QHYCCD QHY268PRO M User manual

Overview
QHY268 Pro M has SONY IMX571 APS-C format CMOS sensor inside. 26mega pixels, Back-illuminated, native 16BIT ADC. QE
is up to 91% and readout noise is as low as 1.1e Even with a 3.76um pixel size, it has a big full-well up to 75ke. It has extremely
low thermal noise 0.0005e/pixel/sec @ -20C, ZERO amplifier-glow performance, It has a maximum frame rate of
6.8FPS@16bit full resolution.
QHY268PRO-M has only monochrome version. QHYCCD also supplies its liquid-cooling version, which is a customized type
and needs to be pre-ordered).
Native 16 bit A/D: The new Sony sensor has native 16-bit A/D on-chip. The output is real 16-bits with 65536 levels.
Compared to 12-bit and 14-bit A/D, a 16-bit A/D yields higher sample resolution and the system gain will be less than 1e-
/ADU with no sample error noise and very low read noise.
BSI: One benefit of the back-illuminated CMOS structure is improved full well capacity. This is particularly helpful for sensors
with small pixels. In a typical front-illuminated sensor, photons from the target entering the photosensitive layer of the
sensor must first pass through the metal wiring that is embedded just above the photosensitive layer. The wiring structure
reflects some of the photons and reduces the efficiency of the sensor. In the back- illuminated sensor the light is allowed to
enter the photosensitive surface from the reverse side. In this case the sensor’s embedded wiring structure is below the
photosensitive layer. As a result, more incoming photons strike the photosensitive layer and more electrons are generated
and captured in the pixel well. This ratio of photon to electron production is called quantum efficiency. The higher the
quantum efficiency the more efficient the sensor is at converting photons to electrons and hence the more sensitive the
sensor is to capturing an image of something dim.
Zero Amplify Glow: This is also a zero amplifer glow camera.
TRUE RAW Data: In the DSLR implementation there is a RAW image output, but typically it is not completely RAW. Some
evidence of noise reduction and hot pixel removal is still visible on close inspection. This can have a negative effect on the
image for astronomy such as the “star eater” effect. However, QHY Cameras offer TRUE RAW IMAGE OUTPUT and produces
an image comprised of the original signal only, thereby maintaining the maximum flexibility for post-acquisition
astronomical image processing programs and other scientific imaging applications.
Anti-Dew Technology: Based on almost 20-year cooled camera design experience, The QHY cooled camera has implemented
the fully dew control solutions. The optic window has built-in dew heater and the chamber is protected from internal
humidity condensation. An electric heating board for the chamber window can prevent the formation of dew and the sensor
itself is kept dry with our silicon gel tube socket design for control of humidity within the sensor chamber.
Cooling: In addition to dual stage TE cooling, QHYCCD implements proprietary technology in hardware to control the dark
current noise.
Interfaces
2*10g

The product has a built-in 2*10Gbps fiber socket. It can work with the QHYCCD PCIE2.0x8 data grabber card. The fiber
interface is for the requirement of the professional obs. It will give the following advantages than the USB3.0 interface. Then
what is the benefit of the Fiber Interface?
Higher data rate. One 10Gigabit Fiber can transfer maximum 10Gbps data. The actual data rate can get about
800MBytes/s. While the USB3.0 is 5Gbps and the actual data rate is about 350MByte/sec. Use the two 10Gigabit fiber
can get about 1.6GBytes/s speed. The IMX455 sensor has the high-speed mode like the 10FPS 14bit full resolution mode
and 30FPS 8K VIDEO mode. The data rate of these modes is much more than USB3.0.
Very long transfer distance. The fiber is hundreds of times longer than USB3.0. USB3.0 can only transfer 3meter to
5meter. For longer distances, it needs the extender cable but can just get 10meter to 15meter. While the Fiber can
transfer 300meter directly by default optic module; with the long-distance optic module, it can transfer up to 40km.
Solid stable and no affected by EMI. One major factor that causes the camera to hang is the EMI issue. The USB3.0
transfer maybe gets effect by the EMI in the transfer patch. Like the static and other high-power device emitted. The
EMI will cause the transfer data packet to get a CRC error and cause the image loss. A long USB cable is easier to get this
problem. Light can not be affected by the EMI. So with the fiber transfer, it will get everything very stable.
USB3.0
USB3.0 is a very popular interface and very easy to use. USB3.0 can not support a transfer distance of more than 3meter. If
you want to get a long-distance under USB3.0, QHYCCD supplies the optional 5meter and 10meter USB3.0 extender cable
with a built-in amplifier.
GPIO
There is a 6pin GPIO socket on the camera backside. It can be configured into different modes, or customized as the user
requests to meeting more complex timing by re-programming the FPGA.
Specifications
Model QHY268PRO M
COMS Sensor SONY IMX571 M
Mono/Color Mono Only
FSI/BSI BSI
Pixel Size 3.76um x 3.76um

