Page 52 AN-X4-AB-DHRIO (DH+) Nov 2022
Data Highway Plus Diagnostic Counters
AN-X maintains Data Highway Plus diagnostic counters. Use Automation Network/Monitor
DH+ Network in the web interface to view the diagnostic counters.
The diagnostic counters are:
Counter Description
Solicit ACK Bad Solicit ACK bad (not to AN-X, bad ACK value, or source is not the
station AN-X solicited)
Transmit retries exhausted AN-X retries messages up to 3 times (4 in total). If it still hasn’t
successfully sent the message, it discards the message and returns
an error.
RX Queue Number of messages in the AN-X receive queue
No memory NAK received AN-X sent a message and got a no memory NAK in response.
Token pass timeout AN-X passed the token but there was no response from the
destination in the timeout period. AN-X retries the token pass up to 3
times.
Token claim sequence entered AN-X increments this counter when there is no network activity (no
token passing, etc.). It then starts soliciting for stations to pass the
token to.
Bad CRC on received frame AN-X received a frame with a bad CRC. Usually caused by cabling
and termination.
RX noise If AN-X detects a carrier on the network and then the carrier
disappears before a frame starts, it increments this counter.
**** changed
Received frame too small AN-X received a frame smaller that the minimum possible size.
**** changed
Retry of a frame received AN-X received a frame with the same transaction number as a
previous frame. It discards the duplicate frame.
Frames successfully sent 16-bit counter. AN-X increments this counter when it sends a
message (command or reply) successfully. It also increments the
commands successfully sent or replies successfully sent counter.
Commands successfully sent 16-bit counter. AN-X increments this counter when it successfully
sends a command to another station.
Commands successfully received 16-bit counter. AN-X increments this counter when it receives a
command from another station.
Reply could not be sent AN-X increments this counter when it receives a command but could
not deliver the reply.
ACK timeout AN-X was expecting an ACK in response to a message but nothing
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