Acer PCI to Ultra SCSI RAID Controllers DAC960PG - Manual (Page 36)

Installation
A-4 DAC960PG and DAC960PJ Installation Guide
Figure A-3. Installing the BBU
5. Install the BBU so that J1 on the BBU connects to J5 on the
DAC960PG or DAC960PJ. Pin 1 on the BBU’s J1 must connect to hole
1 on the DAC960PG and DAC960PJ’s J5. The mounting holes on the
BBU will line up with the mounting holes on the DAC960PG or
DAC960PJ if the connectors are plugged in correctly.
6. Be sure the four standoffs line up with the four holes in the DAC960PG
or DAC960PJ. Place a nylon screw through a hole from the back of the
DAC960PG or DAC960PJ into a standoff, and turn the screw to the
right until it is snug (not too tight). Repeat this step with the remaining
three standoff screws.