Rockwell Automation 1771-DA,D17716.5.13 U MNL 1771-DA ASCII I/O MODULE - Manual (Page 156)

Function of Control/Status Bits
Chapter 6
6Ć21
Initialization Word Two
Bit Function Status
17 Single or Multiple
String Transfer
(Rate)
0*=Module sends single string
1=Module sends two or more strings per
block transfer
16, 15, 14 Data conversion 000* = 2 ASCII characters per word
001 = 3 BCD characters per word**
010 = 4 BCD characters per word**
011 = 1 ASCII character per word
100 = 4 Hex characters per word
13Ć00 Number of ASCII
Characters per
String
Bits 00Ć03 = BCD digit 0
Bits 04Ć07 = BCD digit 1
Bits 10Ć13 = BCD digit 2
Data mode: default = 10, max = 62
RG mode: default = 124, max = 999
*Default value when you do not
select that initalization word.
**Must select either one in RG mode
Initialization Word Three
Bit Function Status
17 Enables
EndĆofĆstring (EOS)
Delimiter
0 = Module transfers data when it detects
EOS delimiter
1 = Module ignores EOS delimiter
16Ć10 EndĆofĆstring
Delimiter
Bits 10Ć13 = First ASCII character
Bits 14Ć16 = Second character
The module defaults to null (CTRL 0)
if IW3 is not used.
07, 06 Delay for Carriage
Return (RG mode,
only)
00* = 0ms
01 = 50ms
10 = 100ms
11 = 200ms
05 Line Feed if Carriage
Return
0*= Inhibits function
1 = Enables function
04 Sends EOS Delimiter
to Processor (RG
mode, only)
0* = Inhibits function
1 = Enables function
03 Margin Justification
(Data mode, only)
0* = Right justification
1 = Left justification
In RG mode, ASCII data is left justified,
BCD values within string are right
justified, automatically.