Mortise and multipoint latching assembly

A system, comprising:

• an upper latch device;
• a lower latch device;
• a mortise chassis positioned between the upper latch device and the lower latch device, the mortise chassis comprising an actuation assembly, wherein the mortise chassis is operable to actuate the upper latch device via an upper connector, and wherein the mortise chassis is operable to actuate the lower latch device via a lower connector;
• wherein the mortise chassis is configured to actuate each of the upper latch device and the lower latch device in response to actuation of the actuation assembly, and to maintain actuation of the lower latch device until deactuation of the upper latch device.

A method of operating a remote latch assembly including a mortise chassis connected between an upper latch device and a lower latch device, the method comprising:

• in response to actuation of a manual actuator, causing the mortise chassis to actuate each of the upper latch device and the lower latch device;
• while the upper latch device remains actuated, causing the mortise chassis to maintain actuation of the lower latch device;
• and
• in response to deactuation of the upper latch device, causing the mortise chassis to permit deactuation of the lower latch device.

A mortise chassis configured for mounting within a mortise cutout of a door, the mortise chassis comprising:

• an upper transmission comprising an upper spool and an upper cable wound about the upper spool, wherein the upper transmission has a first actuated position and a first deactuated position;
• a lower transmission comprising a lower spool and a lower cable wound about the lower spool, wherein the lower transmission has a second actuated position and a second deactuated position;
• an actuation assembly operable to actuate each of the upper transmission and the lower transmission;
• and
• a hold-open linking operable to engage each of the upper transmission and the lower transmission, the hold-open link having a hold position and a release position;
• wherein the hold-open link in the hold position retains the lower transmission in the second actuated position;
• wherein the hold-open link in the release position permits the lower transmission to move from the second actuated position to the second deactuated position;
• wherein the upper transmission is configured to retain the hold-open link in the hold position while the upper transmission is in the first actuated position;
• and
• wherein the hold-open link is configured to move from the hold position to the release position in response to movement of the upper transmission to the first deactuated position.