Effective Pixel Area 6280*4210 (includes the optically black area and
overscan area)
Effective Pixels 26MP
Sensor Size APS-C
A/D Sample Depth Native 16-bit (0-65535 greyscale) A/D
Full Well Capacity (1×1, 2×2,
3×3)
51ke-
75ke- or above in extended full well mode
Full Frame Rate
USB3.0 Port:
Full Resolution 6.8FPS@8BIT 6FPS @16BIT
2048lines13.6FPS@8BIT 11.5FPS@16BIT
1080lines25.4FPS@8BIT 19.5FPS@16BIT
768lines35FPS@8BIT 25FPS@16BIT
480lines50FPS@8BIT 34FPS@16BIT
Readout Noise
1.1e- High Gain,
3.5e- Low Gain
(5.3e- to 7.4e- in extended full well mode)
Dark Current
-20C0.0005e /pixel/sec
-10C0.001e /pixel/sec
Exposure Time Range 30us-3600sec
Unity Gain*
0*PH Mode
30Extended Fullwell Mode
*With the improvement of the CMOS
technology, the 16bit CMOS camera has been
released, like QHY600/268/411/461. For these
cameras, even in lowest gain it has beyond the
requirement of unit gain (less than 1e/ADU due
to sufficient samples) So you can directly set
gain0 as start. Please note
QHY600/268C/411/461 has extend full well
mode. In this mode you still need to find out the
unit gain position.
Amp Control Zero Amplifer Glow
Firmware/FPGA remote
Upgrade Fully support via Camera USB port
Shutter Type Electronic Shutter
Computer Interface USB3.0 and 2*10Gbps Fiber interface
Built-in Image Buffer 2Gbyte DDR3 Memory

Cooling System
Two-stage TEC cooler
Air Cooling Version
Typical -30C below ambient in short exposure
time (exposure time < 10sec)
Typical -35C below ambient in long exposure
time (exposure time > 30sec)
Test temperature +20°
Water Cooling Version
Typical -45C below ambient in long exposure
time (exposure time > 30sec)
Recommended flow rates for
water-cooled versions 1.6ml/s
Optic Window Type AR+AR High Quality Multi-Layer Anti-Reflection
Coating
Anti-Dew Heater Yes
Humidity Sensor* Yes
Telescope Interface Support M54 and M48 (with standard adapters )
Back Focal Length
QHY268M: 14.5mm*
*If used with the QHY filter wheel, the actual
“BFL Comsumed” is 12.5mm. Note 14.5mm rear
intercept does not include adapter thread,
which must be used with adapters if you need a
M54 thread.
Curves
Multiple Readout Modes is a new function for newer QHY Cameras. Different readout modes have different driver timing,
etc., and result in different performance. The QHY268 currently has four readout modes, and more modes will be added in
the future. These readout modes are currently supported in the QHY ASCOM Camera Driver, SharpCAP software and the
N.I.N.A software.
Readout Mode #0 (Photographic Mode). In this mode there is a drop in the noise between Gain 25 and Gain 26. We
recommend setting the Gain to 26 to begin. At this setting the full well is 27ke- and readout noise is 2.7e-. For every long
exposures you can lower the gain from this point to increase the full well capacity.
Readout Mode #1 (High Gain Mode). Please note there is a HGC/LGC switch point at gain55 to gain56. Gain0-55 uses LGC
and Gain55-100 uses HGC.
Readout Mode #2 (Extended Fullwell Mode).
Now QHY268 adds #3 mode Extend Fullwell 2CMSIT (yellow curve). The advantage of this mode is that it has the same full
well value and system gain as the #2 mode Extend Fullwell, but the read noise is reduced by about 1.3 times.
This function needs to be used with 2020.6.26 or newer SDK. If your software cannot display this mode, please download the
QHYAllInOne installation package to update the SDK in the software.

