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6.4.2

Type

Scale

Length

6.4.3

Type

Scale

Length

Q.series

Gantner Instruments

BCD data decoding

BCD, or binary-coded-decimal, is also a common data format found in

ARINC 429. In this format, four bits are allocated to each decimal digit. A

general BCD word is shown in Figure 6-2. Its data fields contain up to five

sub-fields.

Figure 6-2 BCD Word Format

The most significant sub-field contains only the bits, so that its maximum

decimal value can be 7. If the maximum decimal value is greater than 7,

bits 29 through 27 are padded with zeros and the second sub-field

becomes the most significant.

Set to bcd to decode ARINC words in binary-coded decimal format.

Specify the scale factor (or range) for binary coded decimal encoding. The

decoded value is multiplied by this factor (for example 0.1 or 100).

Specify the number of bits used to represent the data.

Use this type to read the raw data format without any decoding.

Set to raw to read ARINC words in raw format without decoding.

Not used.