Decklink SDK SDI Camera Control - Auto Exposure

I’m trying to use the Decklink SDK on windows using Blackmagic SDI Camera control protocol to change auto exposure camera settings. A sdi cable is connected to sdi out port on Decklink Card and the other end to the SDI in port on BlackMagic micro studio4.

From:
BlackMagic micro studio 4k>menu>Camera>Auto Exposure = Manual Trigger
To:
BlackMagic micro studio 4k>menu>Camera>Auto Exposure = Iris + Shutter

Manuals:
[1] BlackMagicCameraControl.pdf (page 3-11),
[2] ATEM_Switches_Operation_Manual.pdf (page 141-148)

Environment:
Windows
BlackMagic micro studio 4k>menu>Setup>Camera Number = 1
SDI connection: Decklink SDI 4k, sdi out ---------- sdi cable-------- sdi in, Blackmagic micro studio 4k
DeckLink sdk: https://github.com/kdienes/decklink-sdk
Example project: \decklink-sdk-master\Examples\Win\VancOutput.vcxproj
Cpp file: VancOutput.cpp

Modifying VancOutput.cpp
I’m able to set shutter speed from the example in the manual to 1/100 or 1/250:

// 1/100 1/250
// shutter 0x10 0x25
// speed 0x27 0x10
INT8_UNSIGNED shutter = 0x10;
INT8_UNSIGNED speed = 0x27;
const INT8_UNSIGNED kSDIRemoteControlData[12] = { 0x00, 0x08, 0x00, 0x00, 0x01, 0x05, 0x03, 0x00, shutter, speed, 0x00, 0x00 };

When trying to set Auto Exposure to iris + shutter, nothing happens
I'm new to the protocol, so I would be if anyone could help me out. What am I doing wrong here?
// auto exposure
// [destination, length, command, reserved, category, parameter, type, operation mode ]
// [1 5 0 0 1 10 1 0 3]
INT8_UNSIGNED destination = 0x01; // send to all cameras, current test camera setup>Camera number = 1
INT8_UNSIGNED length = 0x05; // number of bytes after reserved, so array length - 4
INT8_UNSIGNED command = 0x00; // not clear, is set to 0x00 assign, 0x01 toggle
INT8_UNSIGNED reserved = 0x00; // reserved should always be 0x00
INT8_UNSIGNED category = 0x01; // autofocus ID = 1.10 category = 0x01, the hole number in ID
INT8_UNSIGNED parameter = 0x10; // autofocus ID = 1.10 parameter is the fraction of ID, parameter = 0x10
INT8_UNSIGNED type = 0x01; // manual says int8, should be signed byte
INT8_UNSIGNED operation = 0x00; // operation 0x00 assign parameter value, 0x01 toggle parabeter value

// data
// auto exposure modes : 0x00 manual trigger, 0x01 = iris, 0x02= shutter, 0x03 = iris + shutter, 0x04 = shutter + irs
INT8_UNSIGNED autoExposureMode = 0x03;

const INT8_UNSIGNED kSDIRemoteControlData[9] = { destination, length, command, reserved, category, parameter, type, operation, autoExposureMode};

[Cameron Nichols]

Hi Einar,

The SDK you are referencing is very old (10.7), can you try using with Desktop Video SDK 10.11.4. I have confirmed that VancOutput to Blackmagic Micro Studio Camera 4K will correctly set auto-exposuse with the following modifications:

const INT8_UNSIGNED kSDIRemoteControlData[9] = { 0x01, 0x05, 0x00, 0x00, 0x01, 0x0a, 0x01, 0x00, 0x00 }; // Set to manual trigger
or
const INT8_UNSIGNED kSDIRemoteControlData[9] = { 0x01, 0x05, 0x00, 0x00, 0x01, 0x0a, 0x01, 0x00, 0x03 }; // Iris + Shutter

Confirmed via menu overlay. Running Desktop Video 10.11.4, Micro Studio Camera 4K v4.7.1.

Regards
Cameron

Hi Cameron

Thank you for helping me out

Decklink SDK(10.7)
Looks as I’ve got the parameter wrong, changing from 0x10 to 0x0a sets auto exposure . I did not realize that we should use hex values.

Desktop Video 10.11.4 (Blackmagic_Decklink_SDK_10.11.4.zip)
I’ve tried to set auto exposure from this version, but the VancOutput example is not able to set auto exposure nor shutter speed (exits with code 1).
Do you I have to upgrade the firmware of our camera?

Regards
Einar