Protocol analysis
R&S
®
RTO6
703
User Manual 1801.6687.02 ─ 05
Word Format
Figure 13-25: Structure of an ARINC 429 word
An ARINC 429 word is 32-bits and consists of the following parts (see
):
●
Parity: the most significant bit (MSB). Checks if there are bit errors during the trans-
mission. The total number of logic 1 bits for the word shall be odd.
●
Sign/Status Matrix (SSM): the value of these bits depends on the data type. It may
be used to report the status of hardware equipment.
●
Data:
–
Binary (BNR): stores the data as a binary number.
–
Binary Coded Decimal (BCD): uses 4 data field bits to represent a decimal
digit.
–
Discrete data: a combination of BNR and/ or BCD or individual bits that express
specific equipment conditions.
–
Maintenance data and acknowledgment
–
Williamsburg / Buckhorn protocol: a bit-oriented protocol that is used for file
transfer.
●
Source/Destination Identifier (SDI): indicates the intended receiver or the transmit-
ting subsystem.
●
Label: gives information about the word's data type.
For comfortable analysis, you can load an editable label list, to interpret transferred
numeric values as meaningful text labels.
13.13.2
ARINC 429 configuration
13.13.2.1
ARINC 429 configuration settings
Access: [Bus] > "ARINC 429" > "Setup" tab
Make sure that the tab of the correct serial bus is selected.
ARINC 429 (option R&S
RTO6-K530)