Usually things work without termination too, if you only have one or two devices on chain, but better have them in correct way anyway

I don't think either that unitcontrol can mount cd-drives... at least I have mountlists. How unitcontrol could know what filesystem to use etc? Anyhow, it still sounds to me that drive isn't working physically or you're trying damaged or noncompatible discs. Some CD:s just don't like to work on some CD drives

If the drive was posted, maybe it's got damaged somewhere?
I'd try with different drive too.. or drive on other computer. I guess you can find free or cheap SCSI CD-ROM drives somewhere for testing... or HD for overall working of your controller...