USB-to-Serial adapter for the Respironics 920M
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USB-to-Serial adapter for the Respironics 920M
Has anyone found a USB-to-Serial adapter that works with the 920M or similar pulse-oximeters? The problem is the 920M outputs TTL levels, whereas all of the adapters I've tried require true RS-232 levels.
a lot of those adapters are made for PDA's like the Belkin and not truly RS-232 devices. I found that out the hard way buying 2 of those Belkin duds, both worthless. The ONLY one I found that actually worked was the I/O Concepts adapter from CompUSA ($29.95). Best Buy may also carry it, I/O Concepts also makes those KVM switches. It is in a Kawasaki green package, adapter is transparent and only says I/O on the sticker on the side of the unit.
You have to install the device driver then use Device Manager to "assign" a COMx: port to it. You want to try and assign one of the main COM ports such as 1-4, if it automatically assigns a COM: port to the driver it may assign COM15: and the device wanting it use it may not find it that high. You can reassign the COMx: port with Device Manager.
Right Click My Computer, then Manage, then Device Manager, find the driver, right click and assign port.
You have to install the device driver then use Device Manager to "assign" a COMx: port to it. You want to try and assign one of the main COM ports such as 1-4, if it automatically assigns a COM: port to the driver it may assign COM15: and the device wanting it use it may not find it that high. You can reassign the COMx: port with Device Manager.
Right Click My Computer, then Manage, then Device Manager, find the driver, right click and assign port.
Thank you for the quick reply. You can add Zonet to your list of adapters that don't work. I'll give the I/O concepts adapter a try.Snoredog wrote:a lot of those adapters are made for PDA's like the Belkin and not truly RS-232 devices. I found that out the hard way buying 2 of those Belkin duds, both worthless. The ONLY one I found that actually worked was the I/O Concepts adapter from CompUSA ($29.95).... .
Please give me the P/N of the I/O concepts USB-to-Serial adapter. I called CompUSA and they said they didn't stock this item. With the P/N I can do a web search.Snoredog wrote:a lot of those adapters are made for PDA's like the Belkin and not truly RS-232 devices. I found that out the hard way buying 2 of those Belkin duds, both worthless. The ONLY one I found that actually worked was the I/O Concepts adapter from CompUSA ($29.95).
Thanks...
Sorry, it was "iConcepts" not I/O Concepts.
Believe it or not I have it in my hand, there is NO part number on the thing. It is a clear braided USB cable about 12" long and has "blue" transparent ends on it. The sticker on each side only says "iConcepts". Looks like it is made by Sakar International.
CompUSA shows it in this packaging:
http://www.compusa.com/products/product ... SB_Adapter
Note: I don't recall mine saying "PDA" because this adapter was my 3rd one I had purchased and didn't want anything to do with a PDA adapter. I wanted a RS-232 Serial port. This one specifically said RS-232 which means it SHOULD comply with standards for RS-232.
Looking through the plastic, this adapter has a small printed circuit board inside which looks like a PL-8259 chip to me.
I've used it with my Sony S-260, Toshiba M55, Toshiba 2435. Yep, I have a few laptops. All have XP SP2 either Home or Pro edition.
I used it with my PB420 and Silverlining when I had it to download data.
Note: the serial adapter gets its power to run from the USB port. Power delivery from the USB port is measured in "ma" millamps. You want to make sure you plug it into a main port and NOT a hub. I also think this adapter is only 1.1 USB compliant. I recall running mine at 9600N81 and it was plenty fast for download. Against my own advice, I have it plugged into a D-Link USB Hub and the hub into a Sony docking station for the S-260 Laptop and it works fine.
I also used this same adapter with my Resmed Spirit and AutoScan software and it worked fine.
But I know you can run into problems with certain brands of adapters, personally I wouldn't give you $25 cents for a Belkin anything.
Here is another one I would try made by Targus. I've had pretty good luck with Targus stuff performing as advertised, think Best-Buy carries Targus laptop accessories. This Targus adapter specifically says RS-232, so it should comply with the standards:
http://www.targus.com/us/product_details.asp?sku=PA088U
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CPAPopedia Keywords Contained In This Post (Click For Definition): resmed, Power
Believe it or not I have it in my hand, there is NO part number on the thing. It is a clear braided USB cable about 12" long and has "blue" transparent ends on it. The sticker on each side only says "iConcepts". Looks like it is made by Sakar International.
CompUSA shows it in this packaging:
http://www.compusa.com/products/product ... SB_Adapter
Note: I don't recall mine saying "PDA" because this adapter was my 3rd one I had purchased and didn't want anything to do with a PDA adapter. I wanted a RS-232 Serial port. This one specifically said RS-232 which means it SHOULD comply with standards for RS-232.
Looking through the plastic, this adapter has a small printed circuit board inside which looks like a PL-8259 chip to me.
I've used it with my Sony S-260, Toshiba M55, Toshiba 2435. Yep, I have a few laptops. All have XP SP2 either Home or Pro edition.
I used it with my PB420 and Silverlining when I had it to download data.
Note: the serial adapter gets its power to run from the USB port. Power delivery from the USB port is measured in "ma" millamps. You want to make sure you plug it into a main port and NOT a hub. I also think this adapter is only 1.1 USB compliant. I recall running mine at 9600N81 and it was plenty fast for download. Against my own advice, I have it plugged into a D-Link USB Hub and the hub into a Sony docking station for the S-260 Laptop and it works fine.
I also used this same adapter with my Resmed Spirit and AutoScan software and it worked fine.
But I know you can run into problems with certain brands of adapters, personally I wouldn't give you $25 cents for a Belkin anything.
Here is another one I would try made by Targus. I've had pretty good luck with Targus stuff performing as advertised, think Best-Buy carries Targus laptop accessories. This Targus adapter specifically says RS-232, so it should comply with the standards:
http://www.targus.com/us/product_details.asp?sku=PA088U
_________________
CPAPopedia Keywords Contained In This Post (Click For Definition): resmed, Power
5 posts
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