I don't believe that any "ModBus" MIBs exist as they would a contradiction in terms. ModBus is communication protocol that is used to access ethernet connected devices (similar in function to SNMP, but very different in operation). You cannot use SNMP to access a Modbus device, you need something that understands the Modbus protocol. Now, it'd be awesome if NPM could, as industrial equipment (electrical panels, temperature sensors, etc) all use it, but based on the complete lack of discussion on Thwack, I do not believe it is even on the drawing board.
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