Rockwell Automation 2706-LV2P_LV2R_LV4P_LV4R DL40 PLUS USER MANUAL - Manual (Page 90)

Parallel Port Communications 7–10
Publication 2706-6.1
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If [CTRL][W] s are BCD (4 bit) variables, the [CTRL][W] in the
second position would be sent in the high nibble (4 bits) of the
high byte of Variable 4; the [CTRL][W] in the second position
would be sent in the low nibble of the high byte of Variable 4.
The low byte of the Variable 4 would be ignored (unless the
message contained more BCD variables).
This section shows operations you can perform in Message List Run
mode.
Create a List of Messages for Continuous Display
The list is created by adding message numbers to the list while the
DL40 Plus is in Run mode. See Chapter 6, Serial Port
Communications, for details on adding (or deleting) messages using
the RS-485/RS-232 port or the keyboard port.
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Messages are displayed in the order they are put on the list.
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Messages can be added to or deleted from the list while the list is
running.
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Messages are added to the end of the list. If a message is deleted
and re-added to the list, it is re-added to the end of the list.
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You can send a Priority Message Number which is queued as in
the Message/Variable/ Slave Run mode. When the message that is
currently displayed finishes running, all Priority Messages in the
queue will be run. After queued messages complete running, the
DL40 Plus resumes running the Message List.
Unlike the Message/Variable/Slave Run Mode, you cannot send
variables to be included in a message.
Important: The Message List is lost if you leave Run mode, reset
the DL40 Plus, or cycle power. You will have to create
a new list when you re–enter Run mode.
Put Messages on the Historical Events Stack
Same as Message/Variable/Slave Run Mode but includes entries for
adding or deleting messages.
Note: If the message’s Historical Events Stack attribute is set,
message data will be put on the stack once for each time the message
is displayed or redisplayed.
Message List Run Mode