Industry Cellular Gateway
4.2 Data Logging
Data logging is the process of collecting and storing data over a period of time in order to analyze specific
trends or record the data-based events/actions of a system, or connected devices. Data logging function is a
very useful and also important feature for SCADA telemetry; it makes the monitoring and analyzing tasks easier
by checking the status and historical data during whole data acquisition period.
Even facing the network connection problems with remote NOC/SCADA side, you can also enable the data
logging proxy function provided by the purchased gateway and keep doing the data acquisition and storing the
collected data in local storage (in .CSV file format). When the network connection recovered, admin/user can
download the data log files manually via FTP or web UI for further reference and maintenance.
The Modbus Cellular Gateway provides a complete data logging function for collecting the Modbus transaction
data for application requirements. There are some data logging schemes to meet different management
requirements. They are the Sniffer Mode, Offline Proxy Mode, Full-Time Proxy Mode, and the mixed modes for
sniffer and proxy combinations.
With the Sniffer mode enabled, the gateway will monitor and record the communication among a specific
Modbus Master and related slaves. It will store the Modbus communication as log files and administrator can
check what Modbus communication went over the Modbus gateway, and if there is any communication loss
205
