Nematron Pointe Controller - Manual (Page 99)

Pointe Controller User Guide Chapter 4: System Design and Installation
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4.8.2 Installing Modules
Each slot has card guides along each side and a connector on the motherboard.
To install an I/O module, place the module’s circuitry board in the top and bottom
card guides. (Note that the board will not be tightly retained until it is
approximately 3⁄4 inch into the card guide.)
As you push the module into its mating connector, squeeze the ends together.
This will allow the board latches to travel inside the card cage. When you have
pushed the board into its mating connector and released, the latches should hook
the card cage and keep the module in place.