Installing the Plate Reader
To attach the Absorbance Plate Reader to your Flex:
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Use a 2.5 mm hex screwdriver to remove the cover from the deck slot you want to use for the module. Retain the screws. 
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Insert the module into the open deck slot and secure it with the screws you removed in Step 1. 
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Route the USB cable under the deck and attach it to a USB port on the right side of the robot. 
When connected, the Absorbance Plate Reader appears in the Instruments and Modules section on your robot’s device details page in the Opentrons App. It does not require positional calibration after installation. You can use the Absorbance Plate Reader as soon as the robot detects it.