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<== Date ==> <== Thread ==>

Subject: RE: USB ADC/DACs
From: "Pawel Kowalski - BiRa Systems Inc." <pawel@bira.com>
To: "'Eric Norum'" <eric@norum.ca>
Cc: tech-talk@aps.anl.gov
Date: Wed, 5 May 2010 10:37:11 -0600

Thank you Eric,

 

The reason I want to do USB is so that I can connect it directly to a mini linux computer without needing an additional Ethernet port. Then this mini pc will have epics IOC running on it which will interface to the USB DAC/ADC and can then be accessed over Ethernet using process variables.

 

The link you sent looks interesting but I think 0-10V would be better since that’s the standard a number of power supplies seem to use. Any other suggestions would be appreciated.

 

------------------------------------

 

Pawel Kowalski

BiRa Systems Inc.

www.bira.com

 

Phone:                   505-881-8887

Fax:                       505-888-0651

 

Address:                2410 Midtown PL NE

STE A

Albuquerque NM 87107 USA

 

From: Eric Norum [mailto:eric@norum.ca]
Sent: Wednesday, May 05, 2010 10:10 AM
To: Pawel Kowalski - BiRa Systems Inc.
Cc: tech-talk@aps.anl.gov
Subject: Re: USB ADC/DACs

 

I'm surprised that you're hearing more requests for USB connections than for ethernet.  The latter allows for much longer connections and is better supported by EPICS/ASYN.

 

In any case, a small PLC sounds like it would take care of this just fine.

 

How about something like (only 0 to 5V, but perhaps that's good enough):

Adding an FTDI USB/Serial adapter adds about $20.00

 

There are small PLCs in this price range with Ethernet, too.

 

 

On May 5, 2010, at 8:35 AM, Pawel Kowalski - BiRa Systems Inc. wrote:



Hello,

 

Based on feedback I got at the beam and instrumentation workshop this week I am trying to come up with a simple and cheap design to control analog power supplies. Nothing is set in stone and I just want to find what we would need to get to make this controller. I am trying to find a DAC/ADC that can be connected using USB to a soft-ioc running linux. I don’t need a lot of channels, 1 analog in and 1 analog out would be fine (2 of each would be preferred) and having a couple digital in/digital out channels would be nice too (but not required). The voltage will be 0-10V (if a bipolar DAC/ADC is available that would be great). I would probably need to have at least 16 bits of resolution on the DAC/ADC. The speed doesn’t have to be terribly fast from what I gathered. Cost is an issue (trying to stay under $200) but if something is out there that costs more than this I would like to take a look at it anyway.

 

I wonder if anyone in the epics community has worked with such a device and if they have epics drivers available. If epics drivers aren’t available I can probably configure something myself using ASYN if someone can point me to a good reliable device. Any suggestions would be greatly appreciated, thank you.

 

------------------------------------

 

Pawel Kowalski

BiRa Systems Inc.

 

Phone:                   505-881-8887

Fax:                       505-888-0651

 

Address:                2410 Midtown PL NE

STE A

Albuquerque NM 87107 USA

 

 

-- 
Eric Norum
eric@norum.ca


 


Replies:
RE: USB ADC/DACs ulrik.pedersen
References:
USB ADC/DACs Pawel Kowalski - BiRa Systems Inc.
Re: USB ADC/DACs Eric Norum

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