Rockwell Automation 2755 Enhanced Decoder Series B - Manual (Page 259)

15–71 ASCII Host Commands
Publication 2755-833
NR - Read Symbols Not Read Counter
Command Format: NR
Function: Returns the count in the no-read counter.
Parameters: None
Response: pppppp<end>= rr <end>
pppppp = no-read count, up to 999999
<end> = end of message control code
rr= response code
<end>= end of message control code
Example:
Command: NR
Response: 000016CR = 00CR
000016= no-read count of 16
CR= end of message control code
for Carriage Return
00 = command complete
response code
CR= end of message control code
Carriage Return