Owners Manual
2800 Series Marquee
3.1.2 Queue Dump [CTRL-B]
Address Header Queue
Dump
CTRL-B A CTRL-B
02h 41h 02h
• Address Header – directs the command to the specified marquee. To send the command to a different
marquee, change the second character of the address header to the address of the marquee you wish to send
the command to. If you have disabled the addressing feature of the marquee, do not send the address header
section.
• Queue Dump – instructs the marquee to return the list of recalled messages.
Use the queue dump command to retrieve a list of all the currently recalled messages. When the command is
executed, the marquee transmits the three digit messages numbers of the recalled messages in the format:
[n][n][n][Space][n][n][n][Space]... [Control-M][Control-J]
3.1.3 Display Buffer [CTRL-D]
Address Header Display
Buffer
CTRL-B A CTRL-D
02h 41h 04h
• Address Header – directs the command to the specified marquee. To send the command to a different
marquee, change the second character of the address header to the address of the marquee you wish to send
the command to. If you have disabled the addressing feature of the marquee, do not send the address header
section.
• Display Buffer – instructs the marquee to copy the text entry buffer to the immediate message buffer. The
marquee will display the contents of the immediate message buffer, if there are no stored messages recalled
for display.
Normally, after a text entry command is completed, the text entry buffer is copied to the immediate message
buffer. However if an invisible entry command is issued to the marquee before the text entry command, the
marquee skips copying the text entry buffer to the immediate message buffer. This command can be issued after
an invisible text entry, to instruct the marquee copy the text entry buffer to the immediate message buffer, which
will make the marquee display the message unless stored messages are recalled. For more information on the
invisible entry command, see manual section 3.1.6.
Note: 5
th
generation 2800 marquees do not need this command, but is retained for reverse compatibility with
previous generations of the 2800 marquee.
Previous generations of the 2800 need the display text entry buffer command because the text entry command
scrolled text onto the display as it was “typed”. A behavior that is convenient when you are manually typing the
command, but very annoying when real time data is being continuously sent from a PC/PLC.
The workaround on previous generations, was for the PC/PLC to send three commands each update cycle. First
an invisible entry command, then a text entry command, and finally a display text entry command.
Since most of the time, the 2800 marquee is used as a real time information display, we have changed the text
entry command behavior, so that it no longer scrolls text onto the display as it is “typed”.
Page 24 PB-2149-335B
(12 Seiten)
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