- HP Hood LLC Projector User Manual

8 RS-232 protocol reference
The following table illustrates the types of notifications that can result if a request uses
incorrect syntax.
This incorrect syntax... Generates this type of notification
No asterisk at start of request None:
Request: PMOD=1<CR>
Notification:
Unrecognized keyword None:
Request: *BTR=65<CR>
Notification:
Invalid parameter Echoes the request keyword with the current
value:
Request: *BRT=–65<CR>
Notification: *BRT=10<CR><LF>
Specifies an action with an
unnecessary parameter
Ignores the parameter, executes the request
keyword, and echoes the keyword:
Request: *SYNC=65<CR>
Notification: *SYNC<CR><LF>
Requests a valid setting that is
unavailable (for example, due to
lack of an input source, or to the
setting not being supported for the
input source)
Echoes the request keyword, with a question
mark instead of a value:
Request: *CSPC=0<CR>
Notification: *CSPC=?<CR><LF>
Attempts to increment/decrement a
setting past its defined limits.
Ignores the request, and echoes the keyword
with the current value for the setting. For
example, if BRT is set to 100 (its maximum):
Request: *BRT=+<CR>
Notification: *BRT=100<CR><LF>
Attempts to modify a read-only
setting.
Ignores the request, and echoes the keyword
with the current value for the setting:
Request: *STAT=3<CR>
Notification: *STAT=1<CR><LF>