Unable to build up serial communication with camera

Hi,

I am using two PCI-1430 frame grabber and two CM-030PMCL-RH from JAI.

I can acquire pictures, but am unable to send serial commands (or receive serial information) such as e.g. the exposure time. The Attribute Tree at the camera file generator is blank (as well as the Camera Attributes at NI MAX), and no respond is received when sending commands through the 'Test Serial Settings' window.

I also can not use the cameras own Control Tool outside NI, as this tells me:

'Unable to use communication port. Make sure that no other programs are connected to this port'.

Attached is the view from the CameraLink Remote System Selector from NI MAX.

I would be very glad for help.

Thanks in advance,

Sam

PS: I am transferring the camera link signal to optical fibre and back, if that could be relevant. Also for this camera there is no original camera file, so I had to create my own one.