Monochrom’s Spectrum Response Curve. The curve is based on SONY’s datasheet. In the datasheet, it is the normalized
curve QHYCCD test it by comparing with an known QE CCD sensor. And get this curve. This curve is only a reference.
QHYCCD does not guarantee this curve is correct.
Color version (Normalized Response Curve from SONY datasheet).

Mechanical Drawing
TBA
User Guide
Before Start: Install "All-In-One" Pack
All-In-One Pack Driver, SDK and Software) for WINDOWS supports all QHYCCD USB3.0 devices only except PoleMaster and
some discontinued CCD cameras. Please go to https://www.qhyccd.com/download/ and install it.
Note:
Since most of the contents of All-in-one package are plug-ins that support third-party software, the third-party
capturing software that you want to use must be installed before the All-in-one package. Otherwise the program will
report an error.
ALL-IN-ONE Pack contains:
System Driver, which is necessary for camera operation and must be installed.
WDM Broadcast Driver, which can provide a live signal to Obs and other live software, you can install it if you
have such needs like opeing a live show.
EZCAP_QT , which is developed by QHYCCD and can be used in QHY devices tests, and management of updates.
So even if you won’t use EZCAP_QT for capturing, we suggest you install it.
Ascom driver needs to be sync with the ascom platform version you installed (the latest version of Ascom is 6.5)
The two sorts of Ascom CFW Drivers correspond to two methods of controling the filter wheel: USB control and
camera serial control. It is recommended that both drivers should be installed if you have a filter wheel.
CP210X_VCP is a serial driver. Some computers come with the driver, but the computer without the driver may be
failed of controling the filter wheel.
SDKs for Third-party Software: Just pick and install the corresponding SDK according to the software you want to
use. Don’t forget to check whether the software you are using is 32-bit or 64-bit and select the right SDKs.
SHARPCAP is also included in the pack, you can choose 32-bit or 64-bit to install. This is authorized by
SHARPCAP.
QT LIB is a plug-in to ensure that 64-bit software can exeuate normally on some computers with poor
compatibility.
Difference between Stable version and Beta Version: Beta version is the latest version, which gives priority to support
for the latest products (the stable version may not be compatible with those yet), and has some of the latest optimized
,but experimental features. The stable version is older than the beta version but more stable, so it is recommended for
beginners who are not using the latest products.
Don’t let the camera connect to the computer during the All-in-one pack installation process; connect it to the
computer after all the installation is complete.
Input Voltage Requirements
The camera requires an input voltage between 11V and 13.8V. If the input voltage is too low the camera will stop functioning
or it may reboot when the TEC power percent is high, causing a drain on the power. Therefore, please make sure the input
voltage arrived to the camera is adequate. 12V is the best but please note that a 12V cable that is very long or a cable with
small conductor wire may exhibit enough resistance to cause a voltage drop between the power supply and the camera. The
formular is: V(drop) = I * R (cable). It is advised that a very long 12V power cable not be used. It is better to place the 12V AC
adapter closer to the camera.
First connect the 12V power supply, then connect the camera to your computer via the USB3.0 cable. Make sure the camera is
plugged in before connecting the camera to the computer, otherwise the camera will not be recognized. When you connect
the camera for the first time, the system discovers the new device and looks for drivers for it. You can skip the online search
step by clicking “Skip obtaining the driver software from Windows Update” and the computer will automatically find the
driver locally and install it. If we take the 5IIISeries driver as an example (shown below), after the driver software is
successfully installed, you will see QHY5IIISeries_IO in the device manager.
Please note that the input voltage cannot be lower than 11.5v, otherwise the device will be unable to work normally.
Connect Software
Before using software, make sure you have connected the cooling camera to the 12V power supply and connected it to the
computer with a USB3.0 data cable. If it’s a planetary/guiding camera, 12V power is not needed.
Note: We recommend 64-bit Software if possible, like SharpCAP x64 , N.I.N.A x64. etc., especially when you’re using 16bit
cameras like QHY600.

