QHYCCD QHY CFW1 - Manual (Page 4)

4) Using the filter wheel
First you need to connect the RS-232 cable, then apply power.
Connect to the filterwheel using your prefered imaging software.
For instance, lets assume you have Maxim DL V5.xx.
Start Maxim and select your camera as normal, but you will now be able to select your filter wheel.
Simply click on the “Setup Filter” box and select “Ascom” as the filter wheel.
Then click on the “Advanced” box in the bottom left and select “QHY 2”FW(RS232)” from the drop down
menu.
Next select the coms port the filter wheel is attached too.
Or if you have a QHY-9 camera, and using the QHY-9 direct mini serial cable, then select
“QHY9FWFilterWheel”.
NOTE : Make sure you are using the QHY-9 Ascom camera driver when using the filter wheel
in “Direct” (Using the QHY-9 serial cable) connection, otherwise the program will hang.
Simply select Ascom in the CCD camera menu.
Select the camera, and also select your Gain and Offset
Found in the “Properties” menu.