arinc429（ARINC429）.doc

arinc429（ARINC429） The ARINC429 bus protocol was proposed by the Airlines Engineering Committee in July 1977 and was published and approved in the same month. Its full name is digital information transmission system DITS. The protocol standard specifies the digital information transmission requirements between avionics and related systems. ARINC429 is widely used in advanced civil aircraft, such as B-737, B757 and B-767, and Russian military aircraft have adopted similar technologies. Our corresponding standard is HB6096-SZ-01. The ARINC429 bus is simple in structure, stable in performance and strong in anti-interference. The biggest advantage is the high reliability, which is due to non centralized control, reliable transmission, good error isolation. ARINC429 features are as follows: 1. Transmission mode one way. The information can only be output from the transmitter of the communication device and transmitted to the interface of the other devices that need it through the transmission bus. But information must never go back to the interface that has been defined as sending information. When bidirectional transmission is required between two communication devices, an independent transmission bus is used in each direction. Because of the lack of 1553B bus BC, the tasks and risks of information distribution are no longer concentrated. 2, drive capability, each bus can connect no more than 20 receivers. Because the equipment is few, the information transmission has ample time to guarantee. 3 、 modulation mode adopts bipolar to zero three state code mode. 4. The transmission rate is divided into two levels. The bit rate at high speed is 100Kb/s. The bit rate of the system low speed working state is applied in the range of 12Kb/s~14.5Kb/s. The contents of the selected bit rate range of the error should be within 1%. High rate and low rate can not be transmitted on the same transmission bus. 5. The basic unit of synchronous mode transmission is the word, each consisting