Mortise and multipoint latching assembly

A method of operating a remote latch assembly including a mortise chassis connected between an upper latch device and a lower latch device, wherein the mortise chassis comprises a first transmission connected with the upper latch device via an upper connector, and a second transmission connected with the lower latch device via a lower connector, 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, comprising preventing a second transmission deactuating movement while the first transmission remains in a first transmission actuated position;
• in response to deactuation of the upper latch device, causing the mortise chassis to permit deactuation of the lower latch device, comprising permitting the second transmission deactuating movement in response to a first transmission deactuating movement;
• and
• preventing the second transmission deactuating movement during at least a portion of the first transmission deactuating movement such that the second transmission remains stationary during at least a portion of the first transmission deactuating movement.

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 link 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.