Rockwell Automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command - Manual (Page 148)

9–10 Diagnostic Counters
Publication 1770Ć6.5.16 - October 1996
This counter byte Counts the number of
21, 22
Times the node attempted to send a message.
23, 24 Messages were successfully transmitted and ACKed.
25, 26 ACKs received.
27
ACKs successfully passed from the receiver's separator to the
transmitter.
28 NAKs received.
29 NAKs passed from the separator to the transmitter.
30 Timeouts waiting for a response.
31 ENQs sent.
32 Messages that could not be successfully sent.
33 Reply messages that could not be forwarded and were destroyed.
34, 35 Messages received.
36, 37 ACKs sent.
38 NAKs sent.
39 ENQs received.
40
ReĆtransmissions received and ACKed.
A reĆtransmission is a message that has a transparent word,
command, and source that match the previous message.
41
STX (fullĆduplex mode) or SOH (halfĆduplex mode) received.
This is a count of the number of messages that were started.
42 Messages, characters, or message fragments that were ignored.
43 Messages aborted by receipt of a DLE ENQ.
44
Messages aborted by the receipt of an unexpected control code
other than DLE ENQ.
45
Times the DLE ACK response was sent but there was no buffer
space for the next message.
46 DLE NAK was sent because there was no buffer.
47 Broadcast messages received.
48 Broadcast messages that were successfully received.
49 Messages seen that were not for this node.
50 DLE EOTs sent.
51 Calls received.
52 Times the phone was hung up by the module.
53 DCD was lost.
54 Times the phone was hung up because of a DCD timeout.