DALI · Concepts

Glossary

The words used across the DALI documentation, in plain language.

Term	Meaning
Access code	An 8-character code shown in the Live3 app. Type it with your email to sign in to a station. It changes every minute and works once.
Access link	A signed link from Live3 that signs you in to one station with one role. It expires within 30 days and works once.
Activity log	The station's record of who did what and when. Tamper-evident, kept for 180 days.
Admin	The role for people who set up and look after a station.
Aeron Cloud	The upload that sends a station's data to Live3.
Calculated parameter	A parameter worked out from other parameters rather than read from a sensor.
CDAB	The byte order of the 32-bit floating-point values on the station's Modbus slave: the low 16-bit word first, each word most significant byte first.
Commissioning	Getting a new station ready for service. Done by Aeron staff on the Commissioning page.
Conflict	A setting where the station and Live3 hold different values. Always shown to a person to decide.
Continue with Live3	Signing in to a station by confirming who you are in Live3 in your browser.
Create Interval	How much time one data file covers, for example 1 hour or 1 day.
DALI	The web console built into every XTM station.
Destination	On firmware 4.1 and later, a place the station sends data to, such as your HTTPS endpoint, Azure, AWS or an MQTT broker.
Factory	The role for Aeron staff. Granted by Live3 only.
Firmware	The software that runs the station, including the console.
GPS Fix	A column in data files showing whether the GPS had a position when the record was made.
Hotspot	The station's own Wi-Fi network, for people on site. The console is at 192.168.4.1 on it.
Live3	Aeron's cloud platform and mobile app. It manages who can reach a station and keeps a copy of its settings.
Logged data	One record per logging interval, for example every minute. Also called processed or minute data.
Modbus master	The station reading values from a sensor or device over Modbus.
Modbus slave	The station answering a SCADA system or PLC that reads values from it over Modbus.
NaN	"Not a number". Written in place of a value when its sensor has stopped answering, so it cannot be mistaken for a real zero.
Network guard	The safety net that puts the previous network settings back if a change cuts the station off.
Over-the-air update (OTA)	A firmware release that reaches a station through Live3 instead of by hand.
Parameter	One named value the station records, with a unit and a number of decimals.
Quality	Whether a value is fresh (just read), held (the last value, between reads) or stale (the sensor has stopped answering).
Raw data	Readings recorded at a short fixed interval, 1 to 30 seconds, each with a Valid flag. Also called 1-second or instantaneous data.
Role	What you may do on a station: Factory, Admin or User. It comes from Live3.
SCADA	The supervisory system at a plant that reads values from devices such as the station.
SD card	Removable storage in the station for a long-term, encrypted archive.
SDI-12	A serial bus used by many environmental sensors.
SeRA	Remote support: a time-limited session that lets Aeron support reach a station.
Sequence number	A parameter's position on the Parameters page. It sets the column order in files and the register on the Modbus slave.
Serial number	The station's unique number, printed on the enclosure. The hotspot name ends with its last four digits.
Staged update	A firmware release downloaded and verified on the station, waiting to be installed.
Stale	A value whose sensor has stopped answering.
Station	An Aeron XTM data logger and everything connected to it.
Sync	Keeping a station's settings and Live3's copy of them in step.
Update Interval	How often a record is written: 1 to 60 minutes for logged data, 1 to 30 seconds for raw data.
User	The read-only role: the Dashboard and Data output.
Valid flag	The column after each value in raw data files: 1 fresh, 0 held, 2 stale, 3 never received since the station started.
XTM	Aeron's station hardware.