SymphoniePRO User Manual
Rev. 8
support@nrgsystems.com | Page 155
11 January 2018
Modbus Data Flow Diagram
1.
Sensor signals are received by the logger through its wiring panel.
2.
The raw sample (1 second) data are scaled using the conversion factors in the logger. The scaled real-
time data are passed to the iPackACCESS and formatted into Modbus registers (detailed in the Modbus
Protocol section).
3.
At the end of each statistical interval, statistical values are computed from the sample data in the logger,
and the statistical data are passed to the iPackACCESS and formatted into Modbus registers.
4.
When the Modbus server is enabled, the iPackACCESS makes the scaled statistical and real time data
available on their designated registers.
5.
The scaled real-time and statistical data can be polled through an Ethernet network by a Modbus client.
6.
A Modbus client can poll the iPackACCESS registers for data once a second. The statistical data registers
are updated at the end of each statistical interval.
Summary of Contents for SymphoniePRO
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