Video: Why do Modbus Tester and the EGX webpage reading values differ from the front panel of the meter?
Issue
When I read the value from the front display of a meter it looks correct however when I read it the value as a register read from the EGX webpage or the Modbus Tester tool the value returned is vastly different.
Example: The front panel of the meter displays -9,173 kVAR yet the direct register reads yield a value of 56362
Product Line
EGX100
EGX300
Modbus Tester
Environment
Reading and Interpreting Modbus Registers
Cause
The registers are stored in the meter as a signed 32 bit value but the EGX register read and Modbus Tester treat the register as an unsigned 32 bit value.
Resolution
See the provided video for a detailed explanation on why the values being read are different and how to find the correct value.
To download the Modbus Tester, please follow the link FA180037 .
When I read the value from the front display of a meter it looks correct however when I read it the value as a register read from the EGX webpage or the Modbus Tester tool the value returned is vastly different.
Example: The front panel of the meter displays -9,173 kVAR yet the direct register reads yield a value of 56362
Product Line
EGX100
EGX300
Modbus Tester
Environment
Reading and Interpreting Modbus Registers
Cause
The registers are stored in the meter as a signed 32 bit value but the EGX register read and Modbus Tester treat the register as an unsigned 32 bit value.
Resolution
See the provided video for a detailed explanation on why the values being read are different and how to find the correct value.
To download the Modbus Tester, please follow the link FA180037 .
Released for: Schneider Electric Canada
