Blackmagicdesign Design 3G-SDI Arduino Shield, Инструкция по установке и эксплуатации, Страница: 111 / 253

109 Developer Information
Register: OTDATA (Output Tally Data)
[ TALLY DATA ]
255*8-1 0
**Tally Data:** Tally data that should be embedded into a future video frame (one
byte per camera). Bit zero indicates a Program tally, while bit one
indicates a Preview tally.
Register: ITARM (Input Tally Arm)
[ RESERVED ] [ ARM ]
7 1 0
**Reserved:** Always zero.
**Arm:** When 1, tally data armed and will be received in the next video
frame. Automatically cleared once the tally has been read.
Register: ITLENGTH (Input Tally Length)
[ LENGTH ]
7 0
**Length:** Length in bytes of the data in _ITDATA_. Automatically set when a
new packet has been cached.
Register: ITDATA (Input Tally Data)
[ TALLY DATA ]
255*8-1 0
**Tally Data:** Last tally data extracted from a video frame since _ITARM.ARM_
was reset (one byte per camera). Bit zero indicates a Program tally,
while bit one indicates a Preview tally.