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[Equipment] Where does the S9 keep its settings
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justMongo Offline

Monitors

Posts: 3,839
Joined: Sep 2013

Machine: ResMed VPAP Auto (S9)
Mask Type: Full face mask
Mask Make & Model: ResMed Mirage Quattro
Humidifier: ResMed H5i
CPAP Pressure: 18 IPAPmax - 11 EPAPmin, PS=5
CPAP Software: Other Software

Other Comments: μολὼν λαβέ

Sex: Male
Location: Калифорния

Post: #11
RE: Where does the S9 keep its settings
(03-16-2014 01:21 PM)c0reDump Wrote:  First off, S9s are not life support equipment Smile -- I'm not going to keel over in minutes (or weeks) if I go without the CPAP.

Secondly, I doubt the S9s would revert to some kind of "default prescription" if the clinician's settings were wiped (for whatever reason, be it dead CMOS battery or whatnot). It would probably display some error code on the LCD screen if the settings were wiped / not set.

S9's have hard coded defaults. You can do a full reset on the machine; and all parameters will default to those hard coded defaults (except total run hours.)

Not life support; perhaps a poor choice of words on my part; but, a sleep apnea patient could wake up dead. Or, if the machine fails to hold the prescribed treatment, and a patient has worsening heart disease -- then finds out the machine had a design fault because some engineer decided volatile memory was cheaper -- that's the stuff lawsuits are made of.

Oh-jeez

INFORMATION ON APNEA BOARD FORUMS OR ON APNEABOARD.COM SHOULD NOT BE CONSIDERED AS MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A PHYSICIAN BEFORE SEEKING TREATMENT FOR MEDICAL CONDITIONS, INCLUDING SLEEP APNEA. INFORMATION POSTED ON THE APNEA BOARD WEB SITE AND FORUMS ARE PERSONAL OPINION ONLY AND NOT NECESSARILY A STATEMENT OF FACT.
(This post was last modified: 03-16-2014 01:49 PM by justMongo.)
03-16-2014 01:48 PM
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SleepWrangler Offline

Preferred Members

Posts: 41
Joined: Mar 2014

Machine: ResMed AutoSet
Mask Type: Nasal pillows
Mask Make & Model: PR GoLife for Men
Humidifier: H5i
CPAP Pressure: 9 - 12
CPAP Software: ResScan SleepyHead

Other Comments: Sleep Study AHI: 34.1, Now feeling well rested ... still room to improve.

Sex: Male
Location: Ontario Canada, New York

Post: #12
RE: Where does the S9 keep its settings
(03-16-2014 01:01 PM)justMongo Wrote:  I would never base a design for life support equipment on volatile CMOS memory with a battery when non-volatile memory is available and cheap.

I think you nailed it. ResMed has a partnership with STMicroelectronics using the ARM Cortex-M processors. These usually have program flash, configuration eeprom, and ram on-chip. They also have a backup battery connector and an RTC backup battery connector.
(This post was last modified: 03-16-2014 02:25 PM by SleepWrangler.)
03-16-2014 02:24 PM
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brianwood619 Offline

Advisory Members

Posts: 171
Joined: Jan 2014

Machine: ResMed S9 VPAP Auto
Mask Type: Full face mask
Mask Make & Model: F&P Simplus
Humidifier: H5i Heated Humidifier
CPAP Pressure: 16-22cm/h2o
CPAP Software: ResScan SleepyHead

Other Comments:

Sex: Male
Location: Peaceful Acres

Post: #13
RE: Where does the S9 keep its settings
My elite is set for the following
Pressure: 12 (found in clinical settings)
EPR: full-time (found in clinical settings)
EPR level: patient (found in clinical settings)
Ramp time: 15 minutes (patient settings)
EPR Inhale: Med (clinical settings)
EPR level: 3 (patient settings)
Tube heat: 80
Humidity: Auto

With my machine set this way it feels like natural breathing to me using a simplus oral nasal mask. With the inhale set at medium I don't get aerophagia like I used to because I think set on fast was forcing air a little too quickly. My AHI has consistently been less than 1.0 and most nights 0.0. Resmed makes a good machine, once you get all the settings in harmony it's even better.

Good luck
03-26-2014 10:33 AM
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