Etc Express 72/144 console

Hi,

I am a lighting technician in puppet Theatre-Bulgaria.
I have the following problem:
The console is express 72/144.
It is plugged in the following device: Dmxking edmx4 Pro.
Port A and B are configured on DMX in and enter two universes from the console.
Port C and D are configured on the DMX output.
In Port C and D are plugged 20 dimmers with 6 channels.
Everything works. When I start using the Аrtnet device, the spotlight starts flashing with a random frequency.
When I turn off the console, everything's fine.
In the settings of the console outgoing settings-There are 4 options DMX speed.
0 = max 1 = Fast 2 = Medium 3 = slow.
Nowhere could I find the speed of the DMX transmission in Hertz.
I can't synchronize the outputs of the console with the Artnet device.
Please, if anyone can help, I would be very grateful.
 
Best regards,
Yanko Yankov