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Slave devices pass through the tally packet on their output and update the monitor tally status
so that monitor devices connected to that individual output may display tally status without
knowledge of the device id they are monitoring
Assumptions
Any data alignment
padding is explicit in the protocol
/
Blanking Encoding
One tally control packet may be sent per video frame
packet with DID
SDID x51
/
contain up to 256 bytes of tally information
Packet Format
Each tally status consists of 4 bits of information
uint4
bit 0
:
bit 1
:
bit 2
3
-
:
The first byte of the tally packet contains the monitor device tally status and a version number
Subsequent bytes of the tally packet contain tally status for pairs of slave devices
device sends tally status for the number of devices configured
of 510
.
struct tally
uint8
bit 0
:
bit 1
:
bit 2
3
-
:
bit 4
7
-
:
uint8
0
[
]
bit 0
:
bit 1
:
bit 2
3
-
:
bit 4
:
bit 5
:
bit 6
7
-
:
uint8
1
[
]
bit 0
:
bit 1
:
bit 2
3
-
:
bit 4
:
bit 5
:
bit 6
7
-
:
. . .
.
x52 in the active region of VANC line 15
/
.
:
program tally status
0
off
(
=
preview tally status
0
off
(
=
reserved
0x0
(
)
monitor device program tally status
monitor device preview tally status
reserved
0b00
(
)
protocol version
0b0000
(
slave device 1 program tally status
slave device 1 device preview tally status
reserved
0b00
(
)
slave device 2 program tally status
slave device 2 preview tally status
reserved
0b00
(
)
slave device 3 program tally status
slave device 3 device preview tally status
reserved
0b00
(
)
slave device 4 program tally status
slave device 4 preview tally status
reserved
0b00
(
)
Bit fields are packed from LSB first
.
Packets are encoded as a SMPTE 291M
.
A tally control packet may
.
1
on
,
=
)
1
on
,
=
)
supported
up to a maximum
/
,
0
off
1
on
(
=
,
=
)
0
off
1
on
(
=
,
=
)
)
0
off
1
on
(
=
,
=
)
0
off
1
on
(
=
,
=
0
off
1
on
(
=
,
=
)
0
off
1
on
(
=
,
=
)
0
off
1
on
(
=
,
=
)
0
off
1
(
=
,
=
0
off
1
on
(
=
,
=
)
0
off
1
on
(
=
,
=
)
Developer Information
,
.
.
The master
.
)
on
)
2023
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