ResMed S9 / ResScan lost an hours worth of sleep data

dave21 wrote:I've hit both the skew problem and the gap problem where exactly an hour goes missing. Both fixed it for me by formatting the SD carrd (I did it in my Laptop) but you can do it on the S9, and then starting to power cycle the S9 on a nightly basis.

Dave

When you say "fixed it for me"... did that mean it corrected the 1 hour missing data and you now have the missing time "back" or you just started over with fresh session
When you power down... do you have the card in or out If you place the card back in... when Does it write to the card right way

Right now... I've got more questions than answers.

Nord

Nord wrote:When you say "fixed it for me"... did that mean it corrected the 1 hour missing data and you now have the missing time "back" or you just started over with fresh session

Hi Nord, it didn't actually correct the missing time. By formatting the SD card you're wiping out the summary, detailed and high resolution data from the card, so what I already had imported into ResScan was already corrupted from the card from what I believe is the S9 that's corrupting it. So there is no way to get back that missing hour on the flow report.

What it fixed for me both in the missing hour and also in the skews is that by formatting the SD card and power cycling the S9 you're effectively resetting it to start writing to the card from fresh, so if there is any likelihood of the S9 being out of step on 1 or more of the sets of data, you are effectively correcting this at the source (e.g. S9) so it doesn't continue to write skewed or missing data.

What it doesn't unfortunately do is bring back the missing hour. What I'm working on is trying to mess around with my corrupted data file to see if there's anyway I can get that extra hour back. It's a work in progress and if I manage to find out a way to fix this on already corrupted data I'll let you know

Nord wrote:When you power down... do you have the card in or out If you place the card back in... when Does it write to the card right way

Right now... I've got more questions than answers.

Nord

I basically take the card out in the morning, lock it, place it in my Laptop, read it, unlock it, then place it back in the S9. Just prior to powering on the machine I unplug the cable for 30 seconds at the back of the S9 and power it back on. I have the SD card still inserted at this time. That way the S9 gets a complete reset prior to use.

Thanks
Dave

dave21 wrote:What it fixed for me both in the missing hour

I had an hour of missing data on my VPAP ASV last Sunday, 4/4.

It was from 2-3 am. I have my machine directly connected to the computer via serial cable.

My **guess** is that the machine has an older, existing program to accomodate daylight savings time. In the US, they changed DST to happen earlier in the year than in the past. I assume my machine is running old software/an old algorythm (although it appears to be less than 1 year old, about 350 days as far as I can tell. But it is an older generation machine. My guess is that they never updated the software/firmware.)

Just my guess, too, but I have a feeling that DST was scheduled to occur on 4/4 before the law was changed?


EDIT: Found this in a quick search. Looks like 4/4 would have been the old switch to DST. Maybe that explains the previous 1 hour issue? Machine had one program, ResScan had a newer algorythm?

The time between the old and new DST dates is sometimes referred to as the Extended Daylight Savings Time period.

Old DST start date: First Sunday in April (would have been April 1, 2007)
NEW DST start date: Second Sunday in March (will begin at 2:00 A.M. on March 11, 2007)


I usually only have a handful of hypopneas lately, maybe 5 per night, so I didn't worry about it too much. Just an "FYI" for you guys whose logic circuits in the brain still work, unlike mine which are severly damaged ....

(Just as an aside: I was always relatively intelligent, and always had a really great memory. It is really odd adapting to being "stupid", not being able to think things through, saying the wrong things from memory, and just basically "giving up" at a certain point in trying to untangle logical problems. Oh, never mind - I'll just go watch TV for a while! )

Michael

unadog wrote:...Just as an aside: I was always relatively intelligent, and always had a really great memory. It is really odd adapting to being "stupid", not being able to think things through, saying the wrong things from memory, and just basically "giving up" at a certain point in trying to untangle logical problems. Oh, never mind - I'll just go watch TV for a while!