EZCAP_QT
EZCAP_QT is software developed by QHYCCD. This software has basic capture functions for QHYCCD deep sky cameras.
Run EZCAP_QT. Click “Connect” in Menu -> Camera. If the camera is successfully connected, the title line of EZCAP_QT will
display the camera firmware version and the camera ID as shown below.
Click “Temperature Control” in “Camera Settings” to set the temperature of the CMOS sensor. You can turn on “Auto” to set
the target temperature. For example, here we set the target temperature to -10C. The temperature of the CMOS sensor will
drop quickly to this temperature (approximately 2-3 minutes). If you want to turn off cooling, you can choose Stop. If you just
want to set the TEC power but not the temperature. You can select “Manual” and then set the percentage of the TEC power.
You can use the “preview tab” to preview and use the focus tool to focus. Then use the “capture tab” to capture the image.
SharpCap
Launch SharpCap. If the software and drivers mentioned above are installed successfully, the video image will appear
automatically about 3 seconds after the software loads. You will also see the frame rate in the lower left corner of the software
window as shown below.

If you have already started the SharpCap software before connecting the camera, in order to open the camera, click on the
“camera” in the menu bar and then select the device.
Offset adjustment. When you completely block the camera (i.e., like taking a dark frame) you may find that the image is not
really zero. Sometimes this will reduce the quality of the image contrast. You can get a better dark field by adjusting the offset.
You can confirm this by opening the histogram as indicated in the figure below.
If you want to enter the 16-bit image mode, select the “RAW16” mode.
By selecting the “LX” mode you can expand the exposure setting range and take long exposures.
After cooling devices connected to the 12V power supply, the temperature control circuit will be activated. You can control
the CMOS temperature by adjusting the settings in the figure below. Basically, you can control the temperature of CMOS by
either adjusting “Cooler Power” or clicking “Auto” and setting “Target Temperature”. You can also see the CMOS
temperature at the lower-left corner of the software window.
ASCOM supported software (e.g. MDL)
With ASCOM drivers, you can use the device with many software packages that support the ASCOM standard. We will use
Maxim DL below as an example, but a similar procedure is used for The SkyX and other software packages supporting
ASCOM.
First make sure you have not only loaded the ASCOM drivers but that you have also downloaded and installed the ASCOM
platform from ASCOM. After both the drivers and platform are installed, start MAXIMDL. Follow the instructions shown
below to finish the setup. Then Click Connect in and enter the software.

N.I.N.A
Open N.I.N.A. – Nighttime Imaging ‘N’ Astronomy. Drive connections via ASCOM.

Turn on the TE cooler to set temperature. Then set the exposure time to capture the image.
BroadCast WDM Camera Driver
QHYCCD BroadCast WDM Camera is a broadcast driver that supports QHYCCD cameras with video broadcast function,
which can meet the needs of customers to send video images to other target software. For example, use sharpcap to connect a
WDM-enabled camera, and the sharpcap display video image can be sent to other WDM-supported software for display,
which is suitable for video online broadcast applications.
Installation:
Perform the AllInOne installation and check the BroadCast WDM Camera option.

