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The following statistics are maintained:
TCP status
Status of the TCP/IP connection as per TCP finite state machine (refer to RFC 793).
If no client is connected the status indicates LISTEN. If a client is connected, it's IP
address is shown.
Accumulative connections
A counter that increments each time a client opens a Modbus/TCP connection.
Requests
A counter that increments each time an inbound request message is successfully
received.
Replies
A counter that is incremented each time a reply message is sent back to the master.
This includes exception replies.
CRC errors
A counter that increments each time a message is received that has a CRC that does
not match what is calculated. Typically the result of wiring issues. Messages with CRC
errors are discarded and not replied to.
Invalid frames
A counter that increments each time a malformed Modbus frame is detected.
Malformed frames are for example messages larger than the allowed maximum PDU
size defined in the Modbus standards. This can be caused by non-Modbus traffic on
the network.
Rx time-outs (Modbus serial line)
A counter that increments each time an inter-character time-out occurred during the
reception of an inbound message.
Rx time-outs (Modbus/TCP)
A counter that increments if the master connection has timed out. Subsequently the
connection is terminated by the GCP-MG. A time-out occurs if no Modbus request is
received from a connected client within a 10 second period.
Tx time-outs
Number time-outs occurred when attempting to send a reply message.
The cumulative diagnostic data is reset when the device is power cycled or reset. The
data is also reset by pressing the Clear Counter button.
CAN communication status
The CAN Status page shows status and statistics about the CAN bus traffic. These
values provide valuable information used to troubleshoot CAN problems. This page is
automatically updated every 5 seconds.
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UMGCPMG-2201
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