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Example Protocol Packets
Packet
Operation
Length
trigger instantaneous
auto focus on camera 4
turn on OIS on all
cameras
set exposure to 10 ms on
camera 4 (10 ms = 10000
us = 0x00002710)
add 15% to zebra level
(15 % = 0.15 f = 0x0133 fp)
select 1080p 23.98
mode on all cameras
subtract 0.3 from gamma
adjust for green & blue
(-0.3 ~= 0xfd9a fp)
all operations combined
Blackmagic Tally Control Protocol
Version 1.0 (30/04/14)
This section is for third party developers or anybody who may wish to add support for the
Blackmagic Tally Control Protocol to their products or system. It describes the protocol for
sending tally information embedded in the non-active picture region of a digital video stream.
Data Flow
A master device such as a broadcast switcher embeds tally information into its program feed
which is broadcast to a number of slave devices such as cameras or camera controllers. The
output from the slave devices is typically fed back to the master device, but may also be sent to
a video monitor.
The primary flow of tally information is from the master device to the slaves. Each slave device
may use its device id to extract and display the relevant tally information.
0
1
2
3
header
8
4
4
0
0
12
255
5
0
0
12
4
8
0
0
12
4
6
0
0
16
255
9
0
0
16
4
12
0
0
4
4
0
0
1
0
0
0
76
4
6
0
0
1
0
1
0
8
1
128
1
Byte
4
5
6
7
8
command
data
0
1
0
0
0
6
0
0
1
1
5
3
0
0x10 0x27 0x00 0x00
4
2
128
1
0x33 0x01
1
0
1
0
24
8
1
128
1
0
0
1
0
0
255
4
8
0
0
1
4
2
128
1
0x33 0x01
24
1
3
0
0
0
0
0x9a 0xfd 0x9a 0xfd
Información para desarrolladores
9
10
11
12
13
14
0
0
0
0
0
1
3
0
0
0
0
0
0x9a 0xfd 0x9a 0xfd
0
5
0
0
0
6
0
5
3
0
0x10 0x27 0x00 0x00
0
0
255
9
0
0
0
0
4
12
0
0
0
15
0
0
0
0
0
1440
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