The installation process is over, right-click the computer to find the device manager, and check that the image device name is
QHYCCD BroadCast WDM Camera, which means the installation is successful.
Activate the function:
Usually sharpcap is used to connect the camera as the broadcasting terminal. After connecting the camera, you need to turn
on the Enable Live Broadcast switch to broadcast.

Common supporting software (ie, broadcast receiver) includes: UFOCAPTURE, HANDYAVI, QQ video functions, etc.
AMcap test effect chart:
HANDYAVI test effect chart:
UFOCAPTURE test renderings:

Precautions:
Currently only supports Windows system.
Currently, the SDK does not support 16 bits for the time being.
RGB24 mode must be selected for color images, otherwise the image will appear gridded.
Advanced Control Tools
Click to download 2021.1.2
Debug TOOL
Release TOOL
Run Sharpcap and make sure the QHY Camera works well under it. You will see the continous image appears.

Click “connect” button and it will show camera name and series number.
select QHY Camera tabl.
check on the “Enable TrigOut” Input 2 to the textbox near to the “GPIO PORT MODE”. Then click the “GPIO PORT MODE”
Button to set the GPIO working mode.

Check the waveform output from the TrigPort.
The introduction of different GPIO PORT MODE
MODE0: Generic GPIO output mode / Auto Guide Port
In this mode. Four GPIO port is all output . You can control each port to output high or output low with the API. This mode
does not controlled by Enable TrigOut.
You can select the check box of MODE0, GPIO1,GPIO2,GPIO3,GPIO4 to test this mode. This mode is also been used to test if
the socket io port working well.
MODE1: 6PIN QHY-GPSBOX mode
In this mode, Four GPIO port is configed as gps_clock, gps_data, shuttermeassure,gps_control. You can connect with
QHYCCD-GPSBOX. The camera will output the shuttermeassure signal to GPSBOX and GPSBOX will send the data to camera.
Camera will replace the first some pixel to the gps data .
MODE2: 5PIN Generic TrigOut / TrigIn mode
In this mode, Four GPIO port is configed as TrigOut, ShutterMeassure, TrigIn, LinePeriod . Only TrigIn pin is input direction
and other three pin is output direction.
In some camera, like QHY4040,QHY2020,QHY42PRO,QHY6060, The shuttermeassure waveform rising edge is the start
exposure time and falling edge is the end exposure time  in other camera like QHY600,QHY268, QHY411,QHY461 etc, The
shuttermeassure waveform is the vsync signal . It is near to the end of exposure time of the first row. For more information of
TrigOut,LinePeriod. Please see some other document of QHYCCD supplied.

MODE3: 4PIN GPS Card TrigIn mode
In this mode. there is two pin is configured as ouptut . Both of the two pins is the shuttermeassure signal but one of it is
inverted. This is suitbale for some GPS card which need such a “differencial signal”. But please note this is not LVDS signal. It
is still TTL signa,
MODE4: Multi-Camera Master Mode
TO BE ADDED
MODE5: Multi-Camera Slave Mode
TO BE ADDED
MODE6: LED Calibration Mode
By using the controlled LED pulse, we can calibrate the distance from the TrigOut or ShutterMeassure signal to the real
pixel/row start/end exposure time. To use this mode. You need to connect a LED to one GPIO pin and let the camera capture
the flash that output from the camera. The start time and end time relative with the TrigOut/ShutterMeassure can be set by
APIs. By check if the camera captured this pulse. You will get the delta time of the TrigOut/ShutterMeassure signal and use it
to calibrate the messured GPS time.
mode
0mode 1 mode 2 mode 3 mode 4 mode5 mode6
GPIO1 GPSBOX_Control ShutterMessure+ ShutterMessure+ n.a n.a ShutterMessure+
GPIO2 GPSBOX_Data (IN TrigIn2 ShutterMessure- n.a n.a TrigIn2
GPIO3 GPSBOX_ShutterMessure LinePeriod n.a HSYNC(OUT HSYNCIN) LinePeriod
GPIO4 GPSBOX_CLK TrigOut n.a VSYNC(OUT VSYNC(IN) LED(OUTPUT)
GND GND GND GND GND GND GND
Maintenance
CMOS Maintenance
Drying the camera CMOS chamber
The CMOS sensor is located in the CMOS chamber. There is a hole in the side of the camera near the front plate that is
normally plugged by a screw with an o-ring. If there is moisture in the CMOS chamber that causes the sensor glass to fog, you
can connect the silica gel tube to this hole for drying the chamber.
Place an effective silica gel desiccant in the silica tube make sure there is some cotton inside to prevent the silica gel from
entering the CMOS chamber.
Cleaning the CMOS sensor and optical window
If you find dust on the CMOS sensor, you can first unscrew the front plate of the cam and then clean the CMOS sensor with a
cleaning kit for SLR camera sensors. Because the CMOS sensor has an AR (or AR/IR) coating, you need to be careful when
cleaning. This coating can scratch easily so you should not use excessive force when cleaning dust from its surface.

