Grass Valley Maestro Master Control Reference Manual v.2.4.0 - Manual (Page 159)

MAESTRO — Automation Interface Protocol Technical Reference Manual 159
MAESTRO_TEXT_CRAWL_CONTENT_STATUS
MAESTRO_TEXT_CRAWL_CONTENT_STATUS
(Query the status of a Crawl on a Keyer)
Hex definition Mnemonic
0x85 MAESTRO_TEXT_CRAWL_CONTENT_STATUS
Command format:
N/A
Command notes:
The following notes pertain to the parameter:
1. Bit 0 indicates whether a crawl is assigned to the specified . A keyer that does not have a crawl assigned (Bit 0
= 0) will always indicate Not Playing (Bit 1 = 0) and No Text Buffer Available (Bit 2 = 0).
2. Bit 1 indicates whether the crawl is playing. A crawl that is not playing (Bit 1 = 0) will always indicate that a text buf-
fer is available. This allows immediate replacement of crawl text on a stopped crawl.
3. If a crawl is playing (Bit 1 = 1), Bit 2 will indicate if a text buffer is available (Bit 2 = 1) or not (Bit 2 = 0). The text buf-
fers can be viewed as a double buffer where the crawl plays one buffer while the other can be filled. If the second buffer
contains text when the crawl reaches the end of the first, it will switch to rendering the second buffer freeing up the first.
If the second buffer does not contain text when the crawl reaches the end of the first, it will continue to loop on the first
buffer checking for text in the second buffer each time it reaches the end of the first.
Query format:
READ MAESTRO_TEXT_CRAWL_CONTENT_STATUS
Reply format:
IFRE MAESTRO_TEXT_CRAWL_CONTENT_STATUS
Use applicable with UPDATE:
No
Argument definitions:
= 0-7
= 1 byte (Most Significant Bit first)
Bit 0 = Crawl is Assigned
Bit 1 = Playing
Bit 2 = Text Buffer Available