Rockwell Automation 1771-DA,D17716.5.13 U MNL 1771-DA ASCII I/O MODULE - Manual (Page 69)

Choosing Module Features
Chapter 3
3Ć27
Communication Rate
Match the communication rate of your ASCII module with that of your
ASCII device. Set bits IW1(10-12) accordingly. Your selections are:
Communication
Rate Code
300 baud 000
600 baud 001
1200 baud 010
2400 baud 011
4800 baud 100
9600 baud 101
110 baud 110
Number of Data Bits
Your ASCII device generates either seven or eight data bits per character
(Figure 2.11). The ASCII module neither stores nor outputs the eighth bit,
but must know if it is there. Use the default value (eight bit data) if this
information is not available. Set bit IW1(113) accordingly.
Figure 2.11
Data Byte Storage in Module
Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7
Bit 8
0
Eighth bit is ignored by the ASCII Module
11830