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From: david on 13 Apr 2008 11:58
On Sat, 12 Apr 2008 09:27:19 -0700, Joerg rearranged some electrons to
say:

> david wrote:
>> On Fri, 11 Apr 2008 13:39:07 -0700, Julian Vrieslander rearranged some
>> electrons to say:
>>
>>> I'm looking for a simple data acquisition interface that will run on a
>>> Linux PC (Fedora Core 6). The requirements are very simple: 24 bits
>>> of digital output. We need to be able to flip single bits or groups
>>> of bits without causing glitches on unchanged bits. Data rate is slow
>>> - maybe one write every 2 milliseconds.
>>>
>>> Google shows that there are some simple USB-based DAQ interfaces that
>>> might work for this application. I'm wondering if anyone here can
>>> recommend a particular vendor. It would be nice if the product comes
>>> with end-user support and easy-to-understand documentation, since the
>>> people who will be installing and maintaining this system are
>>> biologists, not computer geeks.
>>
>> National Instruments makes good-quality hardware, and excellent
>> software support.
>
>
> And it helps to have a bank account similar to Rockefeller's ...

If one doesn't have, or can't afford, a staff of programmers, then buying
something that works out of the box and reducing your development costs
has to be traded against buying cheap hardware with no software support.
Most people aren't doing projects for free these days.
From: Joerg on 13 Apr 2008 12:04
david wrote:
> On Sat, 12 Apr 2008 09:27:19 -0700, Joerg rearranged some electrons to
> say:
>
>> david wrote:
>>> On Fri, 11 Apr 2008 13:39:07 -0700, Julian Vrieslander rearranged some
>>> electrons to say:
>>>
>>>> I'm looking for a simple data acquisition interface that will run on a
>>>> Linux PC (Fedora Core 6). The requirements are very simple: 24 bits
>>>> of digital output. We need to be able to flip single bits or groups
>>>> of bits without causing glitches on unchanged bits. Data rate is slow
>>>> - maybe one write every 2 milliseconds.
>>>>
>>>> Google shows that there are some simple USB-based DAQ interfaces that
>>>> might work for this application. I'm wondering if anyone here can
>>>> recommend a particular vendor. It would be nice if the product comes
>>>> with end-user support and easy-to-understand documentation, since the
>>>> people who will be installing and maintaining this system are
>>>> biologists, not computer geeks.
>>> National Instruments makes good-quality hardware, and excellent
>>> software support.
>>
>> And it helps to have a bank account similar to Rockefeller's ...
>
> If one doesn't have, or can't afford, a staff of programmers, then buying
> something that works out of the box and reducing your development costs
> has to be traded against buying cheap hardware with no software support.
> Most people aren't doing projects for free these days.


Well, the Labjack cost us $99 per device. Support is free and via a
forum where (so far) I had the answers almost immediately. They seem to
have that forum interface on their desktops all day long. There even is
a special forum for Linux users.

--
Regards, Joerg

http://www.analogconsultants.com/

"gmail" domain blocked because of excessive spam.
Use another domain or send PM.
From: Spehro Pefhany on 13 Apr 2008 13:46
On Fri, 11 Apr 2008 13:39:07 -0700, the renowned Julian Vrieslander
<julianvREMOVE_THIS_PART(a)u.washington.edu> wrote:

>I'm looking for a simple data acquisition interface that will run on a
>Linux PC (Fedora Core 6). The requirements are very simple: 24 bits of
>digital output. We need to be able to flip single bits or groups of
>bits without causing glitches on unchanged bits. Data rate is slow -
>maybe one write every 2 milliseconds.
>
>Google shows that there are some simple USB-based DAQ interfaces that
>might work for this application. I'm wondering if anyone here can
>recommend a particular vendor. It would be nice if the product comes
>with end-user support and easy-to-understand documentation, since the
>people who will be installing and maintaining this system are
>biologists, not computer geeks.

Why USB? Ethernet has a lot of advantages..


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff(a)interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
From: Joerg on 13 Apr 2008 17:45
Spehro Pefhany wrote:
> On Fri, 11 Apr 2008 13:39:07 -0700, the renowned Julian Vrieslander
> <julianvREMOVE_THIS_PART(a)u.washington.edu> wrote:
>
>> I'm looking for a simple data acquisition interface that will run on a
>> Linux PC (Fedora Core 6). The requirements are very simple: 24 bits of
>> digital output. We need to be able to flip single bits or groups of
>> bits without causing glitches on unchanged bits. Data rate is slow -
>> maybe one write every 2 milliseconds.
>>
>> Google shows that there are some simple USB-based DAQ interfaces that
>> might work for this application. I'm wondering if anyone here can
>> recommend a particular vendor. It would be nice if the product comes
>> with end-user support and easy-to-understand documentation, since the
>> people who will be installing and maintaining this system are
>> biologists, not computer geeks.
>
> Why USB? Ethernet has a lot of advantages..
>

Gets a lot more expensive though. But it's a good point, you can even
buy a LabJack for LAN connection. However, then they are north of $400.

--
Regards, Joerg

http://www.analogconsultants.com/

"gmail" domain blocked because of excessive spam.
Use another domain or send PM.
From: Frank Buss on 13 Apr 2008 17:58
Joerg wrote:

> Gets a lot more expensive though. But it's a good point, you can even
> buy a LabJack for LAN connection. However, then they are north of $400.

Why is it that expensive? There are nice small modules with integrated ADCs
and ethernet for $67 :

http://www.emacinc.com/som/somne64.htm

Mounted in a box, it shouldn't cost more than $100.

--
Frank Buss, fb(a)frank-buss.de
http://www.frank-buss.de, http://www.it4-systems.de
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