Rockwell Automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command - Manual (Page 160)

9–22 Diagnostic Counters
Publication 1770Ć6.5.16 - October 1996
Asynchronous Link Counters (1775ĆKA only)
This counter byte Counts the number of
29, 30
Command messages sent.
31, 32 Reply messages received.
33, 34 Command messages received.
35, 36 Reply messages sent.
37, 38 ACKs received.
39, 40 ACKs sent.
41, 42 NAKs received.
43, 44 NAKs sent.
45 Undeliverable reply messages.
46, 47 Computer link timeouts (preset to 500 ms).
48 NAKs accepted per message (preset to 10)Ċmaximum number.
49 ENQs sent per message (preset to 10)Ċmaximum number.
50 NAKs (current count).
51 ENQs (current count).