- HP Hood LLC Projector User Manual

RS-232 protocol reference 7
Notifications
In general, every request sent to the projector generates one or more notification
messages, which are sent to the controller. (The exception is unrecognized requests,
which are ignored.) Actions initiated by the projector can also generate notifications.
The projector is always in verbose mode, and sends notifications whenever a setting
changes, whether as the result of a request from a controller, or as the result of an
action such as a button press or menu change. Some requested setting changes take
time to accomplish, or are carried out in stages: because of this, these requests may
produce asynchronous notifications.
A given request may produce more than one notification. An example of this is a
request to change the active input source: the initial request produces a notification
acknowledging the request, and also produces delayed notifications indicating that
related settings were changed. See page 9 for examples.
The following table lists the types of notifications generated in various situations.
This type of request... Generates this type of notification
Modify a setting Echoes the request keyword and shows the
resulting value:
Request: *BRT=65<CR>
Notification: *BRT=65<CR><LF>
Query a setting Echoes the request keyword and shows the
resulting value:
Request: *CON=?<CR>
Notification: *CON=40<CR><LF>
Execute an action Echoes the request keyword:
Request: *NXT<CR>
Notification: *NXT<CR><LF>