Rockwell Automation 1771-DA,D17716.5.13 U MNL 1771-DA ASCII I/O MODULE - Manual (Page 145)

Function of Control/Status Bits
Chapter 6
6Ć10
Bits: IW3(06-07)
Function: Delay for Carriage Return
Description: Select a time for the ASCII module to delay outputting data
to allow for the mechanical carriage return when using an unbuffered data
terminal.
07 06 Delay (ms)
0
0
1
1
0
1
0
1
0
50
100
200
Bits: IW3(10-16)
Function: End-of-String Delimiter
Description: The end-of-string delimiter causes the module to transfer the
string of characters to the PC processor data table (single string transfer).
When you select multi-string transfer, the module transfers the number of
strings that fills one block transfer.
In data mode, select the end-of-string delimiter the same as that of your
ASCII device. If your ASCII device does not generate an end-of-string
delimiter, set IW3(17). Then, the ASCII module ignores these bits.
Without an end-of-string delimiter, the module transfers your data string
immediately after its input buffer receives the next characters beyond your
selected string length. The next characters remain in the buffer as the
beginning of the next string, and the cycle repeats.
In report generation mode, select any ASCII character as the end-of-string
delimiter.
If a series of BCD numbers in a string is divided by a block transfer,
either one of two results can occur. If the string of correct length is
divided by a block transfer, the balance of BCD characters will be
transferred correctly in the next transfer. If you erroneously allowed the
string to exceed your selected string length, the balance of the BCD
numbers will be transferred as ASCII characters.
Do not enter the same ASCII character in IW3(10-16) and IW4(10-16), or
allow them to be equal by default. When you are not using IW4,
IW4(10-16) defaults to the colon, 3A hex, in either mode of module
operation. Therefore, when using three initialization words, or fewer, do
not user the colon, 3A hex, as your end-of-string delimiter. When the