Confused by Alpha 433au and SCSI

I have a BA356 shelf with a DS-BA35X-FB personality module. The personality module has two high density connectors on it, I think they are 68-pin. The pins are too small for me to be able to count them reliably, but the cable has a 68-pin SCSI Wide connector on the other end. The second connector on the personality module is not connected to anything, I do not have a terminator for it and I am unsure if I need one. I have connected this to my 433au which has a Qlogic QLA1040 SCSI adapter in it. I have been unable to locate any documentation for either the personality module or the SCSI adapter. I am having problems getting the SRM to recognise the disks in the shelf. Sometimes it will see no devices at all, not even the CD-ROM connected to the internal SCSI cable. Other times it will see a ton of disks as shown in this partial extract from the console: dka0.0.0.1009.0 DKA0 dka100.1.0.1009.0 DKA100 dka101.1.0.1009.0 DKA101 dka103.1.0.1009.0 DKA103 dka105.1.0.1009.0 DKA105 dka107.1.0.1009.0 DKA107 dka1100.11.0.1009.0 DKA1100 dka1102.11.0.1009.0 DKA1102 Just now I tried with one SBB in slot 0 and I got this: dka400.4.0.1009.0 DKA400 MATSHITA CD-ROM CR-508 XS03 dva0.0.0.0.1 DVA0 ewa0.0.0.3.0 EWA0 00-00-F8-75-BE-63 pka0.7.0.1009.0 PKA0 SCSI Bus ID 7 5.57 pqa0.0.0.4.0 PQA0 PCI EIDE pqb0.0.1.4.0 PQB0 PCI EIDE When I added a second SBB in slot 1 then I got this: waiting for pka0.7.0.1009.0 to poll... waiting for pka0.7.0.1009.0 to poll... waiting for pka0.7.0.1009.0 to poll... dva0.0.0.0.1 DVA0 ewa0.0.0.3.0 EWA0 00-00-F8-75-BE-63 pka0.7.0.1009.0 PKA0 SCSI Bus ID 7 5.57 pqa0.0.0.4.0 PQA0 PCI EIDE pqb0.0.1.4.0 PQB0 PCI EIDE I am not quite sure what is going on, what the jumpers on the personality module do, whether I need to insert a terminator on the second personality module connector, or whether there are some jumpers on the QLA1040 adapter that need to be set, or is there something else I need to do. Anyone have any clues? Thanks Rob