The Schlage 194555261976 is the L9692EU motorized latch retraction (MLR) chassis with lever control, built-in RX (Request to Exit) switch, and built-in LX (Latchbolt Monitor) switch -three monitoring and control functions integrated into a single Schlage L Series mortise lock body. It is configured for Fail Secure (EU) operation with outside lever control only. The cylinder is not included. This is a less-cylinder chassis requiring a field-installed cylinder at time of installation.

This is the most fully monitored configuration in the L9692EU MLR chassis family. The companion chassis 194555261945 has neither RX nor LX. The chassis 194555261952 has RX only. This chassis (194555261976) carries both RX and LX together, which is the specification required when the access control system must monitor both the exit event and the latch bolt position simultaneously.

What the LX Latchbolt Monitor Adds to This Chassis

The LX switch monitors the physical position of the latch bolt -whether it is extended (door fully closed and latched) or retracted (latch bolt pulled back, door capable of opening). This is a discrete electrical signal that changes state each time the latch bolt moves between positions.

In practice, the LX provides two critical pieces of information the RX alone cannot supply. First, it confirms that the latch bolt has actually retracted when the motor activates -the MLR motor may activate without fully retracting the bolt if the door is binding, out of alignment, or under side load. The LX tells the access control panel whether retraction completed successfully. Second, it confirms that the door has returned to a fully latched state after closing. A door that closes but does not re-latch -common in high-traffic corridors where doors bounce or close too fast -will be flagged by the LX circuit. Without LX, the access control system has no way to distinguish between a properly latched door and one that is physically ajar.

Schlage L9692 Parts: Why RX and LX Belong on the Same Chassis

The RX switch monitors inside lever operation. The LX switch monitors latch bolt position. Together, they cover the complete door cycle from exit initiation to re-latching. RX fires when the inside lever is depressed. LX fires when the latch bolt retracts and again when it re-extends. The access control panel can sequence these two signals to confirm: inside lever operated (RX), latch retracted (LX state 1), door re-closed and re-latched (LX state 2). A gap in that sequence -RX fires but LX never changes, or LX retracts but never re-extends -triggers a prop alarm or alert at the panel.

This is the monitoring architecture required for prop alarm compliance, anti-passback enforcement, and two-way door audit trail requirements. Applications that specify this level of door monitoring include pharmaceutical dispensing points, laboratory and clean room access doors, behavioral health facility secured entries, and data center perimeter doors where the access control policy mandates confirmation of both exit and re-latch on every cycle.

Schlage Retraction Chassis: Full L9692EU Specification With All Switches

The 194555261976 chassis shares the same 24VDC stepper motor platform as all L9692EU MLR variants. It auto-detects 12VDC or 24VDC input with no configuration required. Current draw at holding is 0.010 amps, eliminating lever heat in continuously energized fail secure applications. The EL (Fail Safe) or EU (Fail Secure) operating mode is field selectable via the case-mounted switch, so the mode can be changed without reordering. Binding detection in the motor controller automatically adjusts output force for warped doors, HVAC stack pressure, and side load.

The chassis is UL listed for 3-hour fire door assemblies. A spring-loaded fusible link provides fail secure mode independently in fire events, even if the lock is in fail safe mode, ensuring the door positively latches during fire regardless of electrical configuration. The lock body meets ANSI/BHMA Grade 1. Power supply must be a UL 294/UL 603 listed, Class 2 power-limited source. The Allegion Connect Molex connector is built into the chassis for quick-connect hinge transfer installation; it can be cut and spliced for installations requiring traditional wire connections.

Schlage L Series Mortise Lock: Selecting the Right MLR Chassis

Specifying the correct MLR chassis requires knowing which monitoring outputs the access control panel requires. If no monitoring is needed, the base chassis (194555261945) is correct. If only RX is required (exit event monitoring without latch confirmation), the 194555261952 chassis applies. If both RX and LX are required -full door cycle monitoring -this chassis (194555261976) is the correct specification.