Rockwell Automation 2706-LV2P_LV2R_LV4P_LV4R DL40 PLUS USER MANUAL - Manual (Page 71)

Serial Port Communications 6–3
Publication 2706-6.1
You can use the RS-485 port to:
•
upload and download message files using a multi-drop
connection.
•
communicate to one or more slave message displays.
Note: To send messages to a slave, you must set the Port Use for
the RS-485 port to DL Slaves.
•
trigger Open protocol messages.
•
input variable data in the Message/Variable/Slave Run mode and
Message/ Variable Run modes using Open Protocol triggering.
•
dynamically add or delete messages to or from the list in Message
List Run mode.
•
test displaying messages.
•
set the DL40 Plus using the computer’s real time clock.
•
return [CTRL][X] (ASCII Input) data.
Note: ASCII Input data can only be returned via the RS-485 Port if
the message was triggered via the RS-485 Port.
!
ATTENTION: Do not attempt to trigger messages and
return ASCII Input Data simultaneously. Doing so will
cause both transmissions to become corrupted.
Using the RS-485 Port