Monitor
Role
The Monitor module records events emitted by slave modules during an observation session and presents them as graphs. It lets you visualise, on a shared time axis, guiding quality, image HFR evolution, and focus interventions.
How it works
The Monitor watches the signals property of each configured slave module. Whenever a module emits an event (via setStateEvent), the Monitor records it with a timestamp and the associated numeric values.
Events are kept in memory for the entire session. On stop, they are exported to a timestamped JSON file under <webroot>/monitor/.
Monitored modules
| Module | Captured events |
|---|---|
| Guider | guideRMS — total guiding RMS (arcsec) |
| Guider | guideSNR — star detection signal-to-noise ratio |
| Focus | focusdone — final HFR after focusing (pixels) |
| Sequencer | imagehfr — HFR of the recorded image (pixels) |
Session graph
The main graph displays the entire session on a shared time axis.
| Curve | Description |
|---|---|
| Orange line | Guiding RMS (left axis, arcsec) |
| Blue dots | HFR of acquired images (right axis, pixels) |
| Green triangles | HFR measured at the end of a focus run (right axis, pixels) |
| Red dashed line | Guiding SNR (hidden by default, toggle via the legend) |
The double slider below the graph restricts the displayed time window without discarding in-memory data.
Actions
| Action | Description |
|---|---|
| Start | Starts a new recording session (clears previous data) |
| Stop | Stops recording and exports data to JSON |
Parameters
Parms
| Parameter | Description |
|---|---|
| Auto-start | Automatically starts recording when the module loads (saved in the profile) |
View filter
| Parameter | Description |
|---|---|
| From | Lower display bound (hides events before this time) |
| To | Upper display bound (hides events after this time) |
| Max rows | Maximum number of rows kept in the live view (default: 200) |
Monitored modules (Slaves)
Each entry selects the module instance to watch for a given type (guider, sequencer, focus, etc.).
JSON persistence
On each session stop, a file is exported to:
<webroot>/monitor/YYYYMMDD-HHmmss.jsonThe file contains column headers (gridheaders) and the data grid (grid) as an array of arrays, directly usable for external analysis.
With Auto-start enabled in the profile, the module begins recording one second after loading, without any manual action.