Pro II: Extension and Interface Modules
Pro II-ARINC-429 Rev. E
ADwin
186
ADwin-Pro II
Hardware, manual Dec. 2018
5.8.11 Pro II-ARINC-429 Rev. E
The module Pro II-ARINC-429 Rev. E provides an interface for the ARINC 429
serial bus with one transmitter and 2 receivers. Transmitter and receivers can
be run in parallel at the same time.
ARINC 429 interface
The interface of the module is implemented according to specification ARINC
429. The module is based on the interface HI-3582A by Holt Integrated Circuits
Inc.
You program the ARINC interface with
ADbasic
or
TiCoBasic
instructions.
ARINC 429 is a two-wire serial bus and the most widely used data bus stan-
dard for aviation. The bus operates with one transmitter and up to 20 receivers.
The bit transfer rate is 100 kBit/s (high speed) or 12.5 kBit/s (low speed).
ARINC 429 uses a self-clocking, self-synchronizing data bus protocol; Tx
(transmit) and Rx (receive) are on separate ports. The physical connection
wires are twisted pairs, named A and B.
Data can be transmitted in one direction only–simplex communication–with bi-
directional transmission requiring two channels or buses. The devices, line
replaceable units (LRU), are most commonly configured in a star or bus-drop
topology. Each LRU may contain multiple transmitters and receivers commu-
nicating on different buses.
Data words on the bus are 32 bits in length, and most messages consist of a
single data word. The transmitter constantly transmits either 32-bit data words
or the NULL state while receivers are monitoring the bus messages.
An ARINC 429 data word consists of 32 bits in 5 fields:
– label, 8 bits
– source/destination identifier (SDI), 2 bits
– data, 19 bits
– sign/status matrix (SSM), 2 bits
– parity, 1 bit
Module features
The module Pro II-ARINC-429 Rev. E provides one transmitter and 2 receiv-
ers, each of which using its own Fifo. Each Fifo can store 32 words maximum.
The module Pro II-ARINC-429 Rev. E provides the following features:
– Transmitter parity check
The transmitter parity check can be disabled. If enabled, the parity check
can set to even parity or odd parity.
Please note, that module receivers will always check for odd parity. Re-
ceiver parity check cannot be disabled.
– Label matching
Each of the 2 receivers can be programmed with up to 16 labels. If en-
abled, a receiver will only accept ARINC messages, which match one of
the programmed labels. Only accepted messages are copied to the re-
ceiver fifo.
Label matching can be enabled for each receiver independently.
