Rockwell Automation 2706-LV2P_LV2R_LV4P_LV4R DL40 PLUS USER MANUAL - Manual (Page 79)

Serial Port Communications 6–11
Publication 2706-6.1
ASCII Input Data in a message is represented by underscored spaces.
A flashing cursor will mark the position of the ASCII character.
To enter ASCII data for [CTRL][X] callouts with the keyboard, use
this format:
ASCII (keyboard characters) data [CR]
ASCII Data [
↵
]
where:
Data Acceptable Values
ASCII Data
1 to 20 ASCII characters. Data is for the latest
message sent to the specified DL40 Plus.
ASCII Input Data can only be returned via the RS-485 Port if the
message was triggered via the RS-485 Port, via the RS-232 Port if
the message was triggered via the RS-232 Port, or via the Remote
I/O Port if the message was triggered via the Remote I/O Port.
Sending ASCII Data
from the Keyboard Port