Xante ScreenWriter Colour ScreenWriter User Manual page 315

3. Locate and, if necessary, open metal coupler 2 (fig. 10.2).
If you are installing two LFUs, make sure the couplers on both
units are open. Hold one unit over the other making sure the
alignment posts on the bottom one fit in the corresponding
openings in the top unit. Then lower the top unit into place
(fig. 10.3).
Alignment Posts
Fig. 10.3 Mounting Two LFUs
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Fig. 10.2 Open the Coupler
Front
Back
Alignment Posts
Coupler 2
LF Cable
LFU Cable
Options 10-5