Comtrol UP DeviceMaster User Guide - Manual (Page 32)

32 - Chapter 2. Programming Interface DeviceMaster UP Modbus/TCP User Guide: 2000447 Rev. I
Instance Attribute Definitions
2.3.3.4. Instance Attribute Definitions
Attribute Description
Attribute 1
Receive Byte Count
This attribute counts the number of bytes received over the serial port.
Attribute 2
Receive Packet Count: This attribute counts the packets received over the serial
port.
Attribute 3
Transmit Byte Count
This attribute counts the number of bytes sent out the serial port.
Attribute 4
Transmit Packet
Count
This attribute counts the number of packets sent out the serial port.
Attribute 5
Dropped Packet to
PLC Count
This attribute counts the number of received serial packets intended for the PLC
dropped due to:
• No STX byte(s) found
• No ETX byte(s) found
• Time-outs
• Too large of packet
• Receive buffer queue overflows
Attribute 6
Parity Error Count
This attribute counts the number of received serial packets dropped due to
parity errors.
Attribute 7
Framing Error Count
This attribute counts the number of received serial packets dropped due to
framing errors.
Attribute 8
Overrun Error Count
This attribute counts the number of received serial packets dropped due to
overrun error incidents.
Attribute 9
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.)
Attribute 10
Duplicate Transmit
Sequence Number
Error Count
This attribute counts the number of Duplicate Transmit Sequence Number
errors. The DeviceMaster UP only increments this number when the following
statements are true:
• You enabled the Transmit Sequence Number Checking configuration option.
(See Attribute 16 - Serial Port Transfer Options on Page 22 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.)