Comtrol UP DeviceMaster User Guide User Manual
Page 62
62 - Chapter 2. Programming Interface
DeviceMaster UP Modbus/TCP User Guide: 2000447 Rev. I
Retrieve Statistics Message
Parity Error Count
This attribute counts the number of packets with parity errors received on
the serial port.
Framing Error Count
This attribute counts the number of packets with framing errors received
on the serial port.
Overrun Error Count
This attribute counts the number of packets with overrun type errors
received on the serial port.
Received Consumed Sequence
Error Count
This attribute counts the number of received consumed sequence number
errors. The DeviceMaster UP only increments this number when all of the
following statements are true:
•
You selected the Unsolicited - Write-to-Tag-Synced method of receive
communication.
•
DeviceMaster UP receives a serial packet.
•
The Consumed Sequence number is out of sync. (It is not equal to the
Produced Sequence number or equal to the Produced Sequence number
minus one.)
Duplicate Transmit Sequence
Number Error Count
This attribute counts the number of Duplicate Transmit Sequence Number
errors. The DeviceMaster UP increments this number when the following
statements are true:
•
You enabled the Transmit Sequence Number Checking configuration
option. See Transmit Sequence Number Checking under
on Page 75 for additional information.
•
DeviceMaster UP receives a transmit message with a sequence number
equal to the previous sequence number. (The DeviceMaster UP expects
this sequence number to be incremented by one from the sequence
number in the previous transmit message.)
Unexpected Transmit
Sequence Number Error Count
This attribute counts the number of Unexpected Transmit Sequence
Number errors.The DeviceMaster UP increments this number when the
following statements are true.
•
You enabled the Transmit Sequence Number Checking configuration
option. See Transmit Sequence Number Checking under
.
•
DeviceMaster UP receives a transmit message with a sequence number
that is not equal to either the previous sequence number or the previous
sequence number plus one. (The DeviceMaster UP increments this
sequence number by one with each new transmit message.)
Dropped Packet to Application
Count
This attribute counts the number of dropped receive packets on the serial
port intended for the application due to:
•
No STX byte(s) found
•
No ETX byte(s) found
•
Time-outs
•
Too large of packet
•
Receive buffer queue overflows
Retrieve Statistics Message Description (Continued)