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Qlight ST56EL Beacon
The Qlight ST56EL is a Ø56 mm LED signal tower. Revolution drives the USB variant, which Revolution’s device entry describes as carrying red, yellow and green lamps together with a sounder — so a cell can be both seen and heard when it needs attention.
At a glance
Section titled “At a glance”| Diameter | Ø56 mm |
| Height | 341 – 566 mm |
| Protection rating | IP23 |
| Light source | LED, steady/flashing |
| Lamps driven | Red, yellow, green, plus sounder |
| Revolution control | Schedule state drives the tower; addressed by USB device index |
Series specifications
Section titled “Series specifications”Qlight publishes the following additional details for the ST56EL series.
| Voltage options | DC 12 V, 24 V; AC 110 V, 220 V, 12 V, 24 V |
| Lens material | AS |
| Housing material | ABS |
| Pole material | Aluminium |
| LED service life | Over 20,000 hours |
Note the IP23 rating (above): this is a signal tower for a lab or plant floor, not a washdown environment. Check it against where you intend to mount it.
The voltage options above are for the ST56EL series generally. The USB variant Revolution drives takes its control signal over USB from the host — confirm your specific unit’s supply arrangement against the documentation supplied with it.
How Revolution uses it
Section titled “How Revolution uses it”The tower is primarily a status indicator: Revolution’s running/paused/error state drives the red, yellow and green lamps directly, with no schedule step required.
| Property | Purpose |
|---|---|
| USB Device Index | Which attached Qlight unit this device addresses |
There is also one operation a schedule can call directly: Fire Sounder, which sounds the beacon for a given duration and then silences it. This is independent of the lamp state driven by running/paused/error.
The index exists so that more than one tower can be driven from a single host — useful when one PC supervises several cells and each needs its own indicator. Get the indices the wrong way round and two cells will report each other’s state, so confirm which physical tower responds before relying on it.
Integration
Section titled “Integration”Revolution talks to the ST56EL over USB, addressing the unit by its device index rather than by a serial port.
Prerequisites
Section titled “Prerequisites”- The tower must be connected before the device is initialised.
- If more than one Qlight unit is attached to the host, confirm which index corresponds to which physical tower.
If you need more of this instrument driven from a schedule, get in touch — the driver is extended on demand.