mbus A717 SubFrame At Index.vi
Description
The A717 SubFrame At Index is an easy function to extract ARINC 717 subframes or words out from ARINC 717 frames. This function uses the subframe size to parse multiple received ARINC 717 frames into subframes or words.
For example, in standard mode:
Considering the subframe size is equal to 64 words, received ARINC 717 frame shows:
| ARINC 717 word # | 12-bit word |
|---|---|
| Word #0 | 0x247 (1st sync word) |
| Word #1 | 0x000 (data 0) |
| Word #2 | 0x001 (data 1) |
| ... | ... |
| Word #63 | 0x03E (data 63) |
| Word #64 | 0x5B8 (2nd sync word) |
| Word #65 | 0x000 (data 0) |
| Word #66 | 0x001 (data 1) |
| ... | ... |
| Word #127 | 0x03E (data 63) |
| Word #128 | 0xA47 (3rd sync word) |
| Word #129 | 0x000 (data 0) |
| Word #130 | 0x001 (data 1) |
| ... | ... |
| Word #191 | 0x03E (data 63) |
| Word #192 | 0xDB8 (4th sync word) |
| Word #193 | 0x000 (data 0) |
| Word #194 | 0x001 (data 1) |
| ... | ... |
| Word #255 | 0x03E (data 63) |
By using A717 SubFrame At Index in a loop, returned ARINC 717 subframes are:
| Subframe #0 | 12-bit word |
|---|---|
| Word #0 | 0x247 |
| Word #1 | 0x000 |
| Word #2 | 0x001 |
| ... | ... |
| Word #63 | 0x03E |
| Subframe #1 | 12-bit word |
|---|---|
| Word #0 | 0x5B8 |
| Word #1 | 0x000 |
| Word #2 | 0x001 |
| ... | ... |
| Word #63 | 0x03E |
| Subframe #2 | 12-bit word |
|---|---|
| Word #0 | 0xA47 |
| Word #1 | 0x000 |
| Word #2 | 0x001 |
| ... | ... |
| Word #63 | 0x03E |
| Subframe #3 | 12-bit word |
|---|---|
| Word #0 | 0xDB8 |
| Word #1 | 0x000 |
| Word #2 | 0x001 |
| ... | ... |
| Word #63 | 0x03E |
In raw mode:
When subframe size is equal to 1 word, the words output contains the 12-bit word at subFrameIndex.
| Parameters | ||
|---|---|---|
| error in | in | error conditions that occur before entering the function |
| subFrames | in | ARINC 717 subframes received |
| wordCount | in | number of ARINC 717 words received |
| subFrameSize | in | subframe size in number of words |
| subFrameIndex | in | start index of the ARINC 717 subframe to decode. |
| words | out | words contained in an ARINC 717 subframe |
| nextIndex | out | start index for the next ARINC 717 subframe |
| error out | out | error information |
| function return | out | function execution status |
Availability
Available in Multibus VI 1.2 and later.
See Also
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Example
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