22-01-2013, 09:57 AM
ARINC429
[attachment=47958]
ABSTRACT:
ARINC 429 is a specification, which defines how avionics equipment and
systems should communicate with each other. They are interconnected by wires in twisted pairs. The specification defines the electrical and data characteristics and protocols, which are used. ARINC 429 employs a unidirectional data bus standard known as Mark 33 Digital Information Transfer System (DITS). Messages are transmitted at a bit rate of either 12.5 or 100 kilobits per second to other system elements, which are monitoring the bus messages. Transmission and reception is on separate ports so that many wires may be needed on aircraft, which use a large
number of avionics systems.
ARINC 429 has been installed on most commercial transport aircraft including; Airbus A310/A320 and A330/A340; Bell Helicopters; Boeing 727, 737, 747, 757, and 767; and McDonnell Douglas MD-11. Boeing is installing a newer system specified as ARINC 629 on the 777, and some aircraft are using alternate systems in an attempt to reduce the weight of wire needed and to exchange data at a higher rate than is possible with ARINC 429.
New airplane designs in the 21st century continue to employ the ARINC 429 bus for data transmission. The relative simplicity and integrity of the bus, as well as the ease of certification are characteristics that contribute to the continued selection of the ARINC 429 bus when the required data bandwidth is not critical. The unidirectional ARINC 429 system provides high reliability at the cost of wire weight and limited data rates.
[attachment=47958]
ABSTRACT:
ARINC 429 is a specification, which defines how avionics equipment and
systems should communicate with each other. They are interconnected by wires in twisted pairs. The specification defines the electrical and data characteristics and protocols, which are used. ARINC 429 employs a unidirectional data bus standard known as Mark 33 Digital Information Transfer System (DITS). Messages are transmitted at a bit rate of either 12.5 or 100 kilobits per second to other system elements, which are monitoring the bus messages. Transmission and reception is on separate ports so that many wires may be needed on aircraft, which use a large
number of avionics systems.
ARINC 429 has been installed on most commercial transport aircraft including; Airbus A310/A320 and A330/A340; Bell Helicopters; Boeing 727, 737, 747, 757, and 767; and McDonnell Douglas MD-11. Boeing is installing a newer system specified as ARINC 629 on the 777, and some aircraft are using alternate systems in an attempt to reduce the weight of wire needed and to exchange data at a higher rate than is possible with ARINC 429.
New airplane designs in the 21st century continue to employ the ARINC 429 bus for data transmission. The relative simplicity and integrity of the bus, as well as the ease of certification are characteristics that contribute to the continued selection of the ARINC 429 bus when the required data bandwidth is not critical. The unidirectional ARINC 429 system provides high reliability at the cost of wire weight and limited data rates.