Preventing fogging of the CMOS chamber
If the ambient humidity is very high, the optical window of the CMOS chamber may have condensation problems. The
QHY600 has a built-in heating plate to heat it to prevent fogging. In most cases, it is very effective. However, If fogging still
persists, try the following:
1. Avoid directing the camera towards the ground. The density of cold air is greater than the density of hot air. If the camera is
facing down, cold air will be more accessible to the glass, causing it to cool down and fog.
2. Increase the temperature of the CMOS sensor. You can increase the temperature of the CMOS sensor slightly to prevent
fogging of the glass.
3. Check if the heating plate is working. If the heating plate is not working, the glass will be very easy to fog. Normally, the
temperature of the heating plate can reach 65-70 °C in the environment of 25 °C. If it does not reach this heat, it may be
because the heating plate is damaged, you can contact us to replace the heating plate.
TE Cooler Maintenance
You should avoid thermal shock during use. Thermal shock refers to the internal stress that the TE cooler has to withstand
due to the thermal expansion and contraction when the temperature of the TEC suddenly rises or falls. Thermal shock may
shorten the life of the TEC or even damage it.
Therefore, when you start using the TEC to adjust the CMOS temperature, you should gradually increase the TEC power
rather than turning the TEC to maximum power. If the power of the TEC is high before disconnecting the power supply, you
should also gradually reduce the power of the TEC and then disconnect the power supply.
AppendixUVLO Function
Note: Now only QHY600, QHY268, QHY410, QHY411, QHY461, QHY533 cameras have UVLO function.
What is UVLO?
UVLOUnder Voltage Locking), is primarily intended to protect the electronic device from damage caused by abnormally low
voltages.
Our daily life experience tells us that the actual operational voltage of an electrical device must not significantly exceed the
rated voltage, otherwise it will be damaged. For such precision equipment as cameras, long-term work at too low input
voltage can also be detrimental to the working life of the camera, and may even make some devices, such as power manager,
burn up due to long-term overload. In the all-in-one driver and SDK after 2021.10.23 stable version, the camera will give a
warning when the input voltage of the camera is below 11V.
UVLO warning execution
After a warning is given, the camera firmware will automatically turn off the cooler and will turn on the camera’s TEC
protection mode. After the camera is reconnected, it will always work in TEC protection mode (maximum power cooler
power will be limited to 70%). Since many times the voltage shortage is caused by the high resistance of the power supply
cable itself, resulting in a large voltage drop at high currents, the voltage will usually rise after the power is limited. But
limiting the power will affect the cooling temperature difference. Therefore, it is recommended that users first check the
power supply cable to solve the problem of excessive resistance of the power supply cable.
If the user has solved the problem of insufficient supply voltage, the TEC protection mode can be removed through the menu
of EZCAP_QT.

