Rockwell Automation 1771-DA,D17716.5.13 U MNL 1771-DA ASCII I/O MODULE - Manual (Page 139)

Function of Control/Status Bits
Chapter 6
6Ć4
Bits: IW1(02-04)
Function: Mode of Module Operation
Description: Choose data mode (default) when
You want to automatically convert ASCII characters to any one of five
data types for convenient data table storage and usage
Your data string is from 1 to 62 characters
Choose report generation mode when
Your data is message oriented
You want to include BCD numbers in your message
Your data string is from 1 to 999 characters
Select the mode of module operation from the following:
04 03 02 Mode of Operation
0
0
0
0
0
1
Data mode
Report generation
mode
all
other
Invalid
When the module detects an invalid setting of bits 02-04 or bits 05-07, it
faults due to an initialization error. The module disables its interface port
and sets status bit SW1(12).
Bit: IW1(05-07)
Function: Mode of Transmission
Description: The modes of transmission that the module can handle are
full or half duplex with or without echo, and simplex read or write. The
codes for setting modes of transmission are:
07 06 05 Mode of Transmission
0
0
0
0
1
1
0
0
1
1
0
0
0
1
0
1
0
1
Full duplex with echo
(default)
Full duplex without echo
Simplex read
Simplex write
Half duplex with echo
Half duplex without
echo
all
other
Invalid