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- all Fronius IG Plus units have one 'Fronius COM Card'
- one Fronius IG Plus has a 'Fronius Datalogger Card' (no. 2)
- Fronius Datalogger has two RS-232 interfaces for connecting to a PC and a modem
Option cards communicate within the Fronius IG Plus via its internal network. External
communication (Solar Net) takes place via the 'Fronius Com Cards.' Each 'Fronius Com
Card' is equipped with two RS485 interfaces - an input and an output. RJ45 plug connec-
tors are used to connect to these cards.
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