
INCORPORATION
describe the data
communication between the
systems used primarily on
commercial transport aircraft.
The documents are prepared
by the Airlines Electronic
Engineering Committee
(AEEC) and published by
Aeronautical Radio Inc.
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ARINC !" # $Digital Information Transfer System
(DITS)% # &ow speed
Adopted by the Industry in '"
It works on the data rate of 12-14.5 Kbits/se or 1!!
Kbits/se
Adantages
*imple+ ,ata -us&ow cost
Integrity of installations continuous integration of systems
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'.E/uipment Interconnection
*imple+ ,ata -us using only one transmitter and up to !0data receiers
They are connected by shielded 1 twisted pair of wires
The shields are grounded at both ends along the length ofthe cable
The shields are 2ept as short as possible
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Avionics System EvolutionAvionics Bus - ARINC-429
Single So"re # $"lti%le Sink3 4alf duple+ 5ne
Transmitting e/uipment sends data to a number of
receiing e/uipment (up to !0).
T'R' R! R6
&"s-1
to !0
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!.7odulation
ReturnTo8ero (R8) modulation is used
9oltage leels are used for this scheme
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Typical ARINC !" word format
A typical 32-bit ARINC 429 word has fveparts: 8-bit Label
ata area
parity bit
!o"rce#esti$atio$ Ide$tifer %!I&
!i'$#!tat"s (atri) %!!(&
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,irection of Information :low
Information flow only from T+ to R+
A separate data bus is used for each direction when
the two way data transmission is re/uired
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*he o$ly two parts o+ the word $eed are theI$+or,atio$ Ide$tifer %Label& a$d the parity bit
*ource; ,estination Identifier(*,I)*wo +"$ctio$s:
*o ide$ti+y which so"rce i$ the ,"ltisyste, is
tra$s,itti$' the data*o direct which si$ i$ the ,"ltisyste, sho"ldreco'$i.e the data*ign; *tatus 7atri+ (**7)
*he !i'$#!tat"s (atri) %!!(& is "sed +or twop"rposes:*o provide a si'$%/#-& or irectio$ o+ 0ow%ata&*o provide so"rce e1"ip,e$t stat"s i$+or,atio$ to
the si$s or vi.
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ARINC 629 AVIONICS DATA BUS
VARIOUS DATA BUSES
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ARINC "
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*upports a 7ultitransmitter and -i
directional approach to digital ,ata
communications
Employs a protocol referred to as
,ATAC (,igital Autonomous Terminal
Access Control)
'(I)* +2, (T*
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'(I)* +2, D'T' &0S
*i,e ivisio$ ("ltiple)
Li$ear "s
("ltiple *ra$s,itter Access
2 (bps ata Rate
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eca"se ,ore tha$ o$e ter,i$al ,aybe'i$ to tra$s,it whe$ the "s is +ree
a ,ethod o+ avoidi$' clashes ,"st be"sed
(ethod "sed by ARINC 29 is called
C!(A#CA
C!(A#CA is achieved by "se o+ threeti,ers - *ra$s,it I$terval %*I& - *er,i$al 5ap %*5&
*ynchroni?ation @ap (*@)
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(IDI* $D TI$I) DI'('$
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erformane
Signaling Rate
6773 6(bps
ARINC 429 - 6bps or 62-647bps
ARINC 29 - 2 (bps
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*o"%ling
6773 - *ra$s+or,er
ARINC 429 - irect
ARINC 29 - *ra$s+or,er
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rotool 3eat"res
'ess $ethod
6773 - *i,e ivisio$
ARINC 429 - ;i)ed %!i$'le*ra$s,itter&
ARINC 29 - C!(A#CA
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*?@
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-RAIN ACTI9ATI5N TEC4NIBE
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REA,IN@ *ECTI5N
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,I*CB**I5N
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7IN,7A
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*B77ARD
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7C
