Red Lion LEGEND - Manual (Page 10)

MESSAGES
The Legend Plus features messaging capabilities that can inform the user
of output actions or other events that occur in a system. Up to ten messages
can be programmed. Messages can be requested by an output status change,
User Input(s), or through serial communications.
When a message is requested, the unit checks if there is a message already
on the display. If there are no messages on the display, the requested message
is displayed. A message on the display is replaced if, the requested message
has the same or higher priority. If the unit is not at the main display, the unit
stores one message request. If subsequent messages are requested while not at
the main display, the unit stores the last message requested, or the highest
priority message request. The stored message is redisplayed 2.5 seconds after
the user returns to the main display.
If a message is displayed and the user presses the appropriate key to get to
the Preset, Scaling or Programming menu display, the displayed message is
temporarily suspended. While the message is suspended the message timer, if
used, is also halted. The message is redisplayed 2.5 seconds after the user
returns to the main displays and the message timer resumes. If the Up or Down
arrow key is pressed while in the main display loop, the message is also
suspended, and the appropriate programmed display is shown. The message
is redisplayed 2.5 seconds after the last key press.
USER INPUT MESSAGE REQUEST OPERATION
Individual User Inputs can be programmed to activate any of the ten
messages. The messages can be maintained or momentary. Messages can be
assigned a priority from 1 to 8 (1 is highest). This assures that very important
messages are displayed first.
BINARY MESSAGE REQUEST OPERATION
Two, three or all four of the User Inputs can be configured to request
messages in a binary fashion. Messages 1 through 9 can be requested in this
manner. The binary state 0 (all binary inputs inactive) , is used to indicate no
message requested. During the scanning of the binary message request
inputs, if the Input state is the same as the last requested binary message no
change will occur. When an input change occurs, the unit requests the
message number corresponding to the state of the inputs. The inputs must be
stable for 100 msec (debounce time) for the message to be requested (See
Program User Module for more details). Changing the individual binary
message request input lines slowly will cause unwanted message requests, if
several bits need to be changed. This would be noticeable on the display, if a
user were to utilize a thumbwheel switch to change messages.
OUTPUT MESSAGE REQUEST
Each output can be individually programmed to request a specific message
when activated. The appropriate message will be requested regardless of the
method used to activate the output, i.e. User Input, Count/preset processing,
serial command, etc.
Note: The Output must be active for a minimum of 50 msec. for the request to be seen.
MESSAGE CANCELLATION
Messages can be cancelled automatically, or manually. When cancelled,
messages programmed for maintained request, will be re-requested if the
display is available and the request source is still active. A request for a
message of the same or higher priority will cancel the current message on the
display. Messages can also be cancelled by a User Input programmed for
Cancel Message or via the serial port. The three programmable cancellation
options are Latched, Timed, and Til End. (See Program User Message
Cancellation for details).
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