From the manufacturer manual
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Generator controllers
HGM9520N
312 registers
The SmartGen HGM9520N is a genset paralleled (with mains) controller. SmartGen publishes one communication protocol document for the HGM9510N, HGM9520N and HGM9530N, and this map follows it: status and alarm bit words, seven alarm class fields, generator, mains and busbar voltage, current, power and frequency, engine and ECU values, running hours, energy counters, controller clock, DM1 and DM2 diagnostic codes, and remote command coils. Rows where the document distinguishes the HGM9520N from the other two models are marked in their notes.
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