Hey, when you start getting restful sleep and supply the brain with all it needs to create new brain cells and new neural connections, it will! Research during the past 5 yrs or so shows that ALL adults can and do make new brain cells and new neural connections. There is hope. I went from being like you...TV & junk fiction. Now, I can read my Scientific American, Popular Science, Pub Med articles, Architects Journal (as in high-tech architect not buildings) as well as TV and junk fiction (hey, I now like the silly things). I take omega 3s, high DHA, grape seed extract (GSE) with resveratrol, ubiquinol, quercetin+C combo, L-proline+L-lysine+hawthorne+GSE combo, 800 mgs magnesium citrate, tocopherols+tocotrienols (all gazillion forms of vit E), an excellent multi/mineral -- these all support brain function and reduce inflammation. Diet matters: reduce all veggy & seed oils except increase organic coconut oil & olive oil (both are brain and heart healthy don't fall for the hype, read the studies on these), tree nuts are good but don't gorge, whole eggs are good (yolks contain much needed sulfur) but don't eat the whites-only products or powdered (shudders), reduce grains & sugar to nothing or bare minimum (they mess with the insulin-glucagon balance & de-stabilize blood sugar), eat modest amts of berries the darker the better, eliminate all trans fats (anything commercially fried uses a form of canola oil that at least 50% trans fat) as it's poisonous for the heart & brain, no aspartame (Equal) as it's an excitotoxin deadly to brain cells (some more sensitive than others), eliminate all fructose as it creates fatty deposits in the liver and that's a really really bad thing to do. Some say avoid Splenda (sucralose) but if you've got as much wt to lose as I have the prospect of that is pretty grim. Low and ultra low carb work for wt loss for most people; some don't do well and are better off low fat, high carb, mod protein. High saturated fat & low carb generally results in a very large (safe) LDL particle size. Studies show green tea is excellent but so far I can't get past the taste Much of my cognition has slowly returned, my short-term memory probs are less frustrating as they've improved but are still exist ...getting a reader & software to see if I can optimize therapy for more recovery.

unadog wrote:

dave21 wrote:What it fixed for me both in the missing hour

I had an hour of missing data on my VPAP ASV last Sunday, 4/4.

It was from 2-3 am. I have my machine directly connected to the computer via serial cable.

My **guess** is that the machine has an older, existing program to accomodate daylight savings time. In the US, they changed DST to happen earlier in the year than in the past. I assume my machine is running old software/an old algorythm (although it appears to be less than 1 year old, about 350 days as far as I can tell. But it is an older generation machine. My guess is that they never updated the software/firmware.)

Just my guess, too, but I have a feeling that DST was scheduled to occur on 4/4 before the law was changed?


EDIT: Found this in a quick search. Looks like 4/4 would have been the old switch to DST. Maybe that explains the previous 1 hour issue? Machine had one program, ResScan had a newer algorythm?

The time between the old and new DST dates is sometimes referred to as the Extended Daylight Savings Time period.

Old DST start date: First Sunday in April (would have been April 1, 2007)
NEW DST start date: Second Sunday in March (will begin at 2:00 A.M. on March 11, 2007)


I usually only have a handful of hypopneas lately, maybe 5 per night, so I didn't worry about it too much. Just an "FYI" for you guys whose logic circuits in the brain still work, unlike mine which are severly damaged ....

(Just as an aside: I was always relatively intelligent, and always had a really great memory. It is really odd adapting to being "stupid", not being able to think things through, saying the wrong things from memory, and just basically "giving up" at a certain point in trying to untangle logical problems. Oh, never mind - I'll just go watch TV for a while! )

Michael

Hi Michael

I enjoyed the "aside"...

I've begun thinking about the clock differences between computer and S9 as a source of concern for at least part of the problem. Haven't got far into my investigation yet. I didn't lose the hour and only a few did.

I think you're right that the "1 hour gap" is likely directly related to DST and computer clock vs S9 clock issues.

Nord

Unfortunately I hate to burst the bubble (getting pin ready)



That was the first thing I thought about when I lost the hour worth of data but...
1. It was on a Monday and not on a Sunday and one day later than the UK changed it's clocks (although still pretty close)
2. If the S9 had got caught up in a time zone calamity (which is entirely plausible) then all the graphs would have lost an hours data and not just the Flow graph.

I don't think the missing hour is anything to do with the DST switcharoo, in my tests it seems to be the data skewing gets worse and worse to a point where you then lose an hour on just some of the graphs data. It seemed to be the High Resolution graphs that mostly lost the data and not the Detailed or Summary.

