Rockwell Automation 1771-DA,D17716.5.13 U MNL 1771-DA ASCII I/O MODULE - Manual (Page 57)

Choosing Module Features
Chapter 3
3Ć15
Select the BCD delimiter from the following hex characters:: 0A-0F,
1A-1F, 2A-2F, 3A-3F, 4A-4F, 5A-5F, 6A-6F, or 7A-7F.
Do not use:
Any character that otherwise would appear in the message
The end-of-string delimiter that you will select later
ASCII characters and their codes are listed in tables in appendix C.
Record your selection by writing either the 7-bit binary code, or the
2-digit hex code for the BCD delimiter in IW4(10-16) using the form
(found at the end of this chapter) or the boxes below.
IW4
BCD Delimiter
17 16 15 14 13 12 11 10
0
NOTE: The module defaults to the colon (:) as the BCD delimiter if you
do not use initialization word four (IW4). However, if you use IW4, you
must enter a BCD delimiter.
Margin justification refers to the manner in which data is displayed by
your ASCII device or stored in the data table (Table 2.H).
Margin justification is particularly evident when the number of data
characters transferred is less than maximum.
Your choice of margin justification depends on the mode of module
operation (Table 2.I).
Justifying Margins, IW3(03)