Supported devices

Battery health is the reading that matters and the one most often missing. The pack reads charge, runtime and battery voltage alongside load, so a battery string that is losing capacity shows as a trend rather than as a failed transfer.

operating_mode is mapped to named states — normal, on_battery, bypass — rather than left as the integer the register holds. That is the point that decides whether anyone needs to be woken up, so it should read as a word.

Covers the Liebert-lineage units commonly found in UK data halls. Where a model exposes its register map through an add-in communications card, the pack is written against the card’s map and the card model is recorded in the definition, because two units of the same model with different cards are two different maps.

Read over the unit’s own Ethernet port or through an RS485 gateway. A unit with its own port is simply its own endpoint in the configuration. Behind a gateway it is addressed by its unit id on the bus, alongside whatever else shares that bus.

Floor PDUs and busway tap-off meters. All three phases are read and labelled per phase, so phase imbalance is a series you can alert on rather than a figure someone works out by hand during an incident.

current_imbalance_percent is derived in the gateway from the three phase currents. It is the number that gets a PDU looked at, and it is a derived figure almost everywhere it appears.

The EM series panel meters, typically several to a bus behind an RS485-to- Ethernet gateway. Energy counters are declared with their rollover point, so a counter that wraps produces a correct rate rather than a large negative spike in your graphs.

CRAHs, CRACs, chillers and the CDUs behind liquid-cooled racks. Supply and return are read as a pair on both the air and water sides, because the delta is what tells you whether you have thermal headroom and the absolute figures on their own do not.

Cooling plant is the most varied category here. Assume the specific unit needs mapping and treat it as a question for the enquiry, not a disappointment.

Aisle temperature and humidity, under-floor and containment differential pressure, and leak detection on chilled water and liquid-cooling loops.

These are usually the cheapest points on a site and the last to be monitored. They are also where a containment problem shows first, well before it reaches an inlet temperature that anything else notices.