Dn-60 - vicious circle
 

I have a camera SONY HVR-Z5E and a datavideo DN-60.
When I have a DV cassette in the camera and I press a red button for recording on the camera, recording is processing smoothly also to the DN-60 at the same time.
However, when a cassette is not inserted in the camera, while the DN-60 is connected, then after a red button for recording on the camera is pressed, the camera displays, that a cassette is not inserted in the camera, and therefore recording to the DN-60 is not possible.
Setting of the DN-60 (from "SYNC- TO TAPE TO "OFF" to "SYNC- TO TAPE TO "ON" and so on)
NO WORKS !!!.
I asked the SONY company, but they knew nothing about this. They said, that their Sony HVR-MRC1 on a camera worked, and invited me to buy this Sony HVR-MRC1, and it would certainly work.
At DATAVIDEO said, that it should work.
Am I really such a fool, that I am not able to set it to work?
Is there anyone who would be able to write me down by steps,
which settings are needed to set the DN-60 and the camera SONY HVR-Z5E?
Or you just tell me, that this is not possible, forget it.
And I will forget and not think about this anymore.

Thanks in advance for your help!
Best regards,
Pino P.