We changed the switches from CAM2 to CAM3 and also the cables to be sure, that all cables are working.
I can definitly say the cables are working, the convertes are also working.
We already checked the correct programming, the converter for CAM2 has ID 2 and the converter for CAM3 has ID3.
We tried also CAM5 and CAM7 port.
Always the same result.
The converters have already the latest firmware 7.5.3
SDI Camera control ID is 1 or 2 or 3
SDI Output Level B
HDMI Output (illegal levels (0-255))
Audio Mapping SMPTE standard
We have no further ideas at the moment.