USER MANUAL Manual

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