This article explains how to connect an ECM module to an Elo IDS monitor

Steps for connecting an ECM module to an IDS monitor can be found below.

1. Use a Phillips head screwdriver to remove the ECM docking cover plate on the back of the touchmonitor. 
2. Snap the Computer Module onto the mating connector on the back of the touchmonitor. 
3. Tighten the four screws to secure the Computer Module onto the back of the touchmonitor. Mount the IDS to any VESA compliant wallmount using the extension spacers and screws (included). 

Note: Once the ECM is installed, the ECM can be easily removed for maintenance reasons by loosening the thumbscrews and sliding it out. 

There is a guide in the User's Manual
You can also view a video demonstration