Rockwell Automation 57C442 Data Highway Plus Interface Module - Manual (Page 53)

G-1
Appendix G
Register Map for Diagnostic Counters
This area contains statistics for the network as a whole and also for this station.
These values are returned to any remote station which requests them from this
station. This is also the format of data in counters returned from remote stations to
this station. These registers are read only.
Register Byte Meaning
40 LO Received ACK with bad CRC
Hl (not used)
41 LO Timeout expired with no ACKs received
HI Transmit re-tries exhausted
42 LO NAK/illegal protocol operation received
HI NAK/bad LSAP received
43 LO NAK/no memory received
Hl Received ACK/NAK too short
44 LO Received ACKJNAK too long
Hl Something other than ACK/NAK received
45 LO Token pass timeout
HI Token pass re-tries exhausted
46 LO Claim token sequence entered
HI Token claimed
47 LO Bad CRC in received frame
HI NAK/illegal protocol operation sent
48 LO NAK/bad LSAP sent
HI NAK/no memory sent
49 LO Received frame too small
HI Received frame too long
50 LO Received a re-transmission of a frame
HI Received frame aborted (line noise)
51 Message successfully sent
52 Message successfully received
53 Command successfully sent
54 Reply successfully received
55 Command successfully received
56 Reply successfully sent
57 LO Reply could not be sent
HI Number of active nodes