Blackmagicdesign Design 3G-SDI Arduino Shield, Installation And Operation Manual, Page: 194 / 253

192 Developmer Information
Register: OCARM (Output Control Arm)
[ RESERVED ] [ ARM ]
7 1 0
**Reserved:** Always zero.
**Arm:** When 1, the outgoing control is data armed and will be sent in
the next video frame. Automatically cleared once the control has
been sent.
Register: OCLENGTH (Output Control Length)
[ LENGTH ]
7 0
**Length:** Length in bytes of the data to send in OCDATA.
Register: OCDATA (Output Control Payload Data)
[ CONTROL DATA ]
255*8-1 0
**Control Data:** Control data that should be embedded into a future video frame.
Register: ICARM (Incoming Control Arm)
[ RESERVED ] [ ARM ]
7 1 0
**Reserved:** Always zero.
**Arm:** When 1, incoming control data is armed and will be received in
the next video frame. Automatically cleared once a control
packet has been read.
Register: ICLENGTH (Incoming Control Length)
[ LENGTH ]
7 0
**Length:** Length in bytes of the data in _ICDATA_. Automatically set when
a new packet has been cached.
Register: ICDATA (Incoming Control Payload Data)
[ CONTROL DATA ]
255*8-1 0
**Control Data:** Last control data extracted from a video frame since _ICARM.
ARM_ was reset.
Register: OTARM (Output Tally Arm)
[ RESERVED ] [ ARM ]
7 1 0
**Reserved:** Always zero.
**Arm:** When 1, the outgoing tally data is armed and will be continuously
from the next video frame until new data is set. Automatically
cleared once the tally has been sent in at least one frame.
Register: OTLENGTH (Output Tally Length)
[ LENGTH ]
7 0
**Length:** Length in bytes of the data to send in OTDATA.