Thanks
Dave

dave21 wrote:Unfortunately I hate to burst the bubble (getting pin ready)



That was the first thing I thought about when I lost the hour worth of data but...
1. It was on a Monday and not on a Sunday and one day later than the UK changed it's clocks (although still pretty close)
2. If the S9 had got caught up in a time zone calamity (which is entirely plausible) then all the graphs would have lost an hours data and not just the Flow graph.

I don't think the missing hour is anything to do with the DST switcharoo, in my tests it seems to be the data skewing gets worse and worse to a point where you then lose an hour on just some of the graphs data. It seemed to be the High Resolution graphs that mostly lost the data and not the Detailed or Summary.

Thanks
Dave

Hi Dave

After searching thru this issue... I really think your computer being on DST correctly and the S9 not being set to the same time is where the computer program becomes "confused"...

What I have found is that Flow is a completely separate upload from the S9 from the other data... that being said... the other data lost 50 minutes in a skewed position. The program may grab it's info for the data input from different sources. If your 2 clocks are set differently... as one other noted on this forum (can't remember who) he couldn't figure out why the machine shut down his input in the middle of his sleep. When the clock was set off by some 5 hours... the time on the graphs looked right to him but the data was spewing out of the S9 at some different times... he thought.

Confusing for you, me and the S9 ... only the computer felt OK.

I am assuming that loss of 1 hour only happened once... the 24 hour period following the time change... when it tried to straighten things out.

Just a thought...
Nord

unadog wrote:My **guess** is that the machine has an older, existing program to accomodate daylight savings time.

Resmed machines know nothing about daylight saving times, you need to adjust times manually to accommodate DST start/finish on all Resmed flow generators made to date.

BTW, a tip for travellers (that I have learned the hard way) - if you intend to change your flow generator time to a new time zone, make the change to the destination time zone immediately after reading the data for your last sleep period in your present location.... especially if you will be crossing the International Date Line.

If your journey gets disrupted and you arrive late/tired at your destination, you can easily forget to do the change on arrival in the new time zone.

Cheers,

Bill

Nord wrote:After searching thru this issue... I really think your computer being on DST correctly and the S9 not being set to the same time is where the computer program becomes "confused"...

What I have found is that Flow is a completely separate upload from the S9 from the other data... that being said... the other data lost 50 minutes in a skewed position. The program may grab it's info for the data input from different sources. If your 2 clocks are set differently... as one other noted on this forum (can't remember who) he couldn't figure out why the machine shut down his input in the middle of his sleep. When the clock was set off by some 5 hours... the time on the graphs looked right to him but the data was spewing out of the S9 at some different times... he thought.

I've been taking a look at the raw data file from the S9 and there is a 1 hour data loss in the actual file, so I don't believe it's a mismatch between the S9 and PC's clock as it's in the raw data file.

Nord wrote:I am assuming that loss of 1 hour only happened once... the 24 hour period following the time change... when it tried to straighten things out.

No it's happened twice for me now, and also for others not around the DST switch change

Is there a setting in the S9 to set the locale, and whether the locale follows DST or not? I didn't find it. I only set the date and time on mine.

manas wrote:Is there a setting in the S9 to set the locale, and whether the locale follows DST or not? I didn't find it. I only set the date and time on mine.

There is no such setting.

Does this mean all S9 users are setting their S9 clocks twice a year? I got mine after Daylight Savings started, but some folks on the board must have got it before.

Yes, unfortunately most machines still don't have daylight saving clock adjustments (you'd think in the current year they would now have them as most computers and mobile devices have them). So unfortunately yes you will need to change the clock on the S9 twice a year.

Thanks
Dave

dave21 wrote:Yes, unfortunately most machines still don't have daylight saving clock adjustments

Its not at all unfortunate, considering the complexity of time zone changes world wide, and they way they get jerked around for mostly politcal reasons.

Cheers,

Bill

There sure is a lot of complexity out there, including the somewhat recent change (2 years ago?) for the US changing their time to summer even earlier and messing up all PC's running Microsoft Operating Systems.

However, that said, most countries have a a time source that updates over the airwaves, most digital watches now days (decent ones) automatically update, clocks update in our new cars without the need to change them. There doesn't have to be an internet connection present to connect to a time server, most can do it over the air, so it would be great if CPAP manufacturers were to add that technology into the machines as the machines themselves are cutting edge technology.

If it's done right then it should work pretty well and not cost the earth to do