what does NL mean

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Night Latch (NL)= key retracts the latch momentarily to allow entry. When key is removed, the latch will extend and locks the door (momentary unlock). Class Room (Lock/ Unlock)= key unlocks...
The 388 Cylinder Control is required for the NL-OP function on a 33A/35A series exit devices. The 110NL is used on 22 and 98/99 series exit devices not 33/35A series devices.
The E7500 electric mortise lock body supplied on E98/9975 devices require active trims (L, L-BE, TP, TP-BE, K, or K-BE) to retract the latch after the electronic lock body unlocks.
Order the device as 88 NL less trim. The cylinder will be mounted to the face of the door. Use templates 10156 and 40015.
This option is not available as there is no NL cam to directly drive the rods and using a key to lift the heavy stainless, brass or bronze rods would damage the key. 
Recommend to order a new 990NL-R/V or M trim to change from TP/Classroom function to NL/Storeroom function. You will also need to reinstall the NL drive screw back into into the mast...
To change the function from TL to NL on 360L trim, invert the cam on the mortise cylinder.  See attached instruction 360L trim instruction.
To convert a 98TP to a 98L-NL you must purchase the 996L-NL trim and an NL drive screw (090074) to install in the master cam.