Asus AP1720-E2 - Manual (Page 58)

Chapter 2: Hardware setup 2-38
Non-Cascade configuration
First backplane (BPB1)
J1 setting (1-3 shorted, 2-4 shorted)
Device SCSI ID#
Drive Bay 1 ID0
Drive Bay 2 ID1
Drive Bay 3 ID2
Drive Bay 4 ID3
GEM 318 SAF-TE ID15 (SCSI channel-0)
Second backplane (BPB2)
J1 setting (1-3 shorted, 2-4 shorted)
Device SCSI ID#
Drive Bay 5 ID0
Drive Bay 6 ID1
Drive Bay 7 ID2
Drive Bay 8 ID3
GEM 318 SAF-TE ID15 (SCSI channel-1)
In a non-cascade configuration, you must install a SCSI multi-mode
terminator on both backplanes.