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Questions tagged [arinc-429]

ARINC 429 is both an electrical bus standard and a data transfer standard for aircraft avionics.

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Why does the SSM decoding vary between different A429 label types

For A429 there are different label types, for example: BCD, BNR, Discrete... These types have their corresponding SSM (Sign/Status Matrix) that is unique, for example an SSM of "00" represents a ...
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1answer
107 views

USB interface for FDR?

Currently I am investigating the feasibility of transmitting a limited amount of FDR data via radio link for domestic flights within continental USA. I am working on building a prototype system in ...
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2answers
143 views

What are the major aircraft systems (LRUs) using the ARINC429 Protocol?

I want to know the different aircraft systems (LRUs) using ARINC429 protocol. Why is it used instead of the ARINC 629 ? How is it different from the different ARINC protocols like 629 and AFDX(664)?
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146 views

What is the purpose of the selected altitude/airspeed in ARINC 429?

What is the purpose of the selected altitude and airspeed fields in ARINC 429?
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232 views

How many labels are defined in ARINC 429 for calibrated altitude?

How many labels are defined in ARINC 429 for calibrated altitude?
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1answer
131 views

Is it possible to communicate an everyday computer with the ARINC bus? [closed]

Lately I've been wondering if it's possible to interface an everyday computer with the ARINC buses (either 429 or AFDX). This would be very useful for simulation, testing and prototyping purposes. ...
2
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1answer
170 views

What is the “true static pressure”?

What is true static pressure? How do we define it? Is it same as corrected static pressure for installation and errors? ARINC 429P1-18 defines Static pressure as corrected and uncorrected where in ...
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1answer
147 views

What is the criteria for selecting BNR or BCD as data encoding in ARINC429

I was going through ARINC429 part1-18 and found all the labels that are defined along with transmission bit and data encoding. What is the criteria for choosing BNR or BCD for data encoding ? Why are ...
2
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1answer
158 views

Why apply resolutons in data words for ARINC 429 bus

Data words transported over the ARINC 429 bus are defined and built-in units, ranges, refresh rates, number of significant bits, and resolution. Why is it necessary to include resolution? Does ...
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3answers
801 views

What are the “parts” of a SID procedure?

In the ARINC 424 (downloadable from this link), the following information about SIDs procedures is given in the section 5.7 Route Type (RT TYPE): As you can see, it appears to me that a procedure is ...
3
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1answer
739 views

What is the difference between Body Pitch Rate and Inertial Pitch Rate?

ARINC 429 specifies two series of attitude rate labels for ADIRS/AHRS/IRS systems: Body 326 : Body Pitch Rate 327 : Body Roll Rate 330 : Body Yaw Rate Inertial 336 : Inertial Pitch Rate 337 : ...
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1answer
865 views

How to set frequency and distance in ARINC 429?

How can I set frequency & read distance in ARINC 429? For example can you give an example to tune a 1105.5 MHz and read 25786 ft. ...
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1answer
1k views

How to encode an altitude in ARINC429?

How can I encode an altitude (ft) in ARINC429? I didn't understand if I just need to transform it in binary number and then use the "Bipolar Return-to-Zero". Like for example with an altitude of 25 ...
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2answers
312 views

In the ARINC specification, why is baro altitude (label 204) measured in Knots?

I am currently designing a system that reads the baro altitude (on label 204) from an LRU. Ultimately in my software I would like to display the baro altitude reading in real-time using a graphical ...
9
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1answer
3k views

Why use different data bus for civil and military avionics?

There are various type of data bus in aviation, the two most common in the '90 were ARINC 429 for civil aviation and Mil 1553 for military applications. They are not very different one for the other, ...
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2answers
2k views

In ARINC 429 where are the bits indicating the hex value of Equipment ID?

I'm a newbie in ARINC-429 standard; the following might be a very simple issue for you. In ARINC 429 the LABEL field is covered by the bits 1 through 8; which bits are covering the Equipment ID? For ...
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1answer
640 views

Numerous questions regarding ARINC429 protocol [closed]

I recently made significant progress in my understanding on the ARINC429 thanks to a user on this site, but I after reading more into it, I may have confused myself a little bit. Any help on any of ...
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2answers
6k views

How to decode ARINC 429 data?

I am looking for some help regarding decoding ARINC 429 data. I have a CSV document that contains sequentially stored ARINC 429 labels. My overall goal is to be able to scan for 4 specific labels and ...
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3answers
2k views

What is the Scaling Factor in ARINC 429?

I'm a newly appointed engineer in an avionics company and have been tasked with preparing a report on ARINC429. I understand most of it, and I certainly find it simpler that 664, but I still can't ...
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2answers
2k views

Are the discrete I/O considered to be part of the ARINC interface?

A typical connection used to transmit/receive ARINC data might consist of a cable and a connector similar to the one shown below. Although ARINC transmit/receive channels aren't the only thing this ...
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1answer
413 views

What is the technical term for ARINC 429 data injected into a heartbeat stream going to an LRU?

I am going to describe a type of communication protocol that I've seen used with ARINC 429 and would like to know if there is a proper name and classification for this type of communication... Anyway, ...
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1answer
172 views

Can an ARINC 429 controller set to receive messages on high-speed (100kHz) see 12.5kHz messages?

I am working with an ARINC 429 controller which is currently set to receive messages at 100kHz. When the transmission line sends messages that are 12.5kHz (standard ARINC 429 low speed) the controller ...
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2answers
1k views

How are the BNR and BCD data formats identified in an ARINC-429 message?

I'm a newbie in ARINC-429 standard. How does the receiver identify which data is in BCD format and which is BNR? I understand that labels indicate the message data carried information, but it does not ...
2
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1answer
247 views

In the ARINC specification, does “sig bits” include the sign bit?

In the ARINC specification, there are sections where all of the different labels (and their pay-loads) are described. In each of the tables where the labels are defined, there is a column called sig ...
3
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1answer
158 views

Is there an ARINC label/data that can be associated with a gyroscope's precession?

I am looking to read the precession of a gyroscope off of an ARINC bus, is there an ARINC label that can be associated with the gyroscope's precession value? My thoughts are, that it might have ...
3
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1answer
2k views

Is there a such thing as an ARINC label for the yaw angle?

Is there a way to check the yaw angle on the ARINC bus? If so, what is the associated ARINC-429 label?
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2answers
6k views

What is the encoding difference between ARINC 429 BNR and BCD formats?

I think I have an understanding of the differences between the types of ARINC word formats, but would just like to get some input to see if my understanding is correct. In the ARINC 429 specification, ...