How to improve the power supply?
1. Make sure the output voltage of the AC adapter is not less than 12V and the maximum output current can reach 4A or
more. Otherwise, the AC adapter itself will not meet the power demand of the camera and it may cause a low voltage
problem.
2. Make sure that the 12V power supply cable connecting the AC adapter to the camera has a low impedance. The
impedance of the positive and negative paths should not exceed 0.1 ohms each. Or the total impedance (positive +
negative) should not exceed 0.2 ohms. Otherwise, the power supply cable should be thickened.
3. When using battery power, it is recommended to add a 12V output voltage regulator. If the battery is connected directly,
usually the battery voltage reaches 13.8V when fully charged, and will gradually drop during use. It is easy to cause the
camera to reach the low-voltage detection threshold.
How to clear the TEC protection status triggered by UVLO?
Once a UVLO event occurs, the camera will automatically memorize it and will work in a protected mode at a maximum of
70% power after reconnection. This memory can be erased as follows:
After you find the system error, you need to turn off the device and check the power supply. After inspecting the problem,
open the ezcap software and select “Camera Settings” – “Preferences” – “Reset Flash Code” to reset the error status.
Why does the warning appear even though the power supply voltage is 12 V?
1. The voltage measured inside the camera is the voltage reaching the camera, not the voltage at the power adapter end.
Therefore, the voltage measured at the power adapter end does not reflect the voltage received at the camera end. This
is because the power cable has its own resistance. If the resistance is large, it will cause a large voltage drop. The voltage
drop can be calculated by U = I * R. So if the power cable has a resistance of 0.2 ohms, it will produce a voltage drop of
3.3 * 0.2 = 0.66V. If the power adapter output is 12 V, the voltage reaching the camera is 12 – 0.66 = 11.34 V. To actually
measure the input voltage at the camera end, you can refer to the photo below.

2. For cameras produced after September 2021, the UVLO is detected by communicating directly with the power manager,
and the UVLO code that appears is 9, while for cameras produced before, the indirect detection method is used, and the
UVLO code that appears is 3. The indirect detection method will detect UVLO except for the low voltage problem, and
any other accident that causes CMOS not to work will also trigger the UVLO=3 alarm, for example, the camera is subject
to severe electromagnetic interference, causing registers inside the CMOS not to work. Therefore, if UVLO=3 occurs, it is
recommended to contact QHYCCD technical support for further judgment.
3. Using older versions of drivers and firmware may cause false positives (UVLO=9). Please make sure that ALL-in-one
SDK version is out of stable version 2021.10.23 or higher. Please disconnect the 12V power supply during the driver
installation.
QHYCCD BURST Mode
QHYCCD BURST Mode
Added functions related to BURST mode in SDK. Currently, cameras that support Burst function include QHY600, QHY411,
QHY461, QHY268, QHY6060, QHY4040, QHY4040PRO, QHY2020, QHY42PRO, QHY183A
This mode is a sub-mode of continuous mode. This function can only be used in continuous mode. When this function is
enabled, the camera will stop outputting image data, and the software frame rate will be reduced to 0. At this time, send
relevant commands to the camera, and the camera will Output the image data with the specified frame number according to
the settings, for example, set Start End to 1 6, the camera will output the image data with the frame number 2 3 4 5 when
receiving the command.
Note:
1. When using Burst mode in fiber mode, the first Burst shot will be one less. For example, if the start end is set to 1 6, the
output of 2 3 4 5 is normal, but in fact, only 3 4 will be output during the first burst shot. 5, 2 will not be received, the second
and subsequent shots can normally obtain Burst images 2 3 4 5. This problem will be fixed later.
2. QHY2020, QHY4040 found that the frame number that came out when the exposure time was short is [start+1,end-1] but
the one that came out under long exposure was [start+2,end]
3. When the camera is just connected, if the set end value is relatively large, the camera will directly output the picture after
entering the burst mode. Therefore, it is necessary to set the camera to enter the IDLE state and then set the start end and
related burst operations.
The following is the usage of Burst mode related functions:
1.EnableQHYCCDBurstMode