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is it possible to monitor via SNMP the current and historical values of Modbus devices connected to the EGX?

The EGX supports SNMP, allowing a network administrator to remotely access an EGX with an SNMP manager and view the networking status and diagnostics in the MIB-II format.
There is no specific data collected from Modbus Slaves that is available over SNMP: no PM, no logs and no trends.
Modbus registers values could be monitored with a ModbusTCP Client, settings would be like for any normal Modbus RTU <-> Modbus TCP gateway.
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