AN-X4-AB-DHRIO (DH+) Page 53
Counter Description
was received in the timeout period. Sometimes caused by sending
messages to stations that do not exist.
TX Queue 0 Number of messages in AN-X transmit queue 0
TX Queue 1 Number of messages in AN-X transmit queue 1 (write messages)
Received ACK/NAK too long AN-X was expecting an ACK and received a frame that was longer
than 3 characters instead.
Token pass retries exhausted AN-X retries the token pass up to 3 times. If it still fails, it increments
this counter, removes the destination from its active station list, and
tries to pass the token to its successor.
Token claimed Not used.
Illegal protocol NAKs sent/
Dup Stn
If AN-X receives a message that is shorter than the minimum length
(6 characters), it increments this counter and sends an illegal protocol
NAK to the sender.
It also increments this counter if it is a duplicate station
No memory NAKs sent
Only Stn
If AN-X receives a message and is out of buffer space, it increments
this counter and sends a no memory NAK to the sender.
It also increments this counter if it is the only station
Received frame too large AN-X received a frame that was larger than the maximum possible
size (308 bytes, including the 2 CRC bytes).
Receive frame aborted AN-X increments this counter when it receives a message that
doesn’t finish, either because the source aborted the message or
because the source went offline.
Frames successfully received 16-bit counter. AN-X increments this counter when it receives a
message (command or reply). It also increments the commands
successfully received or replies successfully received counter.
Replies successfully received 16-bit counter. AN-X increments this counter when it receives a reply
to a command it sent to another station.
Replies successfully sent 16-bit counter. AN-X increments this counter when it successfully
sends a reply to another station.
Counters are 8 bits except as noted in the table.
Counters roll over when they reach their maximum value, at 255 for 8 bit counters and 65535 for
16-bit counters.
The diagnostic counters are cleared when you reconfigure the Data Highway Plus network
parameters on AN-X. They can also be cleared from the web interface.
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