Diagnostics
Page 168 of 178
Figure 7.36
–
Modbus packet capture
To display the captured Modbus packets, the capture process must first be stopped, by
pressing the Stop button.
Figure 7.37
–
Modbus Packet Capture complete
The captured Modbus packets are tabulated as follows:
Statistic
Description
Index
The packet index, incremented for each packet sent or received.
Time
The elapsed time since the module powered up.
Status
The status of the packet. Received packets are checked for valid Modbus
constructs and valid checksums.
Port
Port on where the data was sent or received (TCP, RTU232, RTU485)
Dirn
The direction of the packet, either transmitted (Tx) or received (Rx).
Node
The Source Node address for the packet
Description
Description of the packet that was received.
Data
The raw packet data.
Table 7.15
–
Modbus Packet Capture fields
The packet capture can be saved to a file for further analysis, by selecting the
Save
button on
the toolbar. Previously saved Modbus Packet Capture files can be viewed by selecting the
Modbus Packet Capture Viewer
option in the tools menu.