It's not a real SCSI conector, Apple just used that connector as it's reliable for hot swapping. the drive wont be detected in a real SCSI device. These Caddies are also for Xserve RAIDs which are 100% IDE and have no SCSi controllers at all.
It's just a pass-through, same applies to the Fibre-Channel connector used in the SATA based G5 and Intel versions of the caddies.