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Questions tagged [arinc-429]

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

ARINC 429 is a data transfer standard for aircraft avionics which specify a bus connecting avionics equipment; and how data can be sent and received using the bus.

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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, the Mil is a little more complex. My question…
Gianni Alessandro
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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 manage to wrap my head around what "Scaling Factor"…
Michael Thomas
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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 istance: Equipment ID 002 hex (Flight Management…
nibbioreale
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Are there any standards for defining your own ARINC 429 labels?

Is anyone aware of any ground rules or best practices for defining your own ARINC 429 labels? Are there certain ranges of labels that correspond to groups of parameters like engine temps, rpms, etc? Am I basically free to start at Label 000 and…
ARINC_challenged
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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 few places I have heard this term "True static…
Huntkil
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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 indicate if the data is BCD format or BNR. If my…
five_thunder
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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 bits. For where the labels are designated as BNR,…
Snoop
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How are ARINC 429 BCD dd:mm:yy labels encoded?

Label 260 (Date) has a dd:mm:yr format, which requires 6 characters. How is this label typically coded? Here is my best guess based on the range of each digit: Bit # Another header 1-8 Label (260) 9 SDI 10 SDI 11 digit #6…
ARINC_challenged
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What is the format for standard ARINC 429 labels with 20 sig bits?

Certain standard labels in the ARINC 429 specification have 20 significant bits. For example, Label 110 (GNSS Latitude) has a range of +/- 180 degrees, with a resolution of .000172 degrees. In order to accomplish this, how is the word formatted?…
ARINC_challenged
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ARINC429 - Encoding and Decoding of BINARY DATA

In ARINC429 protocol, how to encode and decode FAN DISCHARGE STATIC PRESSURE (LABEL - 127). Range is 1.5 to 30.0 No of Sig. Bits - 11 Resolution is 0.016 What should be the value to be loaded into the word if my pressure value is 1.5 PSIA ? As per…
trinath karri
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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 some BNR while rest are BCD ?
Huntkil
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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 can see them. Is this normal for an ARINC 429…
Snoop
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A429 label 044, DME Identity Presence - Definition

Is there a bit by bit definition for the A429 label 044, DME Identity Presence? I have this label 044 coming out of a Collins DME-4000, but it is not defined in its documentation I have at hand (installation manual). Only distance, IDENT, tune echo,…
Kiamur
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Negative number in ARINC-429

I'm a little bit confused by representation of negative number in ARINC-429. Let's consider the following example: Significant bits is equal to 7 (it does not count sign bit), Resolution is equal to 1, DATA section has to represent -1…
M.Naszko
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How to identify transmit labels for a particular equipment in ARINC429?

As i can see, each equipment has a set of labels which the equipment may supposed to be received. Say if i am Equipment 03Ch (Tire pressure monitoring system), i will be configured to receive below labels LABEL 060 -> Tire pressure (Left…
trinath karri
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