Datex-Ohmeda F-LM1 Technical Reference Manual page 357

Data card hardware is installed on top of the recorder housing.
Figure 3 Installing Data card hardware
Lift the rear of the board before pushing the connector in
Figure 4 Installing the board
Optional N-LDATA Upgrade for Light Monitors, F-LM1 and F-LMP1s
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Document No. 896553-2