SUPPORTED · SUPPORTED

S9 AutoSet data in Apnealytics

Yes — full support. The ResMed S9 AutoSet is well over a decade old, but it was the first ResMed machine to write the STR.edf and DATALOG format that the AirSense and AirCurve families still use. If your S9 is still running, Apnealytics reads your S9 AutoSet data from the SD card in full: nightly AHI, event mix, usage, leak, pressure and, on Pro, waveforms.

Create your free account Check compatibility

Drawn schematic silhouette of the S9 AutoSet on a teal blob (labelled not a photo) with a Supported badge and four fact rows: pressure range, modes, SD card files, year introduced

S9 AutoSet at a glance

The S9 has no app of its own. For many S9 owners, Apnealytics or OSCAR is the only way to see what the machine has been recording for years.

Spec	S9 AutoSet
Pressure range	4–20 cmH₂O
Modes	CPAP, AutoSet
EPR	Off, 1, 2, 3 cmH₂O
Ramp	Fixed, 0–45 minutes
Humidifier	H5i heated humidifier (separate, clips on), ClimateLine heated tube optional
SD card	Full-size SD card, shipped with the machine
Data files written	STR.edf, DATALOG/ (BRP.edf, PLD.edf, EVE.edf, CSL.edf, SAD.edf), Identification.tgt
Bluetooth / app	None (no myAir support)
Cellular modem	Optional external wireless module for clinicians
Year introduced	2010
Apnealytics status	Supported

Drawn schematic silhouette of an S9-style body with H5i humidifier on a teal blob, SD slot on the left side highlighted in mint (not a photo of the model)

Where the SD card is

The SD slot is on the left side of the S9 body, near the back. The card sits nearly flush, so press it in to release it and it will spring out a few millimetres. Turn the machine off first and wait a few seconds; the S9 writes its summary when the session ends. The screen shows a small card icon while writing.

Turn the S9 off and press the SD card to eject it.
Place the card in a reader on your computer
Card import is web-only today.
Sign in at my.apnealytics.com and open Import.
Drag the whole card folder onto the drop zone
The upload goes straight to private storage on Cloudflare R2 and resumes if interrupted.
When the import finishes, return the card to the S9
Repeat monthly; only new nights are added.

Import in five steps

What you'll see

Years of summary history
S9 cards often hold a long run of summary nights. Apnealytics imports them all and, on Pro, shows the full history in Explore (Yearly, then Monthly, then Nightly). Free accounts show the last 30 nights.
Nightly AHI with event composition
Obstructive, central and hypopnea events are recorded separately by the S9 and shown separately on every night, with the AHI band (Great, Mild, Moderate, High) up top. The S9 does not flag RERAs, so that strip will be empty.
Pressure P95, EPR and leak P95
AutoSet nights show the 95th-percentile pressure against the set range, with the EPR level beside it. Leak P95 sits next to usage. Attach your mask from the catalog and Mask Analytics compares seal, AHI and usage per mask. On Pro, the waveform viewer opens the S9's DATALOG files for airflow, pressure and leak.

Five-step import diagram for the S9: power off and remove card, reader on your computer, drag the whole card folder with STR.edf and DATALOG, browser straight to private R2 storage with resumable progress, only new nights added

Real Apnealytics dashboard in a browser frame with a drawn Explore card: yearly rollup of S9 nights 2016 to 2026, mean AHI per year falling from 7.8 to 2.7 with the Mild line at 5

Known quirks

Lower-resolution waveforms. The S9 records airflow at a lower sample rate than the AirSense 10 and 11, so waveforms look a little smoother. Events, pressure and leak are unaffected.
No respiratory rate on some firmware. Older S9 firmware may not write respiratory rate. The tile is hidden when the data is absent rather than shown as zero.
Card size. The S9 shipped with small cards and can be picky about large ones. Stick with cards of 2–8 GB formatted FAT32. If a card is not recognised, the machine shows a card error and will not record detailed data.
Clock drift. Over a decade the S9's clock can drift and its date may be wrong after a long power loss. Nights are imported as stamped; check the machine's date if nights appear on the wrong day.
Detailed-data retention. The S9 keeps DATALOG data for a shorter window than summary data, roughly 30 days by default. Import monthly to keep waveforms.
Tube and humidifier. The S9 uses the H5i and either a standard or ClimateLine tube. Settings changes for humidity appear in "What changed?".

Compatible masks

The S9 uses the standard 22 mm connection and works with every current ResMed mask, as well as older designs such as the Mirage series:

Nasal
AirFit N20, AirFit N30i
Full face
AirFit F20, AirFit F30i
Nasal pillows
AirFit P10, AirFit P30i

Three cards with real mask cut-outs on teal blobs: Nasal (AirFit N20 · AirFit N30i), shown AirFit N30i; Full face (AirFit F20 · AirFit F30i), shown AirFit F30i; Nasal pillows (AirFit P10 · AirFit P30i), shown AirFit P30i; footer: 22 mm tube, Mask Analytics per mask, replacement reminders

Set the mask type on the S9 to match the mask you wear so leak is reported correctly.

FAQ

Questions people ask

Help center →

Does Apnealytics still support the ResMed S9?

Yes. The S9 AutoSet, S9 Elite, S9 Escape and S9 VPAP models all write STR.edf and DATALOG files that Apnealytics reads. Import the SD card on the web portal and you get nightly AHI, event mix, usage, leak P95, pressure P95, EPR and trends, with waveforms on Pro.

My S9 has years of data. Can I import it all at once?

Yes. Drag the whole card folder in and every summary night is imported. Dedup handles cards that overlap. On the Free plan you will see the last 30 nights; the Pro plan unlocks the full history in Explore, from yearly roll-ups down to single nights.

Is there a myAir app for the S9?

No. The S9 predates myAir and has no Bluetooth. Apnealytics is a way to finally see the data the machine has been recording. The iPhone and Android apps show everything you import on the web, and sync Apple Health or Health Connect alongside.

Should I replace my S9 to get better data?

That is between you and your clinician. From a data point of view, the S9 records the same core measures as newer machines: AHI, event types, pressure, leak, usage. The AirSense 10 and 11 add higher-resolution waveforms, respiratory rate and RERA flags, and are supported too.

My S9 shows a card error. Is my data lost?

Nights recorded without a working card are not recoverable; the S9 stores detailed data only on the card. Nights already on the card are usually fine. Try the card in your computer and import what is there, then replace the card with a FAT32-formatted one of modest size.